drm/amd/display: Block SubVP on displays that have pixclk > 1800Mhz

[Description]
- Enabling SubVP on high refresh rate displays had a side effect
  of also enabling on high bandwidth displays such as 8K60
- However, these are not validated and should be blocked for
  the time being
- Block SubVP on displays that have pix rate > 1800Mhz (includes
  8K60 displays)

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Nevenko Stupar <Nevenko.Stupar@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
index 04be01a..42ccfd1 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
@@ -41,6 +41,7 @@
 #define DCN3_2_DCFCLK_DS_INIT_KHZ 10000 // Choose 10Mhz for init DCFCLK DS freq
 #define DCN3_2_MIN_ACTIVE_SWITCH_MARGIN_FPO_US 100 // Only allow FPO + Vactive if active margin >= 100
 #define SUBVP_HIGH_REFRESH_LIST_LEN 3
+#define DCN3_2_MAX_SUBVP_PIXEL_RATE_MHZ 1800
 
 #define TO_DCN32_RES_POOL(pool)\
        container_of(pool, struct dcn32_resource_pool, base)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
index cd28980..f7e45d9 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
@@ -703,6 +703,7 @@ static bool dcn32_assign_subvp_pipe(struct dc *dc,
                 * - Not TMZ surface
                 */
                if (pipe->plane_state && !pipe->top_pipe && !dcn32_is_center_timing(pipe) &&
+                               !(pipe->stream->timing.pix_clk_100hz / 10000 > DCN3_2_MAX_SUBVP_PIXEL_RATE_MHZ) &&
                                (!dcn32_is_psr_capable(pipe) || (context->stream_count == 1 && dc->caps.dmub_caps.subvp_psr)) &&
                                pipe->stream->mall_stream_config.type == SUBVP_NONE &&
                                (refresh_rate < 120 || dcn32_allow_subvp_high_refresh_rate(dc, context, pipe)) &&