diff options
| author | Hoang Pham <hopham@nvidia.com> | 2010-08-03 17:28:23 -0700 |
|---|---|---|
| committer | Gary King <gking@nvidia.com> | 2010-08-04 09:03:46 -0700 |
| commit | 6153e3f3c3aa0e2893cb3e576cd8442b0eafacc3 (patch) | |
| tree | 7e244a9b775711d33c4d229212f85605faaab479 | |
| parent | 25a04a4278106ad5925795a7dc855e7335a18ceb (diff) | |
tegra odm pmu: Add missing setting settle time for HDMI DDC
There is missing setting settle time for HDMI DDC after enable.
This is causing EDID read fail for some TVs on Harmony platform
due to this power rail not stable after enable. After measured
from scope, there is required at least 500us to make HDMI DDC
stable after enable.
Bug 710476
Change-Id: Ia3641896a36bce3fe9d7dda44a48721f324afb6a
Reviewed-on: http://git-master/r/4737
Tested-by: Hoang Pham <hopham@nvidia.com>
Reviewed-by: Chih-Lung Huang <lhuang@nvidia.com>
Reviewed-by: Gary King <gking@nvidia.com>
| -rw-r--r-- | arch/arm/mach-tegra/odm_kit/adaptations/pmu/tps6586x/nvodm_pmu_tps6586x.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/odm_kit/adaptations/pmu/tps6586x/nvodm_pmu_tps6586x.c b/arch/arm/mach-tegra/odm_kit/adaptations/pmu/tps6586x/nvodm_pmu_tps6586x.c index 515a4471c6ac..0a4769ae8866 100644 --- a/arch/arm/mach-tegra/odm_kit/adaptations/pmu/tps6586x/nvodm_pmu_tps6586x.c +++ b/arch/arm/mach-tegra/odm_kit/adaptations/pmu/tps6586x/nvodm_pmu_tps6586x.c @@ -1176,6 +1176,17 @@ Tps6586xWriteVoltageReg( pSupplyInfo->supply, NV_TRUE); status = Tps6586xSetExternalSupply(hDevice, vddRail, NV_TRUE); + /* EDID read will fail if power rail HDMI 5V DDC is not stable + * after enable. After measured from scope, there is required + * at least 500us to make this power rail stable. + */ + if (vddRail == Ext_TPS2051BPmuSupply_VDDIO_VID) + { + if (pSettleMicroSeconds) + *pSettleMicroSeconds = 500; + else + NvOdmOsWaitUS(500); + } } } else |