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drm/fbdev: Clamp fbdev surface size if too large

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Clamp the fbdev surface size of the available maximumi height to avoid
failing to init console emulation. An example error is shown below.

  bad framebuffer height 2304, should be >= 768 && <= 768
  [drm] Initialized simpledrm 1.0.0 20200625 for simple-framebuffer.0 on minor 0
  simple-framebuffer simple-framebuffer.0: [drm] *ERROR* fbdev: Failed to setup generic emulation (ret=-22)

This is especially a problem with drivers that have very small screen
sizes and cannot over-allocate at all.

v2:
	* reduce warning level (Ville)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 11e8f5fd22 ("drm: Add simpledrm driver")
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reported-by: Amanoel Dawod <kernel@amanoeldawod.com>
Reported-by: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Reported-by: Michael Stapelberg <michael+lkml@stapelberg.ch>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.14+
Link: https://patchwork.freedesktop.org/patch/msgid/20211005070355.7680-1-tzimmermann@suse.de
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Zimmermann 2021-10-05 09:03:55 +02:00 committed by Dave Airlie
parent 97794170b6
commit b693e42921
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/drm_fb_helper.c
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@ -1506,6 +1506,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_mode_config *config = &dev->mode_config;
int ret = 0;
int crtc_count = 0;
struct drm_connector_list_iter conn_iter;
@ -1663,6 +1664,11 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
/* Handle our overallocation */
sizes.surface_height *= drm_fbdev_overalloc;
sizes.surface_height /= 100;
if (sizes.surface_height > config->max_height) {
drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
config->max_height);
sizes.surface_height = config->max_height;
}
/* push down into drivers */
ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);