[PATCH AUTOSEL 6.0 56/73] drm/amd/display: Fix DTBCLK disable requests and SRC_SEL programming

Sasha Levin
2022-12-18T16:33:31Z

From: Alvin Lee <Alvin.Lee2@amd.com>

[ Upstream commit f6015da7f2410109bd2ccd2e2828f26185aeb81d ]

[Description]
- When transitioning FRL / DP2 is not required, we will always request
DTBCLK = 0Mhz, but PMFW returns the min freq
- This causes us to make DTBCLK requests every time we call optimize
after transitioning from FRL to non-FRL
- If DTBCLK is not required, request the min instead (then we only need
to make 1 extra request at boot time)
- Also when programming PIPE_DTO_SRC_SEL, don't programming for DP
first, just programming once for the required selection (programming
DP on an HDMI connection then switching back causes corruption)

Reviewed-by: Dillon Varone <Dillon.Varone@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c | 2 +-
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c | 6 +-----
2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
index e7f1d5f8166f..59a29c32f66a 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
@@ -436,7 +436,7 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base,
}

if (!new_clocks->dtbclk_en) {
- new_clocks->ref_dtbclk_khz = 0;
+ new_clocks->ref_dtbclk_khz = clk_mgr_base->bw_params->clk_table.entries[0].dtbclk_mhz * 1000;
}

/* clock limits are received with MHz precision, divide by 1000 to prevent setting clocks at every call */
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
index 6dd8dadd68a5..6f160f65c8fa 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
@@ -225,11 +225,7 @@ void dccg32_set_dtbclk_dto(
} else {
REG_UPDATE_2(OTG_PIXEL_RATE_CNTL[params->otg_inst],
DTBCLK_DTO_ENABLE[params->otg_inst], 0,
- PIPE_DTO_SRC_SEL[params->otg_inst], 1);
- if (params->is_hdmi)
- REG_UPDATE(OTG_PIXEL_RATE_CNTL[params->otg_inst],
- PIPE_DTO_SRC_SEL[params->otg_inst], 0);
-
+ PIPE_DTO_SRC_SEL[params->otg_inst], params->is_hdmi ? 0 : 1);
REG_WRITE(DTBCLK_DTO_MODULO[params->otg_inst], 0);
REG_WRITE(DTBCLK_DTO_PHASE[params->otg_inst], 0);
}
--
2.35.1