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| author | Uma Shankar <uma.shankar@intel.com> | 2024-05-09 11:05:08 +0530 |
|---|---|---|
| committer | Uma Shankar <uma.shankar@intel.com> | 2024-05-13 21:18:48 +0530 |
| commit | 56c12ec72ae8bd90cce1ea59dba2b93f986606be (patch) | |
| tree | 8536cccbc1abf72b41f92c3ae6ff15d35417efdd /drivers/gpu/drm/i915/display/intel_snps_phy.c | |
| parent | 84ceb14076592abd08d06d403ebe18aa60d5d505 (diff) | |
| download | linux-56c12ec72ae8bd90cce1ea59dba2b93f986606be.tar.gz linux-56c12ec72ae8bd90cce1ea59dba2b93f986606be.tar.bz2 linux-56c12ec72ae8bd90cce1ea59dba2b93f986606be.zip | |
drm/i915: Implement Audio WA_14020863754
WA_14020863754: Corner case with Min Hblank Fix can cause
audio hang
Issue: Previously a fix was made to avoid issues with extremely
small hblanks, called the "Min Hblank Fix". However, this can
potentially cause an audio hang.
Workaround :
During "Audio Programming Sequence" Audio Enabling -
When DP mode is enabled Set mmio offset 0x65F1C bit 18 = 1b,
before step #1 "Enable audio Presence Detect"
During "Audio Programming Sequence" Audio Disabling -
When DP mode is enabled Clear mmio offset 0x65F1C bit 18 = 0b,
after step #6 "Disable Audio PD (Presence Detect)"
If not clearing PD bit, must also not clear 0x65F1C bit 18 (leave = 1b)
v2: Update the platform checks (Jani Nikula)
v3: Limited the WA to LNL and BMG, added a helper (Matt Roper)
v4: Updated the bit naming, fixed redundant if statement
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240509053508.2807834-1-uma.shankar@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_snps_phy.c')
0 files changed, 0 insertions, 0 deletions