The patch below does not apply to the 5.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From bcc6aa61c82d4f12df3ecc884a9eef9d566edae9 Mon Sep 17 00:00:00 2001
From: Eryk Brol eryk.brol@amd.com Date: Fri, 19 Jun 2020 14:42:09 -0400 Subject: [PATCH] drm/amd/display: Fix DSC force enable on SST
[why] Previously when force enabling DSC on SST display we unknowingly supressed lane count, which caused DSC to be enabled automatically.
[how] By adding an additional flag to force enable DSC in dc_dsc.c DSC can always be enabled with debugfs dsc_clock_en forced to 1
Cc: stable@vger.kernel.org Signed-off-by: Eryk Brol eryk.brol@amd.com Signed-off-by: Mikita Lipski mikita.lipski@amd.com Reviewed-by: Wenjing Liu Wenjing.Liu@amd.com Acked-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com
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 0d121a3f2103..ad6b95d65f7b 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4646,6 +4646,9 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
#if defined(CONFIG_DRM_AMD_DC_DCN) if (dsc_caps.is_dsc_supported) { + /* Set DSC policy according to dsc_clock_en */ + dc_dsc_policy_set_enable_dsc_when_not_needed(aconnector->dsc_settings.dsc_clock_en); + if (dc_dsc_compute_config(aconnector->dc_link->ctx->dc->res_pool->dscs[0], &dsc_caps, aconnector->dc_link->ctx->dc->debug.dsc_min_slice_height_override, diff --git a/drivers/gpu/drm/amd/display/dc/dc_dsc.h b/drivers/gpu/drm/amd/display/dc/dc_dsc.h index 3800340a5b4f..768ab38d41cf 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dsc.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dsc.h @@ -51,6 +51,7 @@ struct dc_dsc_policy { int min_slice_height; // Must not be less than 8 uint32_t max_target_bpp; uint32_t min_target_bpp; + bool enable_dsc_when_not_needed; };
bool dc_dsc_parse_dsc_dpcd(const struct dc *dc, @@ -80,4 +81,6 @@ void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing,
void dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit);
+void dc_dsc_policy_set_enable_dsc_when_not_needed(bool enable); + #endif diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c index 8cdaa6eef5d3..da1b654833d5 100644 --- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c +++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c @@ -34,6 +34,9 @@ /* default DSC policy target bitrate limit is 16bpp */ static uint32_t dsc_policy_max_target_bpp_limit = 16;
+/* default DSC policy enables DSC only when needed */ +static bool dsc_policy_enable_dsc_when_not_needed; + static uint32_t dc_dsc_bandwidth_in_kbps_from_timing( const struct dc_crtc_timing *timing) { @@ -360,7 +363,7 @@ static bool decide_dsc_target_bpp_x16(
get_dsc_bandwidth_range(policy->min_target_bpp, policy->max_target_bpp, dsc_common_caps, timing, &range); - if (target_bandwidth_kbps >= range.stream_kbps) { + if (!policy->enable_dsc_when_not_needed && target_bandwidth_kbps >= range.stream_kbps) { /* enough bandwidth without dsc */ *target_bpp_x16 = 0; should_use_dsc = false; @@ -961,9 +964,20 @@ void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, struct dc /* internal upper limit, default 16 bpp */ if (policy->max_target_bpp > dsc_policy_max_target_bpp_limit) policy->max_target_bpp = dsc_policy_max_target_bpp_limit; + + /* enable DSC when not needed, default false */ + if (dsc_policy_enable_dsc_when_not_needed) + policy->enable_dsc_when_not_needed = dsc_policy_enable_dsc_when_not_needed; + else + policy->enable_dsc_when_not_needed = false; }
void dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit) { dsc_policy_max_target_bpp_limit = limit; } + +void dc_dsc_policy_set_enable_dsc_when_not_needed(bool enable) +{ + dsc_policy_enable_dsc_when_not_needed = enable; +}