On Fri, Oct 17, 2014 at 10:28 AM, Daniel Thompson daniel.thompson@linaro.org wrote:
Currently forcing the video mode from the kernel command line (for example video=HDMI-A-1:1280x720-16@60) does not correctly set the number of bits per pixel. This is due to a rather aggressive override in msm_fbdev_create(). This is a particular problem for Android bring up because the software EGL fallbacks don't support 32bpp.
This problem could be trivially fixed by removing the override completely. However to avoid regressing commit 96673ecbd7f6 ("drm/msm: default to XR24 rather than AR24") this patch continues to override the depth if there are 32 bits per pixel.
Change was tested by dd'ing a test image to /dev/fb0 with no video= (still 32bpp, DBG() message observed), video=1920x1080-32@60 (message observed), video=1920x1080-24@60 and video=1920x1080-16@60 .
Signed-off-by: Daniel Thompson daniel.thompson@linaro.org Cc: David Airlie airlied@linux.ie Cc: Rob Clark robdclark@gmail.com
drivers/gpu/drm/msm/msm_fbdev.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c index ab5bfd2..ed0171d 100644 --- a/drivers/gpu/drm/msm/msm_fbdev.c +++ b/drivers/gpu/drm/msm/msm_fbdev.c @@ -93,8 +93,10 @@ static int msm_fbdev_create(struct drm_fb_helper *helper, uint32_t paddr; int ret, size;
sizes->surface_bpp = 32;sizes->surface_depth = 24;
if (sizes->surface_bpp == 32) {DBG("forcing surface depth to 24\n");sizes->surface_depth = 24;}
Thanks.. we could probably even drop this forcing depth to 24.. from a quick check in drm_fb_helper_single_fb_probe() the default is 24/32 which should be enough for the "flicker-free" handover from splash screen to X.
Not really sure why I was forcing the depth/bpp.. I think copy/paste of a hack from another driver to do video 'underlays' ;-)
BR, -R
DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, sizes->surface_height, sizes->surface_bpp,-- 1.9.3