Re: [PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
On Fri, 13 Jan 2023, Dmitry Baryshkov wrote:
> On Fri, 13 Jan 2023 at 09:12, Laurentiu Palcu
> wrote:
>>
>> Hi Dmitry,
>>
>> On Thu, Jan 12, 2023 at 05:42:47PM +0200, Dmitry Baryshkov wrote:
>> > There are two flags attemting to guard connector polling:
>> > poll_enabled and poll_running. While poll_enabled semantics is clearly
>> > defined and fully adhered (mark that drm_kms_helper_poll_init() was
>> > called and not finalized by the _fini() call), the poll_running flag
>> > doesn't have such clearliness.
>> >
>> > This flag is used only in drm_helper_probe_single_connector_modes() to
>> > guard calling of drm_kms_helper_poll_enable, it doesn't guard the
>> > drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
>> > is actually running. Tie HPD enablement to this flag.
>> >
>> > This fix the following warning reported after merging the HPD series:
>>
>> s/fix/fixes/
>>
>> >
>> > Hot plug detection already enabled
>> > WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
>> > drm_bridge_hpd_enable+0x94/0x9c [drm]
>> > Modules linked in: videobuf2_memops snd_soc_simple_card
>> > snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common
>> > snd_soc_imx_spdif adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
>> > CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578
>> > #6
>> > Hardware name: NXP i.MX8MQ EVK (DT)
>> > Workqueue: events_unbound deferred_probe_work_func
>> > pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>> > pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
>> > lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
>> > sp : 89ef3740
>> > x29: 89ef3740 x28: 09331f00 x27: 1000
>> > x26: 0020 x25: 81148ed8 x24: 0a8fe000
>> > x23: fffd x22: 05086348 x21: 81133ee0
>> > x20: 0550d800 x19: 05086288 x18: 0006
>> > x17: x16: 896ef008 x15: 972891004260
>> > x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
>> > x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
>> > x8 : 00250b00 x7 : 0003 x6 : 0011
>> > x5 : x4 : bd986a48 x3 : 0001
>> > x2 : x1 : x0 : 0025
>> > Call trace:
>> > drm_bridge_hpd_enable+0x94/0x9c [drm]
>> > drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
>> > drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
>> > drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
>> > drm_client_modeset_probe+0x204/0x1190 [drm]
>> > __drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
>> > drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
>> > drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
>> > drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
>> > dcss_kms_attach+0x1c8/0x254 [imx_dcss]
>> > dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
>> > platform_probe+0x70/0xcc
>> > really_probe+0xc4/0x2e0
>> > __driver_probe_device+0x80/0xf0
>> > driver_probe_device+0xe0/0x164
>> > __device_attach_driver+0xc0/0x13c
>> > bus_for_each_drv+0x84/0xe0
>> > __device_attach+0xa4/0x1a0
>> > device_initial_probe+0x1c/0x30
>> > bus_probe_device+0xa4/0xb0
>> > deferred_probe_work_func+0x90/0xd0
>> > process_one_work+0x200/0x474
>> > worker_thread+0x74/0x43c
>> > kthread+0xfc/0x110
>> > ret_from_fork+0x10/0x20
>> > ---[ end trace ]---
>> >
>> > Reported-by: Laurentiu Palcu
>> > Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on
>> > connectors")
>> > Signed-off-by: Dmitry Baryshkov
>> > ---
>> > drivers/gpu/drm/drm_probe_helper.c | 110 +
>> > 1 file changed, 63 insertions(+), 47 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/drm_probe_helper.c
>> > b/drivers/gpu/drm/drm_probe_helper.c
>> > index 7973f2589ced..ef919d95fea6 100644
>> > --- a/drivers/gpu/drm/drm_probe_helper.c
>> > +++ b/drivers/gpu/drm/drm_probe_helper.c
>> > @@ -222,6 +222,45 @@ drm_connector_mode_valid(struct drm_connector
>> > *connector,
>> > return ret;
>> > }
>> >
>> > +static void drm_kms_helper_disable_hpd(struct drm_device *dev)
>> > +{
>> > + struct drm_connector *connector;
>> > + struct drm_connector_list_iter conn_iter;
>> > +
>> > + drm_connector_list_iter_begin(dev, _iter);
>> > + drm_for_each_connector_iter(connector, _iter) {
>> > + const struct drm_connector_helper_funcs *funcs =
>> > + connector->helper_private;
>> > +
>> > + if (funcs && funcs->disable_hpd)
>> > + funcs->disable_hpd(connector);
>> > + }
>> > + drm_connector_list_iter_end(_iter);
>> > +}
>> > +
>> > +static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
>> > +{
>> > + bool poll = false;
>> > + struct drm_connector *connector;
>> > + struct
Re: [PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
On Fri, 13 Jan 2023 at 09:12, Laurentiu Palcu
wrote:
>
> Hi Dmitry,
>
> On Thu, Jan 12, 2023 at 05:42:47PM +0200, Dmitry Baryshkov wrote:
> > There are two flags attemting to guard connector polling:
> > poll_enabled and poll_running. While poll_enabled semantics is clearly
> > defined and fully adhered (mark that drm_kms_helper_poll_init() was
> > called and not finalized by the _fini() call), the poll_running flag
> > doesn't have such clearliness.
> >
> > This flag is used only in drm_helper_probe_single_connector_modes() to
> > guard calling of drm_kms_helper_poll_enable, it doesn't guard the
> > drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
> > is actually running. Tie HPD enablement to this flag.
> >
> > This fix the following warning reported after merging the HPD series:
>
> s/fix/fixes/
>
> >
> > Hot plug detection already enabled
> > WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
> > drm_bridge_hpd_enable+0x94/0x9c [drm]
> > Modules linked in: videobuf2_memops snd_soc_simple_card
> > snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common
> > snd_soc_imx_spdif adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
> > CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578
> > #6
> > Hardware name: NXP i.MX8MQ EVK (DT)
> > Workqueue: events_unbound deferred_probe_work_func
> > pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
> > lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
> > sp : 89ef3740
> > x29: 89ef3740 x28: 09331f00 x27: 1000
> > x26: 0020 x25: 81148ed8 x24: 0a8fe000
> > x23: fffd x22: 05086348 x21: 81133ee0
> > x20: 0550d800 x19: 05086288 x18: 0006
> > x17: x16: 896ef008 x15: 972891004260
> > x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
> > x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
> > x8 : 00250b00 x7 : 0003 x6 : 0011
> > x5 : x4 : bd986a48 x3 : 0001
> > x2 : x1 : x0 : 0025
> > Call trace:
> > drm_bridge_hpd_enable+0x94/0x9c [drm]
> > drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
> > drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
> > drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
> > drm_client_modeset_probe+0x204/0x1190 [drm]
> > __drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
> > drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
> > drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
> > drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
> > dcss_kms_attach+0x1c8/0x254 [imx_dcss]
> > dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
> > platform_probe+0x70/0xcc
> > really_probe+0xc4/0x2e0
> > __driver_probe_device+0x80/0xf0
> > driver_probe_device+0xe0/0x164
> > __device_attach_driver+0xc0/0x13c
> > bus_for_each_drv+0x84/0xe0
> > __device_attach+0xa4/0x1a0
> > device_initial_probe+0x1c/0x30
> > bus_probe_device+0xa4/0xb0
> > deferred_probe_work_func+0x90/0xd0
> > process_one_work+0x200/0x474
> > worker_thread+0x74/0x43c
> > kthread+0xfc/0x110
> > ret_from_fork+0x10/0x20
> > ---[ end trace ]---
> >
> > Reported-by: Laurentiu Palcu
> > Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on
> > connectors")
> > Signed-off-by: Dmitry Baryshkov
> > ---
> > drivers/gpu/drm/drm_probe_helper.c | 110 +
> > 1 file changed, 63 insertions(+), 47 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c
> > b/drivers/gpu/drm/drm_probe_helper.c
> > index 7973f2589ced..ef919d95fea6 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -222,6 +222,45 @@ drm_connector_mode_valid(struct drm_connector
> > *connector,
> > return ret;
> > }
> >
> > +static void drm_kms_helper_disable_hpd(struct drm_device *dev)
> > +{
> > + struct drm_connector *connector;
> > + struct drm_connector_list_iter conn_iter;
> > +
> > + drm_connector_list_iter_begin(dev, _iter);
> > + drm_for_each_connector_iter(connector, _iter) {
> > + const struct drm_connector_helper_funcs *funcs =
> > + connector->helper_private;
> > +
> > + if (funcs && funcs->disable_hpd)
> > + funcs->disable_hpd(connector);
> > + }
> > + drm_connector_list_iter_end(_iter);
> > +}
> > +
> > +static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
> > +{
> > + bool poll = false;
> > + struct drm_connector *connector;
> > + struct drm_connector_list_iter conn_iter;
> > +
> > + drm_connector_list_iter_begin(dev, _iter);
> > + drm_for_each_connector_iter(connector, _iter) {
> > + const
Re: [PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
Hi Dmitry,
On Thu, Jan 12, 2023 at 05:42:47PM +0200, Dmitry Baryshkov wrote:
> There are two flags attemting to guard connector polling:
> poll_enabled and poll_running. While poll_enabled semantics is clearly
> defined and fully adhered (mark that drm_kms_helper_poll_init() was
> called and not finalized by the _fini() call), the poll_running flag
> doesn't have such clearliness.
>
> This flag is used only in drm_helper_probe_single_connector_modes() to
> guard calling of drm_kms_helper_poll_enable, it doesn't guard the
> drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
> is actually running. Tie HPD enablement to this flag.
>
> This fix the following warning reported after merging the HPD series:
s/fix/fixes/
>
> Hot plug detection already enabled
> WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> Modules linked in: videobuf2_memops snd_soc_simple_card
> snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common
> snd_soc_imx_spdif adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
> CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578 #6
> Hardware name: NXP i.MX8MQ EVK (DT)
> Workqueue: events_unbound deferred_probe_work_func
> pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
> lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
> sp : 89ef3740
> x29: 89ef3740 x28: 09331f00 x27: 1000
> x26: 0020 x25: 81148ed8 x24: 0a8fe000
> x23: fffd x22: 05086348 x21: 81133ee0
> x20: 0550d800 x19: 05086288 x18: 0006
> x17: x16: 896ef008 x15: 972891004260
> x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
> x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
> x8 : 00250b00 x7 : 0003 x6 : 0011
> x5 : x4 : bd986a48 x3 : 0001
> x2 : x1 : x0 : 0025
> Call trace:
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
> drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
> drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
> drm_client_modeset_probe+0x204/0x1190 [drm]
> __drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
> drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
> drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
> drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
> dcss_kms_attach+0x1c8/0x254 [imx_dcss]
> dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
> platform_probe+0x70/0xcc
> really_probe+0xc4/0x2e0
> __driver_probe_device+0x80/0xf0
> driver_probe_device+0xe0/0x164
> __device_attach_driver+0xc0/0x13c
> bus_for_each_drv+0x84/0xe0
> __device_attach+0xa4/0x1a0
> device_initial_probe+0x1c/0x30
> bus_probe_device+0xa4/0xb0
> deferred_probe_work_func+0x90/0xd0
> process_one_work+0x200/0x474
> worker_thread+0x74/0x43c
> kthread+0xfc/0x110
> ret_from_fork+0x10/0x20
> ---[ end trace ]---
>
> Reported-by: Laurentiu Palcu
> Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on connectors")
> Signed-off-by: Dmitry Baryshkov
> ---
> drivers/gpu/drm/drm_probe_helper.c | 110 +
> 1 file changed, 63 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_probe_helper.c
> b/drivers/gpu/drm/drm_probe_helper.c
> index 7973f2589ced..ef919d95fea6 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -222,6 +222,45 @@ drm_connector_mode_valid(struct drm_connector *connector,
> return ret;
> }
>
> +static void drm_kms_helper_disable_hpd(struct drm_device *dev)
> +{
> + struct drm_connector *connector;
> + struct drm_connector_list_iter conn_iter;
> +
> + drm_connector_list_iter_begin(dev, _iter);
> + drm_for_each_connector_iter(connector, _iter) {
> + const struct drm_connector_helper_funcs *funcs =
> + connector->helper_private;
> +
> + if (funcs && funcs->disable_hpd)
> + funcs->disable_hpd(connector);
> + }
> + drm_connector_list_iter_end(_iter);
> +}
> +
> +static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
> +{
> + bool poll = false;
> + struct drm_connector *connector;
> + struct drm_connector_list_iter conn_iter;
> +
> + drm_connector_list_iter_begin(dev, _iter);
> + drm_for_each_connector_iter(connector, _iter) {
> + const struct drm_connector_helper_funcs *funcs =
> + connector->helper_private;
> +
> + if (funcs && funcs->disable_hpd)
> + funcs->disable_hpd(connector);
I believe this is not right. You probably wanted to use enable_hpd
instead of
Re: [PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
On Thu, Jan 12, 2023 at 11:42 PM Dmitry Baryshkov
wrote:
>
> There are two flags attemting to guard connector polling:
> poll_enabled and poll_running. While poll_enabled semantics is clearly
> defined and fully adhered (mark that drm_kms_helper_poll_init() was
> called and not finalized by the _fini() call), the poll_running flag
> doesn't have such clearliness.
>
> This flag is used only in drm_helper_probe_single_connector_modes() to
> guard calling of drm_kms_helper_poll_enable, it doesn't guard the
> drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
> is actually running. Tie HPD enablement to this flag.
>
> This fix the following warning reported after merging the HPD series:
>
> Hot plug detection already enabled
> WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> Modules linked in: videobuf2_memops snd_soc_simple_card
> snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common
> snd_soc_imx_spdif adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
> CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578 #6
> Hardware name: NXP i.MX8MQ EVK (DT)
> Workqueue: events_unbound deferred_probe_work_func
> pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
> lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
> sp : 89ef3740
> x29: 89ef3740 x28: 09331f00 x27: 1000
> x26: 0020 x25: 81148ed8 x24: 0a8fe000
> x23: fffd x22: 05086348 x21: 81133ee0
> x20: 0550d800 x19: 05086288 x18: 0006
> x17: x16: 896ef008 x15: 972891004260
> x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
> x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
> x8 : 00250b00 x7 : 0003 x6 : 0011
> x5 : x4 : bd986a48 x3 : 0001
> x2 : x1 : x0 : 0025
> Call trace:
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
> drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
> drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
> drm_client_modeset_probe+0x204/0x1190 [drm]
> __drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
> drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
> drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
> drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
> dcss_kms_attach+0x1c8/0x254 [imx_dcss]
> dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
> platform_probe+0x70/0xcc
> really_probe+0xc4/0x2e0
> __driver_probe_device+0x80/0xf0
> driver_probe_device+0xe0/0x164
> __device_attach_driver+0xc0/0x13c
> bus_for_each_drv+0x84/0xe0
> __device_attach+0xa4/0x1a0
> device_initial_probe+0x1c/0x30
> bus_probe_device+0xa4/0xb0
> deferred_probe_work_func+0x90/0xd0
> process_one_work+0x200/0x474
> worker_thread+0x74/0x43c
> kthread+0xfc/0x110
> ret_from_fork+0x10/0x20
> ---[ end trace ]---
>
> Reported-by: Laurentiu Palcu
> Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on connectors")
> Signed-off-by: Dmitry Baryshkov
Tested-by: Chen-Yu Tsai
on multiple MediaTek-based Chromebooks.
Re: [PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
On 12.01.2023 16:42, Dmitry Baryshkov wrote:
> There are two flags attemting to guard connector polling:
> poll_enabled and poll_running. While poll_enabled semantics is clearly
> defined and fully adhered (mark that drm_kms_helper_poll_init() was
> called and not finalized by the _fini() call), the poll_running flag
> doesn't have such clearliness.
>
> This flag is used only in drm_helper_probe_single_connector_modes() to
> guard calling of drm_kms_helper_poll_enable, it doesn't guard the
> drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
> is actually running. Tie HPD enablement to this flag.
>
> This fix the following warning reported after merging the HPD series:
>
> Hot plug detection already enabled
> WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> Modules linked in: videobuf2_memops snd_soc_simple_card
> snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common
> snd_soc_imx_spdif adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
> CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578 #6
> Hardware name: NXP i.MX8MQ EVK (DT)
> Workqueue: events_unbound deferred_probe_work_func
> pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
> lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
> sp : 89ef3740
> x29: 89ef3740 x28: 09331f00 x27: 1000
> x26: 0020 x25: 81148ed8 x24: 0a8fe000
> x23: fffd x22: 05086348 x21: 81133ee0
> x20: 0550d800 x19: 05086288 x18: 0006
> x17: x16: 896ef008 x15: 972891004260
> x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
> x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
> x8 : 00250b00 x7 : 0003 x6 : 0011
> x5 : x4 : bd986a48 x3 : 0001
> x2 : x1 : x0 : 0025
> Call trace:
> drm_bridge_hpd_enable+0x94/0x9c [drm]
> drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
> drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
> drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
> drm_client_modeset_probe+0x204/0x1190 [drm]
> __drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
> drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
> drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
> drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
> dcss_kms_attach+0x1c8/0x254 [imx_dcss]
> dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
> platform_probe+0x70/0xcc
> really_probe+0xc4/0x2e0
> __driver_probe_device+0x80/0xf0
> driver_probe_device+0xe0/0x164
> __device_attach_driver+0xc0/0x13c
> bus_for_each_drv+0x84/0xe0
> __device_attach+0xa4/0x1a0
> device_initial_probe+0x1c/0x30
> bus_probe_device+0xa4/0xb0
> deferred_probe_work_func+0x90/0xd0
> process_one_work+0x200/0x474
> worker_thread+0x74/0x43c
> kthread+0xfc/0x110
> ret_from_fork+0x10/0x20
> ---[ end trace ]---
>
> Reported-by: Laurentiu Palcu
> Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on connectors")
> Signed-off-by: Dmitry Baryshkov
Seems to be fixing the issue I've observed recently on the Amlogic Meson
based boards. Feel free to add:
Tested-by: Marek Szyprowski
> ---
> drivers/gpu/drm/drm_probe_helper.c | 110 +
> 1 file changed, 63 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_probe_helper.c
> b/drivers/gpu/drm/drm_probe_helper.c
> index 7973f2589ced..ef919d95fea6 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -222,6 +222,45 @@ drm_connector_mode_valid(struct drm_connector *connector,
> return ret;
> }
>
> +static void drm_kms_helper_disable_hpd(struct drm_device *dev)
> +{
> + struct drm_connector *connector;
> + struct drm_connector_list_iter conn_iter;
> +
> + drm_connector_list_iter_begin(dev, _iter);
> + drm_for_each_connector_iter(connector, _iter) {
> + const struct drm_connector_helper_funcs *funcs =
> + connector->helper_private;
> +
> + if (funcs && funcs->disable_hpd)
> + funcs->disable_hpd(connector);
> + }
> + drm_connector_list_iter_end(_iter);
> +}
> +
> +static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
> +{
> + bool poll = false;
> + struct drm_connector *connector;
> + struct drm_connector_list_iter conn_iter;
> +
> + drm_connector_list_iter_begin(dev, _iter);
> + drm_for_each_connector_iter(connector, _iter) {
> + const struct drm_connector_helper_funcs *funcs =
> + connector->helper_private;
> +
> + if (funcs && funcs->disable_hpd)
> +
[PATCH] drm/probe_helper: sort out poll_running vs poll_enabled
There are two flags attemting to guard connector polling:
poll_enabled and poll_running. While poll_enabled semantics is clearly
defined and fully adhered (mark that drm_kms_helper_poll_init() was
called and not finalized by the _fini() call), the poll_running flag
doesn't have such clearliness.
This flag is used only in drm_helper_probe_single_connector_modes() to
guard calling of drm_kms_helper_poll_enable, it doesn't guard the
drm_kms_helper_poll_fini(), etc. Change it to only be set if the polling
is actually running. Tie HPD enablement to this flag.
This fix the following warning reported after merging the HPD series:
Hot plug detection already enabled
WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_bridge.c:1257
drm_bridge_hpd_enable+0x94/0x9c [drm]
Modules linked in: videobuf2_memops snd_soc_simple_card
snd_soc_simple_card_utils fsl_imx8_ddr_perf videobuf2_common snd_soc_imx_spdif
adv7511 etnaviv imx8m_ddrc imx_dcss mc cec nwl_dsi gov
CPU: 2 PID: 9 Comm: kworker/u8:0 Not tainted 6.2.0-rc2-15208-g25b283acd578 #6
Hardware name: NXP i.MX8MQ EVK (DT)
Workqueue: events_unbound deferred_probe_work_func
pstate: 6005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : drm_bridge_hpd_enable+0x94/0x9c [drm]
lr : drm_bridge_hpd_enable+0x94/0x9c [drm]
sp : 89ef3740
x29: 89ef3740 x28: 09331f00 x27: 1000
x26: 0020 x25: 81148ed8 x24: 0a8fe000
x23: fffd x22: 05086348 x21: 81133ee0
x20: 0550d800 x19: 05086288 x18: 0006
x17: x16: 896ef008 x15: 972891004260
x14: 2a1403e19400 x13: 972891004260 x12: 2a1403e19400
x11: 7100385f29400801 x10: 0aa0 x9 : 88112744
x8 : 00250b00 x7 : 0003 x6 : 0011
x5 : x4 : bd986a48 x3 : 0001
x2 : x1 : x0 : 0025
Call trace:
drm_bridge_hpd_enable+0x94/0x9c [drm]
drm_bridge_connector_enable_hpd+0x2c/0x3c [drm_kms_helper]
drm_kms_helper_poll_enable+0x94/0x10c [drm_kms_helper]
drm_helper_probe_single_connector_modes+0x1a8/0x510 [drm_kms_helper]
drm_client_modeset_probe+0x204/0x1190 [drm]
__drm_fb_helper_initial_config_and_unlock+0x5c/0x4a4 [drm_kms_helper]
drm_fb_helper_initial_config+0x54/0x6c [drm_kms_helper]
drm_fbdev_client_hotplug+0xd0/0x140 [drm_kms_helper]
drm_fbdev_generic_setup+0x90/0x154 [drm_kms_helper]
dcss_kms_attach+0x1c8/0x254 [imx_dcss]
dcss_drv_platform_probe+0x90/0xfc [imx_dcss]
platform_probe+0x70/0xcc
really_probe+0xc4/0x2e0
__driver_probe_device+0x80/0xf0
driver_probe_device+0xe0/0x164
__device_attach_driver+0xc0/0x13c
bus_for_each_drv+0x84/0xe0
__device_attach+0xa4/0x1a0
device_initial_probe+0x1c/0x30
bus_probe_device+0xa4/0xb0
deferred_probe_work_func+0x90/0xd0
process_one_work+0x200/0x474
worker_thread+0x74/0x43c
kthread+0xfc/0x110
ret_from_fork+0x10/0x20
---[ end trace ]---
Reported-by: Laurentiu Palcu
Fixes: c8268795c9a9 ("drm/probe-helper: enable and disable HPD on connectors")
Signed-off-by: Dmitry Baryshkov
---
drivers/gpu/drm/drm_probe_helper.c | 110 +
1 file changed, 63 insertions(+), 47 deletions(-)
diff --git a/drivers/gpu/drm/drm_probe_helper.c
b/drivers/gpu/drm/drm_probe_helper.c
index 7973f2589ced..ef919d95fea6 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -222,6 +222,45 @@ drm_connector_mode_valid(struct drm_connector *connector,
return ret;
}
+static void drm_kms_helper_disable_hpd(struct drm_device *dev)
+{
+ struct drm_connector *connector;
+ struct drm_connector_list_iter conn_iter;
+
+ drm_connector_list_iter_begin(dev, _iter);
+ drm_for_each_connector_iter(connector, _iter) {
+ const struct drm_connector_helper_funcs *funcs =
+ connector->helper_private;
+
+ if (funcs && funcs->disable_hpd)
+ funcs->disable_hpd(connector);
+ }
+ drm_connector_list_iter_end(_iter);
+}
+
+static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
+{
+ bool poll = false;
+ struct drm_connector *connector;
+ struct drm_connector_list_iter conn_iter;
+
+ drm_connector_list_iter_begin(dev, _iter);
+ drm_for_each_connector_iter(connector, _iter) {
+ const struct drm_connector_helper_funcs *funcs =
+ connector->helper_private;
+
+ if (funcs && funcs->disable_hpd)
+ funcs->disable_hpd(connector);
+
+ if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
+DRM_CONNECTOR_POLL_DISCONNECT))
+ poll = true;
+ }
+ drm_connector_list_iter_end(_iter);
+
+ return poll;
+}
+
#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
/**
* drm_kms_helper_poll_enable - re-enable
