diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2462-drm-amd-display-Move-link-functions-from-dc-to-dc_li.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2462-drm-amd-display-Move-link-functions-from-dc-to-dc_li.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2462-drm-amd-display-Move-link-functions-from-dc-to-dc_li.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2462-drm-amd-display-Move-link-functions-from-dc-to-dc_li.patch new file mode 100644 index 00000000..d49178ed --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2462-drm-amd-display-Move-link-functions-from-dc-to-dc_li.patch @@ -0,0 +1,61 @@ +From 33c8f16adbd0f4c2352beffcbb9c2bc87b618a97 Mon Sep 17 00:00:00 2001 +From: Chris Park <Chris.Park@amd.com> +Date: Fri, 10 May 2019 13:34:30 -0400 +Subject: [PATCH 2462/2940] drm/amd/display: Move link functions from dc to + dc_link + +[Why] +link-specific functions should reside in dc_link.c + +[How] +Move them there. + +Signed-off-by: Chris Park <Chris.Park@amd.com> +Reviewed-by: Charlene Liu <Charlene.Liu@amd.com> +Acked-by: Leo Li <sunpeng.li@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link.c | 27 +++++++++++++++++++ + 1 file changed, 27 insertions(+) + +diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +index b43bcdfd0caf..28cb4b3ce7af 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +@@ -3053,6 +3053,33 @@ uint32_t dc_link_bandwidth_kbps( + link_bw_kbps *= 8; /* 8 bits per byte*/ + link_bw_kbps *= link_setting->lane_count; + ++#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT ++ if (link->dpcd_caps.fec_cap.bits.FEC_CAPABLE) { ++ /* Account for FEC overhead. ++ * We have to do it based on caps, ++ * and not based on FEC being set ready, ++ * because FEC is set ready too late in ++ * the process to correctly be picked up ++ * by mode enumeration. ++ * ++ * There's enough zeros at the end of 'kbps' ++ * that make the below operation 100% precise ++ * for our purposes. ++ * 'long long' makes it work even for HDMI 2.1 ++ * max bandwidth (and much, much bigger bandwidths ++ * than that, actually). ++ * ++ * NOTE: Reducing link BW by 3% may not be precise ++ * because it may be a stream BT that increases by 3%, and so ++ * 1/1.03 = 0.970873 factor should have been used instead, ++ * but the difference is minimal and is in a safe direction, ++ * which all works well around potential ambiguity of DP 1.4a spec. ++ */ ++ long long fec_link_bw_kbps = link_bw_kbps * 970LL; ++ link_bw_kbps = (uint32_t)(fec_link_bw_kbps / 1000LL); ++ } ++#endif ++ + return link_bw_kbps; + + } +-- +2.17.1 + |