Hi Am 04.10.21 um 10:23 schrieb Ville Syrjälä:
On Mon, Oct 04, 2021 at 10:15:06AM +0200, Thomas Zimmermann wrote:Clamp the fbdev surface size of the available maximum 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. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Reported-by: Amanoel Dawod <kernel@xxxxxxxxxxxxxxxx> Reported-by: Zoltán Kővágó <dirty.ice.hu@xxxxxxxxx> Reported-by: Michael Stapelberg <michael+lkml@xxxxxxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: Maxime Ripard <maxime@xxxxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: <stable@xxxxxxxxxxxxxxx> # v5.14+ --- drivers/gpu/drm/drm_fb_helper.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 6860223f0068..364f11900b37 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1508,6 +1508,7 @@ 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; @@ -1665,6 +1666,11 @@ 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_warn(dev, "Fbdev over-allocation too large; clamping height to %d\n", + config->max_height);drm_warn() seems a bit excessive. drm_info()? Or could just have no printk and use a simple min() perhaps.
The framebuffer code uses debug_kms for this kind of message. I guess, I'll go with that.
Best regards Thamas
+ sizes.surface_height = config->max_height; + } /* push down into drivers */ ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); -- 2.33.0
-- 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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