From: Thomas Zimmermann <[email protected]>
commit b693e42921e0220c0d564c55c6cdc680b0f85390 upstream.
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 <[email protected]>
Fixes: 11e8f5fd223b ("drm: Add simpledrm driver")
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Reported-by: Amanoel Dawod <[email protected]>
Reported-by: Zoltán Kővágó <[email protected]>
Reported-by: Michael Stapelberg <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # v5.14+
Link:
https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/drm_fb_helper.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1506,6 +1506,7 @@ static int drm_fb_helper_single_fb_probe
{
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
/* 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);
