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Subject[PATCH 5.4 191/434] drm/amd/display: correctly populate dpp refclk in fpga
Date
From: Anthony Koo <Anthony.Koo@amd.com>

[ Upstream commit 952f6c4b5d72d40f93f3deb61239290b357d434e ]

[Why]
In diags environment we are not programming the DPP DTO
correctly.

[How]
Populate the dpp refclk in dccg so it can be used to correctly
program DPP DTO.

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
index 3e8ac303bd52..23ec283eb07b 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
@@ -320,6 +320,8 @@ void dcn2_update_clocks_fpga(struct clk_mgr *clk_mgr,
struct dc_state *context,
bool safe_to_lower)
{
+ struct clk_mgr_internal *clk_mgr_int = TO_CLK_MGR_INTERNAL(clk_mgr);
+
struct dc_clocks *new_clocks = &context->bw_ctx.bw.dcn.clk;
/* Min fclk = 1.2GHz since all the extra scemi logic seems to run off of it */
int fclk_adj = new_clocks->fclk_khz > 1200000 ? new_clocks->fclk_khz : 1200000;
@@ -357,14 +359,18 @@ void dcn2_update_clocks_fpga(struct clk_mgr *clk_mgr,
clk_mgr->clks.dispclk_khz = new_clocks->dispclk_khz;
}

- /* Both fclk and dppclk ref are run on the same scemi clock so we
- * need to keep the same value for both
+ /* Both fclk and ref_dppclk run on the same scemi clock.
+ * So take the higher value since the DPP DTO is typically programmed
+ * such that max dppclk is 1:1 with ref_dppclk.
*/
if (clk_mgr->clks.fclk_khz > clk_mgr->clks.dppclk_khz)
clk_mgr->clks.dppclk_khz = clk_mgr->clks.fclk_khz;
if (clk_mgr->clks.dppclk_khz > clk_mgr->clks.fclk_khz)
clk_mgr->clks.fclk_khz = clk_mgr->clks.dppclk_khz;

+ // Both fclk and ref_dppclk run on the same scemi clock.
+ clk_mgr_int->dccg->ref_dppclk = clk_mgr->clks.fclk_khz;
+
dm_set_dcn_clocks(clk_mgr->ctx, &clk_mgr->clks);
}

--
2.20.1


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