Re: [PATCH v3 04/10] drm/fbdev-generic: Initialize fb-helper structure in generic setup
On Fri, Jan 27, 2023 at 03:21:30PM +0100, Thomas Zimmermann wrote: > Hi > > Am 25.01.23 um 22:03 schrieb Sam Ravnborg: > > Hi Thomas, > > > > On Wed, Jan 25, 2023 at 09:04:09PM +0100, Thomas Zimmermann wrote: > > > Initialize the fb-helper structure immediately after its allocation > > > in drm_fbdev_generic_setup(). That will make it easier to fill it with > > > driver-specific values, such as the preferred BPP. > > > > > > Signed-off-by: Thomas Zimmermann > > > Reviewed-by: Javier Martinez Canillas > > > --- > > > drivers/gpu/drm/drm_fbdev_generic.c | 13 + > > > 1 file changed, 9 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/drm_fbdev_generic.c > > > b/drivers/gpu/drm/drm_fbdev_generic.c > > > index 135d58b8007b..63f66325a8a5 100644 > > > --- a/drivers/gpu/drm/drm_fbdev_generic.c > > > +++ b/drivers/gpu/drm/drm_fbdev_generic.c > > > @@ -385,8 +385,6 @@ static int drm_fbdev_client_hotplug(struct > > > drm_client_dev *client) > > > if (dev->fb_helper) > > > return drm_fb_helper_hotplug_event(dev->fb_helper); > > > - drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs); > > > - > > > ret = drm_fb_helper_init(dev, fb_helper); > > > if (ret) > > > goto err; > > > > From the documentation: > > The drm_fb_helper_prepare() > > helper must be called first to initialize the minimum required to make > > hotplug detection work. > > ... > > To finish up the fbdev helper initialization, the > > drm_fb_helper_init() function is called. > > > > So this change do not follow the documentation as drm_fb_helper_init() > > is now called before drm_fb_helper_prepare() > > No, we now call drm_fb_helper_prepare() from within > drm_fbdev_generic_setup(), right after allocating the fb_helper. > drm_fb_helper_init() will only be called after the client received a > hot-plug event. > > > > > I did not follow all the code - but my gut feeling is that the > > documentation is right. > > The docs are of low quality. The _prepare() helper is the actual init > function and _init() only sets the fb_helper in the device instance. OK, thanks for the follow-up. Sam
Re: [PATCH v3 04/10] drm/fbdev-generic: Initialize fb-helper structure in generic setup
Hi
Am 25.01.23 um 22:03 schrieb Sam Ravnborg:
Hi Thomas,
On Wed, Jan 25, 2023 at 09:04:09PM +0100, Thomas Zimmermann wrote:
Initialize the fb-helper structure immediately after its allocation
in drm_fbdev_generic_setup(). That will make it easier to fill it with
driver-specific values, such as the preferred BPP.
Signed-off-by: Thomas Zimmermann
Reviewed-by: Javier Martinez Canillas
---
drivers/gpu/drm/drm_fbdev_generic.c | 13 +
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_fbdev_generic.c
b/drivers/gpu/drm/drm_fbdev_generic.c
index 135d58b8007b..63f66325a8a5 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -385,8 +385,6 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev
*client)
if (dev->fb_helper)
return drm_fb_helper_hotplug_event(dev->fb_helper);
- drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
-
ret = drm_fb_helper_init(dev, fb_helper);
if (ret)
goto err;
From the documentation:
The drm_fb_helper_prepare()
helper must be called first to initialize the minimum required to make
hotplug detection work.
...
To finish up the fbdev helper initialization, the
drm_fb_helper_init() function is called.
So this change do not follow the documentation as drm_fb_helper_init()
is now called before drm_fb_helper_prepare()
No, we now call drm_fb_helper_prepare() from within
drm_fbdev_generic_setup(), right after allocating the fb_helper.
drm_fb_helper_init() will only be called after the client received a
hot-plug event.
I did not follow all the code - but my gut feeling is that the
documentation is right.
The docs are of low quality. The _prepare() helper is the actual init
function and _init() only sets the fb_helper in the device instance.
Best regards
Thomas
Sam
@@ -456,12 +454,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
if (!fb_helper)
return;
+ drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
ret = drm_client_init(dev, _helper->client, "fbdev", _fbdev_client_funcs);
if (ret) {
- kfree(fb_helper);
drm_err(dev, "Failed to register client: %d\n", ret);
- return;
+ goto err_drm_client_init;
}
/*
@@ -484,5 +482,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
drm_client_register(_helper->client);
+
+ return;
+
+err_drm_client_init:
+ drm_fb_helper_unprepare(fb_helper);
+ kfree(fb_helper);
+ return;
}
EXPORT_SYMBOL(drm_fbdev_generic_setup);
--
2.39.0
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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Description: OpenPGP digital signature
Re: [PATCH v3 04/10] drm/fbdev-generic: Initialize fb-helper structure in generic setup
Hi Thomas,
On Wed, Jan 25, 2023 at 09:04:09PM +0100, Thomas Zimmermann wrote:
> Initialize the fb-helper structure immediately after its allocation
> in drm_fbdev_generic_setup(). That will make it easier to fill it with
> driver-specific values, such as the preferred BPP.
>
> Signed-off-by: Thomas Zimmermann
> Reviewed-by: Javier Martinez Canillas
> ---
> drivers/gpu/drm/drm_fbdev_generic.c | 13 +
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fbdev_generic.c
> b/drivers/gpu/drm/drm_fbdev_generic.c
> index 135d58b8007b..63f66325a8a5 100644
> --- a/drivers/gpu/drm/drm_fbdev_generic.c
> +++ b/drivers/gpu/drm/drm_fbdev_generic.c
> @@ -385,8 +385,6 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev
> *client)
> if (dev->fb_helper)
> return drm_fb_helper_hotplug_event(dev->fb_helper);
>
> - drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
> -
> ret = drm_fb_helper_init(dev, fb_helper);
> if (ret)
> goto err;
>From the documentation:
The drm_fb_helper_prepare()
helper must be called first to initialize the minimum required to make
hotplug detection work.
...
To finish up the fbdev helper initialization, the
drm_fb_helper_init() function is called.
So this change do not follow the documentation as drm_fb_helper_init()
is now called before drm_fb_helper_prepare()
I did not follow all the code - but my gut feeling is that the
documentation is right.
Sam
> @@ -456,12 +454,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
> fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
> if (!fb_helper)
> return;
> + drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
>
> ret = drm_client_init(dev, _helper->client, "fbdev",
> _fbdev_client_funcs);
> if (ret) {
> - kfree(fb_helper);
> drm_err(dev, "Failed to register client: %d\n", ret);
> - return;
> + goto err_drm_client_init;
> }
>
> /*
> @@ -484,5 +482,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
> drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
>
> drm_client_register(_helper->client);
> +
> + return;
> +
> +err_drm_client_init:
> + drm_fb_helper_unprepare(fb_helper);
> + kfree(fb_helper);
> + return;
> }
> EXPORT_SYMBOL(drm_fbdev_generic_setup);
> --
> 2.39.0
[PATCH v3 04/10] drm/fbdev-generic: Initialize fb-helper structure in generic setup
Initialize the fb-helper structure immediately after its allocation
in drm_fbdev_generic_setup(). That will make it easier to fill it with
driver-specific values, such as the preferred BPP.
Signed-off-by: Thomas Zimmermann
Reviewed-by: Javier Martinez Canillas
---
drivers/gpu/drm/drm_fbdev_generic.c | 13 +
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_fbdev_generic.c
b/drivers/gpu/drm/drm_fbdev_generic.c
index 135d58b8007b..63f66325a8a5 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -385,8 +385,6 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev
*client)
if (dev->fb_helper)
return drm_fb_helper_hotplug_event(dev->fb_helper);
- drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
-
ret = drm_fb_helper_init(dev, fb_helper);
if (ret)
goto err;
@@ -456,12 +454,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
if (!fb_helper)
return;
+ drm_fb_helper_prepare(dev, fb_helper, _fb_helper_generic_funcs);
ret = drm_client_init(dev, _helper->client, "fbdev",
_fbdev_client_funcs);
if (ret) {
- kfree(fb_helper);
drm_err(dev, "Failed to register client: %d\n", ret);
- return;
+ goto err_drm_client_init;
}
/*
@@ -484,5 +482,12 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
drm_client_register(_helper->client);
+
+ return;
+
+err_drm_client_init:
+ drm_fb_helper_unprepare(fb_helper);
+ kfree(fb_helper);
+ return;
}
EXPORT_SYMBOL(drm_fbdev_generic_setup);
--
2.39.0
