From: Kevin Gao kevin.gao3@amd.com
[ Upstream commit d01a7306e1bec9c02268793f58144e3e42695bf0 ]
[Why] Due to very small clock register delta between DCN35 and DCN351, clock spread is being checked on the wrong register for DCN351, causing the display driver to believe that DPREFCLK downspread to be disabled when in some stacks it is enabled. This causes the clock values for audio to be incorrect.
[How] Both DCN351 and DCN35 use the same clk_mgr, so we modify the DCN35 function that checks for SSC enable to read CLK6 instead of CLK5 when using DCN351. This allows us to read for DPREFCLK downspread correctly so the clock can properly compensate when setting values.
Reviewed-by: Charlene Liu charlene.liu@amd.com Signed-off-by: Kevin Gao kevin.gao3@amd.com Signed-off-by: Roman Li roman.li@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 ---
**YES** This commit should be backported to stable kernel trees. Here's my detailed analysis: ## Bug Fix Classification This is a clear bug fix that addresses incorrect register reading for SSC (Spread Spectrum Clock) detection in DCN351. The commit fixes a fundamental hardware register access issue that causes incorrect audio clock values. ## Issue Severity The bug has significant functional impact: - **Audio functionality broken**: Incorrect clock values cause audio issues when DPREFCLK downspread is enabled - **Hardware-specific regression**: Affects DCN351 specifically due to register differences from DCN35 - **Silent failure**: The driver believes downspread is disabled when it's actually enabled, causing subtle but important timing issues ## Code Analysis The fix is minimal and targeted: 1. **New register definition**: Adds `mmCLK6_spll_field_8` for DCN351 in `dcn351_clk_mgr.c` 2. **Conditional logic**: In `dcn35_clk_mgr.c`, adds a DCN version check: ```c if (clk_mgr_base->ctx->dce_version == DCN_VERSION_3_51) { ssc_enable = REG_READ(CLK6_spll_field_8) & CLK6_spll_field_8__spll_ssc_en_MASK; } else { ssc_enable = REG_READ(CLK5_spll_field_8) & CLK5_spll_field_8__spll_ssc_en_MASK; } ``` 3. **Register addition**: Updates `clk_mgr_internal.h` to include the new register ## Risk Assessment - **Low regression risk**: The change is conditional based on DCN version, so it only affects DCN351 hardware - **Minimal code impact**: Very small, targeted change that doesn't affect other subsystems - **Hardware-specific**: Only impacts specific AMD DCN351 display hardware ## Comparison with Similar Commits Looking at the provided similar commits: - **Similar Commit #2 (YES)**: Also fixes incorrect register addresses causing SSC issues - very similar pattern - **Similar Commit #3 (YES)**: Addresses dprefclk adjustment with SS percentage - related audio timing issue This commit follows the exact same pattern as Similar Commit #2, which was marked for backporting and addresses nearly identical issues (incorrect register offset for SSC functionality). ## Stable Tree Criteria Met ✅ **Fixes important user- facing bug** (broken audio on DCN351) ✅ **Small, contained change** (minimal lines of code) ✅ **Low regression risk** (hardware-specific, conditional logic) ✅ **Clear hardware issue** (register offset correction) ✅ **Affects real users** (anyone with DCN351 hardware experiencing audio issues) The commit represents a critical hardware compatibility fix that should be available in stable kernels to ensure proper audio functionality on affected AMD hardware.
.../gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn351_clk_mgr.c | 1 + .../gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 8 +++++++- drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h | 3 ++- 3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn351_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn351_clk_mgr.c index 6a6ae618650b6..4607eff07253c 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn351_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn351_clk_mgr.c @@ -65,6 +65,7 @@ #define mmCLK1_CLK5_ALLOW_DS 0x16EB1
#define mmCLK5_spll_field_8 0x1B04B +#define mmCLK6_spll_field_8 0x1B24B #define mmDENTIST_DISPCLK_CNTL 0x0124 #define regDENTIST_DISPCLK_CNTL 0x0064 #define regDENTIST_DISPCLK_CNTL_BASE_IDX 1 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 1f47931c2dafc..cc205637e84b2 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 @@ -90,6 +90,7 @@ #define mmCLK1_CLK5_ALLOW_DS 0x16EB1
#define mmCLK5_spll_field_8 0x1B24B +#define mmCLK6_spll_field_8 0x1B24B #define mmDENTIST_DISPCLK_CNTL 0x0124 #define regDENTIST_DISPCLK_CNTL 0x0064 #define regDENTIST_DISPCLK_CNTL_BASE_IDX 1 @@ -116,6 +117,7 @@ #define DENTIST_DISPCLK_CNTL__DENTIST_DPPCLK_WDIVIDER_MASK 0x7F000000L
#define CLK5_spll_field_8__spll_ssc_en_MASK 0x00002000L +#define CLK6_spll_field_8__spll_ssc_en_MASK 0x00002000L
#define SMU_VER_THRESHOLD 0x5D4A00 //93.74.0 #undef FN @@ -589,7 +591,11 @@ static bool dcn35_is_spll_ssc_enabled(struct clk_mgr *clk_mgr_base)
uint32_t ssc_enable;
- ssc_enable = REG_READ(CLK5_spll_field_8) & CLK5_spll_field_8__spll_ssc_en_MASK; + if (clk_mgr_base->ctx->dce_version == DCN_VERSION_3_51) { + ssc_enable = REG_READ(CLK6_spll_field_8) & CLK6_spll_field_8__spll_ssc_en_MASK; + } else { + ssc_enable = REG_READ(CLK5_spll_field_8) & CLK5_spll_field_8__spll_ssc_en_MASK; + }
return ssc_enable != 0; } diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h index 221645c023b50..bac8febad69a5 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h +++ b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr_internal.h @@ -199,6 +199,7 @@ enum dentist_divider_range { CLK_SR_DCN35(CLK1_CLK4_ALLOW_DS), \ CLK_SR_DCN35(CLK1_CLK5_ALLOW_DS), \ CLK_SR_DCN35(CLK5_spll_field_8), \ + CLK_SR_DCN35(CLK6_spll_field_8), \ SR(DENTIST_DISPCLK_CNTL), \
#define CLK_COMMON_MASK_SH_LIST_DCN32(mask_sh) \ @@ -307,7 +308,7 @@ struct clk_mgr_registers { uint32_t CLK1_CLK4_ALLOW_DS; uint32_t CLK1_CLK5_ALLOW_DS; uint32_t CLK5_spll_field_8; - + uint32_t CLK6_spll_field_8; };
struct clk_mgr_shift {