Hi

Am 17.11.20 um 17:22 schrieb Ville Syrjälä:

On Mon, Nov 16, 2020 at 09:04:28PM +0100, Thomas Zimmermann wrote:

quoted

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 <redacted>
Cc: Sam Ravnborg <redacted>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <redacted>
Cc: Daniel Vetter <redacted>
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

quoted

+
 	return ret ? ret : err;
 }
 
-- 
2.29.2

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-- 
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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