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Commit 71835caa authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: fb: Force alpha formats 



Tegra20 and Tegra30 don't actually support the 24-bit RGB formats that
don't have an alpha component. In order to allow the fbdev emulation to
run on those chips, force the 32-bit RGBA formats.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 7b2c2845

drivers/gpu/drm/tegra/fb.c

+13 −0
Original line number Diff line number Diff line
@@ -253,6 +253,19 @@ static int tegra_fbdev_probe(struct drm_fb_helper *helper, 
	cmd.height = sizes->surface_height;

	cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,

				  tegra->pitch_align);



	/*

	 * Early generations of Tegra (Tegra20 and Tegra30) do not support any

	 * of the X* or *X formats, only their A* or *A equivalents. Force the

	 * legacy framebuffer format to include an alpha component so that the

	 * framebuffer emulation can be supported on all generations.

	 */

	if (sizes->surface_bpp == 32 && sizes->surface_depth == 24)

		sizes->surface_depth = 32;



	if (sizes->surface_bpp == 16 && sizes->surface_depth == 15)

		sizes->surface_depth = 16;



	cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,

						     sizes->surface_depth);