diff options
| author | Charlene Liu <Charlene.Liu@amd.com> | 2025-11-25 09:51:28 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-01 11:43:40 +0100 |
| commit | 467904aabbfd761c475e9408f081d5476c0773c5 (patch) | |
| tree | 0b6831639a105f14197b911155ba65aaa5ec4f15 /drivers/gpu/drm/amd | |
| parent | 7c2d68e091584149fe89bcbaf9b99b3162d46ee7 (diff) | |
| download | linux-467904aabbfd761c475e9408f081d5476c0773c5.tar.gz linux-467904aabbfd761c475e9408f081d5476c0773c5.tar.bz2 linux-467904aabbfd761c475e9408f081d5476c0773c5.zip | |
drm/amd/display: avoid reset DTBCLK at clock init
[ Upstream commit 0ae47e971b9add8f7b8f8d55ac5f407f6f346758 ]
[why & how]
this is to init to HW real DTBCLK.
and use real HW DTBCLK status to update internal logic state
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Martin Leung <martin.leung@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Ausef Yousof <Ausef.Yousof@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: cfa0904a35fd ("drm/amd/display: Prevent Gating DTBCLK before It Is Properly Latched")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c index a4ac601a30c3..3114b3fae9ef 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c @@ -393,6 +393,7 @@ void dcn35_update_clocks(struct clk_mgr *clk_mgr_base, if (clk_mgr_base->clks.dtbclk_en && !new_clocks->dtbclk_en) { if (clk_mgr->base.ctx->dc->config.allow_0_dtb_clk) dcn35_smu_set_dtbclk(clk_mgr, false); + clk_mgr_base->clks.dtbclk_en = new_clocks->dtbclk_en; } /* check that we're not already in lower */ @@ -410,11 +411,17 @@ void dcn35_update_clocks(struct clk_mgr *clk_mgr_base, } if (!clk_mgr_base->clks.dtbclk_en && new_clocks->dtbclk_en) { - dcn35_smu_set_dtbclk(clk_mgr, true); - clk_mgr_base->clks.dtbclk_en = new_clocks->dtbclk_en; + int actual_dtbclk = 0; dcn35_update_clocks_update_dtb_dto(clk_mgr, context, new_clocks->ref_dtbclk_khz); - clk_mgr_base->clks.ref_dtbclk_khz = new_clocks->ref_dtbclk_khz; + dcn35_smu_set_dtbclk(clk_mgr, true); + + actual_dtbclk = REG_READ(CLK1_CLK4_CURRENT_CNT); + + if (actual_dtbclk) { + clk_mgr_base->clks.ref_dtbclk_khz = new_clocks->ref_dtbclk_khz; + clk_mgr_base->clks.dtbclk_en = new_clocks->dtbclk_en; + } } /* check that we're not already in D0 */ @@ -581,12 +588,10 @@ static bool dcn35_is_spll_ssc_enabled(struct clk_mgr *clk_mgr_base) static void init_clk_states(struct clk_mgr *clk_mgr) { - struct clk_mgr_internal *clk_mgr_int = TO_CLK_MGR_INTERNAL(clk_mgr); uint32_t ref_dtbclk = clk_mgr->clks.ref_dtbclk_khz; + memset(&(clk_mgr->clks), 0, sizeof(struct dc_clocks)); - if (clk_mgr_int->smu_ver >= SMU_VER_THRESHOLD) - clk_mgr->clks.dtbclk_en = true; // request DTBCLK disable on first commit clk_mgr->clks.ref_dtbclk_khz = ref_dtbclk; // restore ref_dtbclk clk_mgr->clks.p_state_change_support = true; clk_mgr->clks.prev_p_state_change_support = true; @@ -597,6 +602,7 @@ static void init_clk_states(struct clk_mgr *clk_mgr) void dcn35_init_clocks(struct clk_mgr *clk_mgr) { struct clk_mgr_internal *clk_mgr_int = TO_CLK_MGR_INTERNAL(clk_mgr); + init_clk_states(clk_mgr); // to adjust dp_dto reference clock if ssc is enable otherwise to apply dprefclk |