[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 8:36 PM Maxime Ripard wrote: > > On Mon, Nov 22, 2021 at 08:01:47PM +0530, Jagan Teki wrote: > > On Mon, Nov 22, 2021 at 7:39 PM Maxime Ripard wrote: > > > > > > On Mon, Nov 22, 2021 at 07:21:57PM +0530, Jagan Teki wrote: > > > > > It's perfectly valid to dereference the pointer in atomic_enable, and > > > > > that patch would consume memory for no particular reason. > > > > > > > > Again, I'm not pointing any mistake in dereference and certainly not > > > > understand about what memory consumption issue here. > > > > > > You add a struct drm_display_mode field to struct sun6i_dsi. It > > > increases the size of struct sun6i_dsi of sizeof(struct > > > drm_display_mode). > > > > > > > I'm doing it here since I'm doing it via mode_set in other drivers. No > > > > problem for me either way. > > > > > > But *why* are you doing so? > > > > > > There might be a valid reason in other drivers, but there's none here > > > (that you mentioned at least). > > > > The reason is to use existing bridge function instead of dereference > > ie what I've mentioned. I don't have any other reasons. > > This discussion is going in circles. Unless you have a reason other than > "because we can", NAK for the reasons already stated above. Agreed your point. Thanks, Jagan. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAMty3ZAm1%2BUyFXGpO0vuJyGbE-P58EErA%2BBgWYXWzu2b9vVr7A%40mail.gmail.com.
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 08:01:47PM +0530, Jagan Teki wrote: > On Mon, Nov 22, 2021 at 7:39 PM Maxime Ripard wrote: > > > > On Mon, Nov 22, 2021 at 07:21:57PM +0530, Jagan Teki wrote: > > > > It's perfectly valid to dereference the pointer in atomic_enable, and > > > > that patch would consume memory for no particular reason. > > > > > > Again, I'm not pointing any mistake in dereference and certainly not > > > understand about what memory consumption issue here. > > > > You add a struct drm_display_mode field to struct sun6i_dsi. It > > increases the size of struct sun6i_dsi of sizeof(struct > > drm_display_mode). > > > > > I'm doing it here since I'm doing it via mode_set in other drivers. No > > > problem for me either way. > > > > But *why* are you doing so? > > > > There might be a valid reason in other drivers, but there's none here > > (that you mentioned at least). > > The reason is to use existing bridge function instead of dereference > ie what I've mentioned. I don't have any other reasons. This discussion is going in circles. Unless you have a reason other than "because we can", NAK for the reasons already stated above. Maxime -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20211122150610.mvltgil3yquli4qp%40gilmour.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
On Mon, Nov 22, 2021 at 07:49:26PM +0530, Jagan Teki wrote:
> On Mon, Nov 22, 2021 at 7:35 PM Maxime Ripard wrote:
> > On Mon, Nov 22, 2021 at 07:18:13PM +0530, Jagan Teki wrote:
> > > On Mon, Nov 22, 2021 at 3:37 PM Maxime Ripard wrote:
> > > >
> > > > On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> > > > > Some display panels would come up with a non-DSI output, those
> > > > > can have an option to connect the DSI host by means of interface
> > > > > bridge converter.
> > > > >
> > > > > This DSI to non-DSI interface bridge converter would requires
> > > > > DSI Host to handle drm bridge functionalities in order to DSI
> > > > > Host to Interface bridge.
> > > >
> > > > In order to do this you would need to use the DRM bridge API...
> > >
> > > Sorry, which bridge API do you mean?
> >
> > Any variant of of_drm_find_bridge, and drm_bridge_attach. Just like
> > we're doing in sun4i_rgb.c
>
> Yes, we have drm_bridge_attach in bind and bridge_function.attach
> calls in this patch and of_drm_find_bridge in sun6i_mipi_dsi_attach.
> Not sure which API's I've missed.
None, that's my point, you don't need anything else in order to do what
you wanted to achieve.
> >
> > > > > This patch convert the existing to a drm bridge driver with a
> > > > > built-in encoder support for compatibility with existing
> > > > > component drivers.
> > > >
> > > > ... but changing the encoder driver to a bridge is completely
> > > > unnecessary to do so. Why did you need to make that change?
> > >
> > > Idea of this series is to convert the driver to bridge and use the
> > > latest bridge function from the v1 series.
> >
> > Ok, but it's not at all what you mention in your commit log? You don't
> > need any of that in order to support a bridge downstream.
>
> I've mentioned "Converting to bridge driver" and thought it has
> meaning of converting encoder related function to bridge functions as
> well. Not think about specific description to describe on commit
> message. Will update this.
But you provided no reason to do so. The only one you did mention was
that you wanted to support downstream bridges, but you don't need to
convert the DSI driver to a bridge in order to do that.
> > > > > Signed-off-by: Jagan Teki
> > > > >
> > > > > ---
> > > > > Changes for v5:
> > > > > - add atomic APIs
> > > > > - find host and device variant DSI devices.
> > > > > Changes for v4, v3:
> > > > > - none
> > > > >
> > > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112
> > > > > -
> > > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > > > > 2 files changed, 96 insertions(+), 23 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > index 43d9c9e5198d..a6a272b55f77 100644
> > > > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > @@ -21,6 +21,7 @@
> > > > >
> > > > > #include
> > > > > #include
> > > > > +#include
> > > > > #include
> > > > > #include
> > > > > #include
> > > > > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi
> > > > > *dsi,
> > > > > return 0;
> > > > > }
> > > > >
> > > > > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > > > > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > > > > +struct drm_bridge_state
> > > > > *old_bridge_state)
> > > > > {
> > > > > - struct drm_display_mode *mode =
> > > > > >crtc->state->adjusted_mode;
> > > > > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > > > > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > > > > + struct drm_display_mode *mode =
> > > > > >encoder->crtc->state->adjusted_mode;
> > > > > struct mipi_dsi_device *device = dsi->device;
> > > > > union phy_configure_opts opts = { };
> > > > > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > > > > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct
> > > > > drm_encoder *encoder)
> > > > > if (dsi->panel)
> > > > > drm_panel_prepare(dsi->panel);
> > > > >
> > > > > + if (dsi->next_bridge)
> > > > > +
> > > > > dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > > > > old_bridge_state);
> > > > > +
> > > >
> > > > Please use the proper helpers.
> > >
> > > If we use bridge_functions we need to take atomic functions as
> > > precedence as the next bridge functions might convert atomic calls.
> >
> > We've had this discussion over and over again, but this is something
> > that needs to be documented and / or in your commit log.
> >
> > You must not deviate from the standard (and expected) behavior without
> > any kind of justification.
>
> Not exactly sure about what you mean, sorry. All these atomic bridge
> functions are already documented if I'm not wrong and Laurent have
>
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 7:39 PM Maxime Ripard wrote: > > On Mon, Nov 22, 2021 at 07:21:57PM +0530, Jagan Teki wrote: > > > It's perfectly valid to dereference the pointer in atomic_enable, and > > > that patch would consume memory for no particular reason. > > > > Again, I'm not pointing any mistake in dereference and certainly not > > understand about what memory consumption issue here. > > You add a struct drm_display_mode field to struct sun6i_dsi. It > increases the size of struct sun6i_dsi of sizeof(struct > drm_display_mode). > > > I'm doing it here since I'm doing it via mode_set in other drivers. No > > problem for me either way. > > But *why* are you doing so? > > There might be a valid reason in other drivers, but there's none here > (that you mentioned at least). The reason is to use existing bridge function instead of dereference ie what I've mentioned. I don't have any other reasons. Jagan. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAMty3ZBOYRJ5ScrYEKoA9e1hP9%3DyuKuASvXyorB_kLsp26Fe3A%40mail.gmail.com.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
Hi Maxime,
On Mon, Nov 22, 2021 at 7:35 PM Maxime Ripard wrote:
>
> On Mon, Nov 22, 2021 at 07:18:13PM +0530, Jagan Teki wrote:
> > Hi Maxime,
> >
> > On Mon, Nov 22, 2021 at 3:37 PM Maxime Ripard wrote:
> > >
> > > On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> > > > Some display panels would come up with a non-DSI output, those
> > > > can have an option to connect the DSI host by means of interface
> > > > bridge converter.
> > > >
> > > > This DSI to non-DSI interface bridge converter would requires
> > > > DSI Host to handle drm bridge functionalities in order to DSI
> > > > Host to Interface bridge.
> > >
> > > In order to do this you would need to use the DRM bridge API...
> >
> > Sorry, which bridge API do you mean?
>
> Any variant of of_drm_find_bridge, and drm_bridge_attach. Just like
> we're doing in sun4i_rgb.c
Yes, we have drm_bridge_attach in bind and bridge_function.attach
calls in this patch and of_drm_find_bridge in sun6i_mipi_dsi_attach.
Not sure which API's I've missed.
>
> > > > This patch convert the existing to a drm bridge driver with a
> > > > built-in encoder support for compatibility with existing
> > > > component drivers.
> > >
> > > ... but changing the encoder driver to a bridge is completely
> > > unnecessary to do so. Why did you need to make that change?
> >
> > Idea of this series is to convert the driver to bridge and use the
> > latest bridge function from the v1 series.
>
> Ok, but it's not at all what you mention in your commit log? You don't
> need any of that in order to support a bridge downstream.
I've mentioned "Converting to bridge driver" and thought it has
meaning of converting encoder related function to bridge functions as
well. Not think about specific description to describe on commit
message. Will update this.
>
> > >
> > > > Signed-off-by: Jagan Teki
> > > >
> > > > ---
> > > > Changes for v5:
> > > > - add atomic APIs
> > > > - find host and device variant DSI devices.
> > > > Changes for v4, v3:
> > > > - none
> > > >
> > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > > > 2 files changed, 96 insertions(+), 23 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > index 43d9c9e5198d..a6a272b55f77 100644
> > > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > @@ -21,6 +21,7 @@
> > > >
> > > > #include
> > > > #include
> > > > +#include
> > > > #include
> > > > #include
> > > > #include
> > > > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> > > > return 0;
> > > > }
> > > >
> > > > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > > > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > > > +struct drm_bridge_state
> > > > *old_bridge_state)
> > > > {
> > > > - struct drm_display_mode *mode =
> > > > >crtc->state->adjusted_mode;
> > > > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > > > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > > > + struct drm_display_mode *mode =
> > > > >encoder->crtc->state->adjusted_mode;
> > > > struct mipi_dsi_device *device = dsi->device;
> > > > union phy_configure_opts opts = { };
> > > > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > > > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct
> > > > drm_encoder *encoder)
> > > > if (dsi->panel)
> > > > drm_panel_prepare(dsi->panel);
> > > >
> > > > + if (dsi->next_bridge)
> > > > +
> > > > dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > > > old_bridge_state);
> > > > +
> > >
> > > Please use the proper helpers.
> >
> > If we use bridge_functions we need to take atomic functions as
> > precedence as the next bridge functions might convert atomic calls.
>
> We've had this discussion over and over again, but this is something
> that needs to be documented and / or in your commit log.
>
> You must not deviate from the standard (and expected) behavior without
> any kind of justification.
Not exactly sure about what you mean, sorry. All these atomic bridge
functions are already documented if I'm not wrong and Laurent have
patches to switch the normal functions to atomic. Not sure what else
need to document here and need justification for it if the driver is
converting to bridge.
>
> > >
> > > > /*
> > > >* FIXME: This should be moved after the switch to HS mode.
> > > >*
> > > > @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct
> > > > drm_encoder *encoder)
> > > > if (dsi->panel)
> > > > drm_panel_enable(dsi->panel);
> > > >
> > > > + if (dsi->next_bridge)
> > > > +
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 07:21:57PM +0530, Jagan Teki wrote: > > It's perfectly valid to dereference the pointer in atomic_enable, and > > that patch would consume memory for no particular reason. > > Again, I'm not pointing any mistake in dereference and certainly not > understand about what memory consumption issue here. You add a struct drm_display_mode field to struct sun6i_dsi. It increases the size of struct sun6i_dsi of sizeof(struct drm_display_mode). > I'm doing it here since I'm doing it via mode_set in other drivers. No > problem for me either way. But *why* are you doing so? There might be a valid reason in other drivers, but there's none here (that you mentioned at least). Maxime -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20211122140929.22cmvnxxapp752ic%40gilmour.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
On Mon, Nov 22, 2021 at 07:18:13PM +0530, Jagan Teki wrote:
> Hi Maxime,
>
> On Mon, Nov 22, 2021 at 3:37 PM Maxime Ripard wrote:
> >
> > On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> > > Some display panels would come up with a non-DSI output, those
> > > can have an option to connect the DSI host by means of interface
> > > bridge converter.
> > >
> > > This DSI to non-DSI interface bridge converter would requires
> > > DSI Host to handle drm bridge functionalities in order to DSI
> > > Host to Interface bridge.
> >
> > In order to do this you would need to use the DRM bridge API...
>
> Sorry, which bridge API do you mean?
Any variant of of_drm_find_bridge, and drm_bridge_attach. Just like
we're doing in sun4i_rgb.c
> > > This patch convert the existing to a drm bridge driver with a
> > > built-in encoder support for compatibility with existing
> > > component drivers.
> >
> > ... but changing the encoder driver to a bridge is completely
> > unnecessary to do so. Why did you need to make that change?
>
> Idea of this series is to convert the driver to bridge and use the
> latest bridge function from the v1 series.
Ok, but it's not at all what you mention in your commit log? You don't
need any of that in order to support a bridge downstream.
> >
> > > Signed-off-by: Jagan Teki
> > >
> > > ---
> > > Changes for v5:
> > > - add atomic APIs
> > > - find host and device variant DSI devices.
> > > Changes for v4, v3:
> > > - none
> > >
> > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > > 2 files changed, 96 insertions(+), 23 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > index 43d9c9e5198d..a6a272b55f77 100644
> > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > @@ -21,6 +21,7 @@
> > >
> > > #include
> > > #include
> > > +#include
> > > #include
> > > #include
> > > #include
> > > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> > > return 0;
> > > }
> > >
> > > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > > +struct drm_bridge_state
> > > *old_bridge_state)
> > > {
> > > - struct drm_display_mode *mode =
> > > >crtc->state->adjusted_mode;
> > > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > > + struct drm_display_mode *mode =
> > > >encoder->crtc->state->adjusted_mode;
> > > struct mipi_dsi_device *device = dsi->device;
> > > union phy_configure_opts opts = { };
> > > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct
> > > drm_encoder *encoder)
> > > if (dsi->panel)
> > > drm_panel_prepare(dsi->panel);
> > >
> > > + if (dsi->next_bridge)
> > > +
> > > dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > > old_bridge_state);
> > > +
> >
> > Please use the proper helpers.
>
> If we use bridge_functions we need to take atomic functions as
> precedence as the next bridge functions might convert atomic calls.
We've had this discussion over and over again, but this is something
that needs to be documented and / or in your commit log.
You must not deviate from the standard (and expected) behavior without
any kind of justification.
> >
> > > /*
> > >* FIXME: This should be moved after the switch to HS mode.
> > >*
> > > @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct
> > > drm_encoder *encoder)
> > > if (dsi->panel)
> > > drm_panel_enable(dsi->panel);
> > >
> > > + if (dsi->next_bridge)
> > > + dsi->next_bridge->funcs->atomic_enable(dsi->next_bridge,
> > > old_bridge_state);
> > > +
> >
> > Ditto
> >
> > > sun6i_dsi_start(dsi, DSI_START_HSC);
> > >
> > > udelay(1000);
> > > @@ -794,15 +802,19 @@ static void sun6i_dsi_encoder_enable(struct
> > > drm_encoder *encoder)
> > > sun6i_dsi_start(dsi, DSI_START_HSD);
> > > }
> > >
> > > -static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> > > +static void sun6i_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > > + struct drm_bridge_state
> > > *old_bridge_state)
> > > {
> > > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > >
> > > DRM_DEBUG_DRIVER("Disabling DSI output\n");
> > >
> > > if (dsi->panel) {
> > > drm_panel_disable(dsi->panel);
> > > drm_panel_unprepare(dsi->panel);
> > > + } else if (dsi->next_bridge) {
> > > +
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
Hi Maxime, On Mon, Nov 22, 2021 at 6:58 PM Maxime Ripard wrote: > > On Mon, Nov 22, 2021 at 06:35:58PM +0530, Jagan Teki wrote: > > On Mon, Nov 22, 2021 at 3:38 PM Maxime Ripard wrote: > > > > > > On Mon, Nov 22, 2021 at 12:22:20PM +0530, Jagan Teki wrote: > > > > Get the display mode settings via mode_set bridge function > > > > instead of explicitly de-reference. > > > > > > What's wrong with dereferencing the mode? > > > > Nothing wrong with dereferencing, however we have built-in API to that job. > > That's not an API though? May be we can call it bridge or encoding function, I usually call these ops are API's. > > It's perfectly valid to dereference the pointer in atomic_enable, and > that patch would consume memory for no particular reason. Again, I'm not pointing any mistake in dereference and certainly not understand about what memory consumption issue here. I'm doing it here since I'm doing it via mode_set in other drivers. No problem for me either way. Thanks, Jagan. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAMty3ZAzwKtABZqJhVDmgOVpnZFg66z6Bc_pn3Fm9%3D658RPG1g%40mail.gmail.com.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
Hi Maxime,
On Mon, Nov 22, 2021 at 3:37 PM Maxime Ripard wrote:
>
> On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> > Some display panels would come up with a non-DSI output, those
> > can have an option to connect the DSI host by means of interface
> > bridge converter.
> >
> > This DSI to non-DSI interface bridge converter would requires
> > DSI Host to handle drm bridge functionalities in order to DSI
> > Host to Interface bridge.
>
> In order to do this you would need to use the DRM bridge API...
Sorry, which bridge API do you mean?
>
> > This patch convert the existing to a drm bridge driver with a
> > built-in encoder support for compatibility with existing
> > component drivers.
>
> ... but changing the encoder driver to a bridge is completely
> unnecessary to do so. Why did you need to make that change?
Idea of this series is to convert the driver to bridge and use the
latest bridge function from the v1 series.
>
> > Signed-off-by: Jagan Teki
> >
> > ---
> > Changes for v5:
> > - add atomic APIs
> > - find host and device variant DSI devices.
> > Changes for v4, v3:
> > - none
> >
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > 2 files changed, 96 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 43d9c9e5198d..a6a272b55f77 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -21,6 +21,7 @@
> >
> > #include
> > #include
> > +#include
> > #include
> > #include
> > #include
> > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> > return 0;
> > }
> >
> > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > +struct drm_bridge_state
> > *old_bridge_state)
> > {
> > - struct drm_display_mode *mode = >crtc->state->adjusted_mode;
> > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > + struct drm_display_mode *mode =
> > >encoder->crtc->state->adjusted_mode;
> > struct mipi_dsi_device *device = dsi->device;
> > union phy_configure_opts opts = { };
> > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_prepare(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
>
> Please use the proper helpers.
If we use bridge_functions we need to take atomic functions as
precedence as the next bridge functions might convert atomic calls.
>
> > /*
> >* FIXME: This should be moved after the switch to HS mode.
> >*
> > @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_enable(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
>
> Ditto
>
> > sun6i_dsi_start(dsi, DSI_START_HSC);
> >
> > udelay(1000);
> > @@ -794,15 +802,19 @@ static void sun6i_dsi_encoder_enable(struct
> > drm_encoder *encoder)
> > sun6i_dsi_start(dsi, DSI_START_HSD);
> > }
> >
> > -static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> > +static void sun6i_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> > *old_bridge_state)
> > {
> > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> >
> > DRM_DEBUG_DRIVER("Disabling DSI output\n");
> >
> > if (dsi->panel) {
> > drm_panel_disable(dsi->panel);
> > drm_panel_unprepare(dsi->panel);
> > + } else if (dsi->next_bridge) {
> > + dsi->next_bridge->funcs->atomic_disable(dsi->next_bridge,
> > old_bridge_state);
> > +
> > dsi->next_bridge->funcs->atomic_post_disable(dsi->next_bridge,
> > old_bridge_state);
>
> Ditto
>
> > }
> >
> > phy_power_off(dsi->dphy);
> > @@ -842,9 +854,25 @@ static const struct drm_connector_funcs
> > sun6i_dsi_connector_funcs = {
> > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > };
> >
> > -static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
> > - .disable= sun6i_dsi_encoder_disable,
> > - .enable = sun6i_dsi_encoder_enable,
> > +static int sun6i_dsi_bridge_attach(struct drm_bridge *bridge,
> > +enum
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 06:35:58PM +0530, Jagan Teki wrote: > On Mon, Nov 22, 2021 at 3:38 PM Maxime Ripard wrote: > > > > On Mon, Nov 22, 2021 at 12:22:20PM +0530, Jagan Teki wrote: > > > Get the display mode settings via mode_set bridge function > > > instead of explicitly de-reference. > > > > What's wrong with dereferencing the mode? > > Nothing wrong with dereferencing, however we have built-in API to that job. That's not an API though? It's perfectly valid to dereference the pointer in atomic_enable, and that patch would consume memory for no particular reason. Maxime -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20211122132847.ds4gtk2unq3fkagy%40gilmour.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
Hi Neil,
On Mon, Nov 22, 2021 at 6:22 PM Neil Armstrong wrote:
>
> On 22/11/2021 07:52, Jagan Teki wrote:
> > Some display panels would come up with a non-DSI output, those
> > can have an option to connect the DSI host by means of interface
> > bridge converter.
> >
> > This DSI to non-DSI interface bridge converter would requires
> > DSI Host to handle drm bridge functionalities in order to DSI
> > Host to Interface bridge.
> >
> > This patch convert the existing to a drm bridge driver with a
> > built-in encoder support for compatibility with existing
> > component drivers.
> >
> > Signed-off-by: Jagan Teki
> > ---
> > Changes for v5:
> > - add atomic APIs
> > - find host and device variant DSI devices.
> > Changes for v4, v3:
> > - none
> >
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > 2 files changed, 96 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 43d9c9e5198d..a6a272b55f77 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -21,6 +21,7 @@
> >
> > #include
> > #include
> > +#include
> > #include
> > #include
> > #include
> > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> > return 0;
> > }
> >
> > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > +struct drm_bridge_state
> > *old_bridge_state)
> > {
> > - struct drm_display_mode *mode = >crtc->state->adjusted_mode;
> > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > + struct drm_display_mode *mode =
> > >encoder->crtc->state->adjusted_mode;
> > struct mipi_dsi_device *device = dsi->device;
> > union phy_configure_opts opts = { };
> > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_prepare(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
> > /*
> >* FIXME: This should be moved after the switch to HS mode.
> >*
> > @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_enable(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
>
>
> No need to call the next bridge atomic pre_enable/enable/disable/post_disable
> since they will
> be called automatically on the bridge chain.
Correct, but the existing bridge chain (stack) is not compatible with
sun6i DSI start sequence. We cannot send any DCS once we start HS
mode.
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c#n775
This specific problem can be fixed only if we change the bridge chain
from stack to queue. Please check this series
https://patchwork.kernel.org/project/dri-devel/patch/20210214194102.126146-6-ja...@amarulasolutions.com/
Jagan.
--
You received this message because you are subscribed to the Google Groups
"linux-sunxi" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to linux-sunxi+unsubscr...@googlegroups.com.
To view this discussion on the web, visit
https://groups.google.com/d/msgid/linux-sunxi/CAMty3ZDATTKoJq7aLOe5i%3DRPo2UHzqnLs8j8sT-EBNdpC7%3D3DQ%40mail.gmail.com.
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 3:38 PM Maxime Ripard wrote: > > On Mon, Nov 22, 2021 at 12:22:20PM +0530, Jagan Teki wrote: > > Get the display mode settings via mode_set bridge function > > instead of explicitly de-reference. > > What's wrong with dereferencing the mode? Nothing wrong with dereferencing, however we have built-in API to that job. Jagan. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/CAMty3ZDDQR-OkjqEfb1ZYZG%2BoLN2ZOv-2GLxs3AdeDHqUD8fjQ%40mail.gmail.com.
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
Hi Maxime,
On Mon, Nov 22, 2021 at 11:07:12AM +0100, Maxime Ripard wrote:
> On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> > Some display panels would come up with a non-DSI output, those
> > can have an option to connect the DSI host by means of interface
> > bridge converter.
> >
> > This DSI to non-DSI interface bridge converter would requires
> > DSI Host to handle drm bridge functionalities in order to DSI
> > Host to Interface bridge.
>
> In order to do this you would need to use the DRM bridge API...
>
> > This patch convert the existing to a drm bridge driver with a
> > built-in encoder support for compatibility with existing
> > component drivers.
>
> ... but changing the encoder driver to a bridge is completely
> unnecessary to do so. Why did you need to make that change?
>
> > Signed-off-by: Jagan Teki
> >
> > ---
> > Changes for v5:
> > - add atomic APIs
> > - find host and device variant DSI devices.
> > Changes for v4, v3:
> > - none
> >
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> > 2 files changed, 96 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 43d9c9e5198d..a6a272b55f77 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -21,6 +21,7 @@
> >
> > #include
> > #include
> > +#include
> > #include
> > #include
> > #include
> > @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> > return 0;
> > }
> >
> > -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> > *old_bridge_state)
> > {
> > - struct drm_display_mode *mode = >crtc->state->adjusted_mode;
> > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> > + struct drm_display_mode *mode =
> > >encoder->crtc->state->adjusted_mode;
> > struct mipi_dsi_device *device = dsi->device;
> > union phy_configure_opts opts = { };
> > struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> > @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_prepare(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
>
> Please use the proper helpers.
I don't know about this series in particular, but overall we try to move
encoders to bridge drivers in order to standardize on a single API. The
drm_encoder can't be removed as it's exposed to userspace, so it then
becomes a dumb encoder, without any operation implemented.
> > /*
> > * FIXME: This should be moved after the switch to HS mode.
> > *
> > @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> > *encoder)
> > if (dsi->panel)
> > drm_panel_enable(dsi->panel);
> >
> > + if (dsi->next_bridge)
> > + dsi->next_bridge->funcs->atomic_enable(dsi->next_bridge,
> > old_bridge_state);
> > +
>
> Ditto
>
> > sun6i_dsi_start(dsi, DSI_START_HSC);
> >
> > udelay(1000);
> > @@ -794,15 +802,19 @@ static void sun6i_dsi_encoder_enable(struct
> > drm_encoder *encoder)
> > sun6i_dsi_start(dsi, DSI_START_HSD);
> > }
> >
> > -static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> > +static void sun6i_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> > *old_bridge_state)
> > {
> > - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> > + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> >
> > DRM_DEBUG_DRIVER("Disabling DSI output\n");
> >
> > if (dsi->panel) {
> > drm_panel_disable(dsi->panel);
> > drm_panel_unprepare(dsi->panel);
> > + } else if (dsi->next_bridge) {
> > + dsi->next_bridge->funcs->atomic_disable(dsi->next_bridge,
> > old_bridge_state);
> > + dsi->next_bridge->funcs->atomic_post_disable(dsi->next_bridge,
> > old_bridge_state);
>
> Ditto
>
> > }
> >
> > phy_power_off(dsi->dphy);
> > @@ -842,9 +854,25 @@ static const struct drm_connector_funcs
> > sun6i_dsi_connector_funcs = {
> > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > };
> >
> > -static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
> > - .disable= sun6i_dsi_encoder_disable,
> > - .enable = sun6i_dsi_encoder_enable,
> > +static int sun6i_dsi_bridge_attach(struct drm_bridge *bridge,
> > + enum drm_bridge_attach_flags flags)
> > +{
> > + struct sun6i_dsi *dsi =
[linux-sunxi] Re: [PATCH v5 4/7] drm: sun4i: dsi: Add mode_set function
On Mon, Nov 22, 2021 at 12:22:20PM +0530, Jagan Teki wrote: > Get the display mode settings via mode_set bridge function > instead of explicitly de-reference. What's wrong with dereferencing the mode? Maxime -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20211122100759.qw6lvwb33ciemg2y%40gilmour. signature.asc Description: PGP signature
[linux-sunxi] Re: [PATCH v5 3/7] drm: sun4i: dsi: Convert to bridge driver
On Mon, Nov 22, 2021 at 12:22:19PM +0530, Jagan Teki wrote:
> Some display panels would come up with a non-DSI output, those
> can have an option to connect the DSI host by means of interface
> bridge converter.
>
> This DSI to non-DSI interface bridge converter would requires
> DSI Host to handle drm bridge functionalities in order to DSI
> Host to Interface bridge.
In order to do this you would need to use the DRM bridge API...
> This patch convert the existing to a drm bridge driver with a
> built-in encoder support for compatibility with existing
> component drivers.
... but changing the encoder driver to a bridge is completely
unnecessary to do so. Why did you need to make that change?
> Signed-off-by: Jagan Teki
>
> ---
> Changes for v5:
> - add atomic APIs
> - find host and device variant DSI devices.
> Changes for v4, v3:
> - none
>
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 112 -
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 7 ++
> 2 files changed, 96 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index 43d9c9e5198d..a6a272b55f77 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -21,6 +21,7 @@
>
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -713,10 +714,11 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> return 0;
> }
>
> -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> +static void sun6i_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> +struct drm_bridge_state
> *old_bridge_state)
> {
> - struct drm_display_mode *mode = >crtc->state->adjusted_mode;
> - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> + struct drm_display_mode *mode =
> >encoder->crtc->state->adjusted_mode;
> struct mipi_dsi_device *device = dsi->device;
> union phy_configure_opts opts = { };
> struct phy_configure_opts_mipi_dphy *cfg = _dphy;
> @@ -772,6 +774,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> *encoder)
> if (dsi->panel)
> drm_panel_prepare(dsi->panel);
>
> + if (dsi->next_bridge)
> + dsi->next_bridge->funcs->atomic_pre_enable(dsi->next_bridge,
> old_bridge_state);
> +
Please use the proper helpers.
> /*
>* FIXME: This should be moved after the switch to HS mode.
>*
> @@ -787,6 +792,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> *encoder)
> if (dsi->panel)
> drm_panel_enable(dsi->panel);
>
> + if (dsi->next_bridge)
> + dsi->next_bridge->funcs->atomic_enable(dsi->next_bridge,
> old_bridge_state);
> +
Ditto
> sun6i_dsi_start(dsi, DSI_START_HSC);
>
> udelay(1000);
> @@ -794,15 +802,19 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder
> *encoder)
> sun6i_dsi_start(dsi, DSI_START_HSD);
> }
>
> -static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> +static void sun6i_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> + struct drm_bridge_state
> *old_bridge_state)
> {
> - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
>
> DRM_DEBUG_DRIVER("Disabling DSI output\n");
>
> if (dsi->panel) {
> drm_panel_disable(dsi->panel);
> drm_panel_unprepare(dsi->panel);
> + } else if (dsi->next_bridge) {
> + dsi->next_bridge->funcs->atomic_disable(dsi->next_bridge,
> old_bridge_state);
> + dsi->next_bridge->funcs->atomic_post_disable(dsi->next_bridge,
> old_bridge_state);
Ditto
> }
>
> phy_power_off(dsi->dphy);
> @@ -842,9 +854,25 @@ static const struct drm_connector_funcs
> sun6i_dsi_connector_funcs = {
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> -static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
> - .disable= sun6i_dsi_encoder_disable,
> - .enable = sun6i_dsi_encoder_enable,
> +static int sun6i_dsi_bridge_attach(struct drm_bridge *bridge,
> +enum drm_bridge_attach_flags flags)
> +{
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> +
> + if (dsi->next_bridge)
> + return drm_bridge_attach(bridge->encoder, dsi->next_bridge,
> + NULL, 0);
> +
> + return 0;
> +}
> +
> +static const struct drm_bridge_funcs sun6i_dsi_bridge_funcs = {
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_enable
