[PATCH 1/4] drm/udl: Replace fbdev code with generic emulation

[Thomas Zimmermann]

Hi

Am 08.11.19 um 16:37 schrieb Noralf Trønnes:
> 
> 
> Den 08.11.2019 13.33, skrev Thomas Zimmermann:
>> The udl driver can use the generic fbdev implementation. Convert it.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
>> ---
> 
>> diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
>> index 563cc5809e56..55c0f9dfee29 100644
>> --- a/drivers/gpu/drm/udl/udl_drv.c
>> +++ b/drivers/gpu/drm/udl/udl_drv.c
> 
>> @@ -47,6 +48,8 @@ static struct drm_driver driver = {
>>  	.driver_features = DRIVER_MODESET | DRIVER_GEM,
>>  	.release = udl_driver_release,
>>  
>> +	.lastclose = drm_fb_helper_lastclose,
>> +
> 
> No need to set this, it's already wired up:
> 
> drm_lastclose -> drm_client_dev_restore -> drm_fbdev_client_restore ->
> drm_fb_helper_lastclose
> 
>>  	/* gem hooks */
>>  	.gem_create_object = udl_driver_gem_create_object,
>>  
> 
>> diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
>> index f8153b726343..afe74f892a2b 100644
>> --- a/drivers/gpu/drm/udl/udl_fb.c
>> +++ b/drivers/gpu/drm/udl/udl_fb.c
>> @@ -20,19 +20,9 @@
>>  
>>  #include "udl_drv.h"
>>  
>> -#define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */
>> -
>> -static int fb_defio = 0;  /* Optionally enable experimental fb_defio mmap support */
>>  static int fb_bpp = 16;
>>  
>>  module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
> 
> Maybe fb_bpp can be dropped too?

Sure, makes sense.

The driver exposes a preferred color depth of 24 bpp, which we may want
to change to 16 then. The internal framebuffer is only 16 bpp anyway.

Best regards
Thomas

> 
> It's possible to set it on the command line:
> 
> video=<xres>x<yres>-<bpp>
> 
> I haven't tried it so I can't say for certain that it actually works>
> Ref: Documentation/fb/modedb.rst and drm_fb_helper_single_fb_probe()
> 
>> -module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
>> -
> 
>> diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
>> index bc1ab6060dc6..1517d5e881b8 100644
>> --- a/drivers/gpu/drm/udl/udl_modeset.c
>> +++ b/drivers/gpu/drm/udl/udl_modeset.c
> 
>> @@ -422,7 +423,7 @@ static int udl_crtc_init(struct drm_device *dev)
>>  
>>  static const struct drm_mode_config_funcs udl_mode_funcs = {
>>  	.fb_create = udl_fb_user_fb_create,
>> -	.output_poll_changed = NULL,
>> +	.output_poll_changed = drm_fb_helper_output_poll_changed,
> 
> No need to set this, it's already wired up:
> 
> drm_kms_helper_hotplug_event -> drm_client_dev_hotplug ->
> drm_fbdev_client_hotplug -> drm_fb_helper_hotplug_event
> 
> Noralf.
> 
>>  };
>>  
>>  int udl_modeset_init(struct drm_device *dev)
>>

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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