From 580204038f5b6f4218dbefb9a0ec89a675b1d45b Mon Sep 17 00:00:00 2001 From: Mario Kleiner Date: Fri, 19 Mar 2021 22:03:17 +0100 Subject: [PATCH] drm/amd/display: Enable support for 16 bpc fixed-point framebuffers. This is intended to enable direct high-precision scanout and pageflip of Vulkan swapchain images in format VK_FORMAT_R16G16B16A16_UNORM. Expose DRM_FORMAT_XRGB16161616, DRM_FORMAT_ARGB16161616, DRM_FORMAT_XBGR16161616 and DRM_FORMAT_ABGR16161616 as 16 bpc unsigned normalized formats. These allow to take full advantage of the maximum precision of the display hardware, ie. currently up to 12 bpc. Searching through old AMD M56, M76 and RV630 hw programming docs suggests that these 16 bpc formats are supported by all DCE and DCN display engines, so we can expose the formats unconditionally. Successfully tested on AMD Polaris11 DCE-11.2 an RavenRidge DCN-1.0 with a HDR-10 monitor over 10 bpc DP output with spatial dithering enabled by the driver. Picture looks good, and my photometer measurement procedure confirms an effective 12 bpc color reproduction. Signed-off-by: Mario Kleiner Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index e538324..f14700a 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4962,6 +4962,14 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev, case DRM_FORMAT_ABGR16161616F: plane_info->format = SURFACE_PIXEL_FORMAT_GRPH_ABGR16161616F; break; + case DRM_FORMAT_XRGB16161616: + case DRM_FORMAT_ARGB16161616: + plane_info->format = SURFACE_PIXEL_FORMAT_GRPH_ARGB16161616; + break; + case DRM_FORMAT_XBGR16161616: + case DRM_FORMAT_ABGR16161616: + plane_info->format = SURFACE_PIXEL_FORMAT_GRPH_ABGR16161616; + break; default: DRM_ERROR( "Unsupported screen format %p4cc\n", @@ -7093,6 +7101,10 @@ static const uint32_t rgb_formats[] = { DRM_FORMAT_XBGR2101010, DRM_FORMAT_ARGB2101010, DRM_FORMAT_ABGR2101010, + DRM_FORMAT_XRGB16161616, + DRM_FORMAT_XBGR16161616, + DRM_FORMAT_ARGB16161616, + DRM_FORMAT_ABGR16161616, DRM_FORMAT_XBGR8888, DRM_FORMAT_ABGR8888, DRM_FORMAT_RGB565, -- 2.7.4