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drm/amd/display: Guard against setting dispclk low for dcn31x

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[ Upstream commit 9c2f4ae64bb6f6d83a54d88b9ee0f369cdbb9fa8 ]

[WHY]
We should never apply a minimum dispclk value while in
prepare_bandwidth or while displays are active. This is
always an optimizaiton for when all displays are disabled.

[HOW]
Defer dispclk optimization until safe_to_lower = true
and display_count reaches 0.

Since 0 has a special value in this logic (ie. no dispclk
required) we also need adjust the logic that clamps it for
the actual request to PMFW.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Chris Park <chris.park@amd.com>
Reviewed-by: Eric Yang <eric.yang@amd.com>
Signed-off-by: Jing Zhou <Jing.Zhou@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jing Zhou
2025-03-04 23:15:56 +08:00
committed by Greg Kroah-Hartman
parent 3192d59fb7
commit 398c541ed0
2 changed files with 22 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_clk_mgr.c
View File

@@ -130,7 +130,7 @@ static void dcn315_update_clocks(struct clk_mgr *clk_mgr_base,
struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
struct dc_clocks *new_clocks = &context->bw_ctx.bw.dcn.clk;
struct dc *dc = clk_mgr_base->ctx->dc;
int display_count;
int display_count = 0;
bool update_dppclk = false;
bool update_dispclk = false;
bool dpp_clock_lowered = false;
@@ -204,14 +204,18 @@ static void dcn315_update_clocks(struct clk_mgr *clk_mgr_base,
update_dppclk = true;
}
if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz)) {
/* No need to apply the w/a if we haven't taken over from bios yet */
if (clk_mgr_base->clks.dispclk_khz)
if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz) &&
(new_clocks->dispclk_khz > 0 || (safe_to_lower && display_count == 0))) {
int requested_dispclk_khz = new_clocks->dispclk_khz;
dcn315_disable_otg_wa(clk_mgr_base, context, true);
/* Clamp the requested clock to PMFW based on their limit. */
if (dc->debug.min_disp_clk_khz > 0 && requested_dispclk_khz < dc->debug.min_disp_clk_khz)
requested_dispclk_khz = dc->debug.min_disp_clk_khz;
dcn315_smu_set_dispclk(clk_mgr, requested_dispclk_khz);
clk_mgr_base->clks.dispclk_khz = new_clocks->dispclk_khz;
dcn315_smu_set_dispclk(clk_mgr, clk_mgr_base->clks.dispclk_khz);
if (clk_mgr_base->clks.dispclk_khz)
dcn315_disable_otg_wa(clk_mgr_base, context, false);
update_dispclk = true;

13
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn316/dcn316_clk_mgr.c
View File

@@ -140,7 +140,7 @@ static void dcn316_update_clocks(struct clk_mgr *clk_mgr_base,
struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
struct dc_clocks *new_clocks = &context->bw_ctx.bw.dcn.clk;
struct dc *dc = clk_mgr_base->ctx->dc;
int display_count;
int display_count = 0;
bool update_dppclk = false;
bool update_dispclk = false;
bool dpp_clock_lowered = false;
@@ -211,11 +211,18 @@ static void dcn316_update_clocks(struct clk_mgr *clk_mgr_base,
update_dppclk = true;
}
if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz)) {
if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz) &&
(new_clocks->dispclk_khz > 0 || (safe_to_lower && display_count == 0))) {
int requested_dispclk_khz = new_clocks->dispclk_khz;
dcn316_disable_otg_wa(clk_mgr_base, context, safe_to_lower, true);
/* Clamp the requested clock to PMFW based on their limit. */
if (dc->debug.min_disp_clk_khz > 0 && requested_dispclk_khz < dc->debug.min_disp_clk_khz)
requested_dispclk_khz = dc->debug.min_disp_clk_khz;
dcn316_smu_set_dispclk(clk_mgr, requested_dispclk_khz);
clk_mgr_base->clks.dispclk_khz = new_clocks->dispclk_khz;
dcn316_smu_set_dispclk(clk_mgr, clk_mgr_base->clks.dispclk_khz);
dcn316_disable_otg_wa(clk_mgr_base, context, safe_to_lower, false);
update_dispclk = true;