On few SDHCI-MSM controllers, the host controller's clock tuning circuit may go out of sync if controller clocks are gated which eventually, result in data CRC and command CRC/timeout errors. To fix this issue, the DLL needs to be re-initialized and restored with its old settings once clocks are ungated. SDHC cotroller on SDM845 SOC has this limitation. Changes since V4: - Exactly same as V3, posted multiple mails for V4. So to avoid confusion updating it as V5. Changes since V3: - Introduced SoC specific dt compatible string for sdhci-msm controller - Moved the condition which checks whether tuning is needed or not, to a common function. Changes since V2: - Removed an unused variable. - Renamed the newly introduced flags to be more meaningful. - Added new dt compatible string for SDM845 SOC. Changes since V1: - Replaced dt flag with a dt compatible string to indicate SHDCI-MSM controller varients which need this fix. - Moved the DLL settings restoration logic from request context to platform driver runtime pm context. Tested on: sdm845 Veerabhadrarao Badiganti (2): dt-bindings: mmc: sdhci-msm: Add SoC-specific compatible strings mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically .../devicetree/bindings/mmc/sdhci-msm.txt | 21 ++++-- drivers/mmc/host/sdhci-msm.c | 78 +++++++++++++++++++--- 2 files changed, 84 insertions(+), 15 deletions(-) -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
