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drm/amd/display: Fix DSC force enable on SST

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[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>
This commit is contained in:
Eryk Brol 2020-06-19 14:42:09 -04:00 committed by Alex Deucher
parent 4bb23a5446
commit bcc6aa61c8
3 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -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,

3
drivers/gpu/drm/amd/display/dc/dc_dsc.h
View File

@ -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

16
drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
View File

@ -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;
}