[PATCH 07/26] drm/amd/display: Add ASIC cap to limit DCC surface width

[Fangzhi Zuo]

From: George Shen <george.shen at amd.com>

[Why]
Certain configurations of DCN401 require ODM4:1 to support DCC for 10K
surfaces. DCC should be conservatively disabled in those cases.

The issue is that current logic limits 10K surface DCC for all
configurations of DCN401.

[How]
Add DC ASIC cap to indicate max surface width that can support DCC.
Disable DCC if this ASIC cap is non-zero and surface width exceeds it.

Reviewed-by: Jun Lei <jun.lei at amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo at amd.com>
Signed-off-by: George Shen <george.shen at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                         | 2 ++
 .../gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c    | 6 ++++++
 .../drm/amd/display/dc/resource/dcn401/dcn401_resource.c    | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 900892855436..55b94a72ddc2 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -293,6 +293,8 @@ struct dc_caps {
 	bool cursor_not_scaled;
 	bool dcmode_power_limits_present;
 	bool sequential_ono;
+	/* Conservative limit for DCC cases which require ODM4:1 to support*/
+	uint32_t dcc_plane_width_limit;
 };
 
 struct dc_bug_wa {
diff --git a/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c b/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
index 5126d603f0b1..181041d6d177 100644
--- a/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
+++ b/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
@@ -829,6 +829,7 @@ bool hubbub401_get_dcc_compression_cap(struct hubbub *hubbub,
 		struct dc_surface_dcc_cap *output)
 {
 	struct dc *dc = hubbub->ctx->dc;
+	const unsigned int max_dcc_plane_width = dc->caps.dcc_plane_width_limit;
 	/* DCN4_Programming_Guide_DCHUB.docx, Section 5.11.2.2 */
 	enum dcc_control dcc_control;
 	unsigned int plane0_bpe, plane1_bpe;
@@ -843,6 +844,11 @@ bool hubbub401_get_dcc_compression_cap(struct hubbub *hubbub,
 	if (dc->debug.disable_dcc == DCC_DISABLE)
 		return false;
 
+	/* Conservatively disable DCC for cases where ODM4:1 may be required. */
+	if (max_dcc_plane_width != 0 &&
+			(input->surface_size.width > max_dcc_plane_width || input->plane1_size.width > max_dcc_plane_width))
+		return false;
+
 	switch (input->format) {
 	default:
 		is_dual_plane = false;
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
index 4e27d2cee9fb..a05a2209a44e 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
@@ -1822,6 +1822,9 @@ static bool dcn401_resource_construct(
 	dc->caps.extended_aux_timeout_support = true;
 	dc->caps.dmcub_support = true;
 
+	if (ASICREV_IS_GC_12_0_1_A0(dc->ctx->asic_id.hw_internal_rev))
+		dc->caps.dcc_plane_width_limit = 7680;
+
 	/* Color pipeline capabilities */
 	dc->caps.color.dpp.dcn_arch = 1;
 	dc->caps.color.dpp.input_lut_shared = 0;
-- 
2.34.1