[PATCH 01/10] drm/fb-helper: Call dirty helper after writing to fbdev

[PATCH 01/10] drm/fb-helper: Call dirty helper after writing to fbdev

[Thomas Zimmermann]

If fbdev uses a shadow framebuffer, call the damage handler. Otherwise
the update might not make it to the screen.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 222ec45f4c69 ("drm/fb_helper: Support framebuffers in I/O memory")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: virtualization@lists.linux-foundation.org
---
 drivers/gpu/drm/drm_fb_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 25edf670867c..ee1a19e22df2 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2189,6 +2189,9 @@ static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf,
 	if (ret > 0)
 		*ppos += ret;
 
+	if (ret > 0)
+		drm_fb_helper_dirty(info, 0, 0, info->var.xres, info->var.yres);
+
 	return ret ? ret : err;
 }
 
-- 
2.29.2

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Re: [PATCH 01/10] drm/fb-helper: Call dirty helper after writing to fbdev

[Ville Syrjälä]

On Mon, Nov 16, 2020 at 09:04:28PM +0100, Thomas Zimmermann wrote:
> If fbdev uses a shadow framebuffer, call the damage handler. Otherwise
> the update might not make it to the screen.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Fixes: 222ec45f4c69 ("drm/fb_helper: Support framebuffers in I/O memory")
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: virtualization@lists.linux-foundation.org
> ---
>  drivers/gpu/drm/drm_fb_helper.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 25edf670867c..ee1a19e22df2 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2189,6 +2189,9 @@ static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf,
>  	if (ret > 0)
>  		*ppos += ret;
>  
> +	if (ret > 0)
> +		drm_fb_helper_dirty(info, 0, 0, info->var.xres, info->var.yres);

Should that rather be 0->{x,y}res_virtual or {x,y}offset->{x,y}res?

> +
>  	return ret ? ret : err;
>  }
>  
> -- 
> 2.29.2
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel
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Re: [PATCH 01/10] drm/fb-helper: Call dirty helper after writing to fbdev

[Thomas Zimmermann]

Hi

Am 17.11.20 um 17:22 schrieb Ville Syrjälä:
> On Mon, Nov 16, 2020 at 09:04:28PM +0100, Thomas Zimmermann wrote:
>> If fbdev uses a shadow framebuffer, call the damage handler. Otherwise
>> the update might not make it to the screen.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> Fixes: 222ec45f4c69 ("drm/fb_helper: Support framebuffers in I/O memory")
>> Cc: Thomas Zimmermann <tzimmermann@suse.de>
>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Cc: Sam Ravnborg <sam@ravnborg.org>
>> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> Cc: Maxime Ripard <mripard@kernel.org>
>> Cc: David Airlie <airlied@linux.ie>
>> Cc: Daniel Vetter <daniel@ffwll.ch>
>> Cc: Gerd Hoffmann <kraxel@redhat.com>
>> Cc: dri-devel@lists.freedesktop.org
>> Cc: virtualization@lists.linux-foundation.org
>> ---
>>  drivers/gpu/drm/drm_fb_helper.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
>> index 25edf670867c..ee1a19e22df2 100644
>> --- a/drivers/gpu/drm/drm_fb_helper.c
>> +++ b/drivers/gpu/drm/drm_fb_helper.c
>> @@ -2189,6 +2189,9 @@ static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf,
>>  	if (ret > 0)
>>  		*ppos += ret;
>>  
>> +	if (ret > 0)
>> +		drm_fb_helper_dirty(info, 0, 0, info->var.xres, info->var.yres);
> 
> Should that rather be 0->{x,y}res_virtual or {x,y}offset->{x,y}res?

That code snippet works in drm_fb_helper_sys_write().

However these are framebuffer-relative coordinates. I guess *res_virtual
would be more correct. I'll update the patch accordingly. Thanks for
pointing this out.

Best regards
Thomas

> 
>> +
>>  	return ret ? ret : err;
>>  }
>>  
>> -- 
>> 2.29.2
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
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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