[PATCH v6 0/5] mmc: sdhci-msm: Rectify DLL programming sequence

Ram Prakash Gupta
2025-12-15T12:00:26Z

With the current DLL sequence stability issues are seen in
HS400 and HS200 mode for data transfers.

Rectify the DLL programming sequence as per latest hardware
programming guide and also incorporate support for HS200 and
HS400 DLL settings using the device tree.

Changes from v5:
1. Addressed Adrian Hunter's comments:
a. SDHCI_HS400_TUNING flag handling
b. Use of readl_relaxed_poll_timeout api instead of loop.
c. Reording of variables.
2. Krzysztof's request for DTS user.

Changes from v4:
1. Addressed Rob Herrirng & Konrad Dybcio comments:
a. Regarding naming of dt entry.
2. Addressed Adrian Hunter comments:
a. Regarding parsing of dt and storing variable in driver.
3. Additional change:
a. Changes in patch 4/4 according to parsing change.

Changes from v3:
1. Addressed Dmitry Baryshkov comments:
a. Regarding clk division by in V2 patchset
2. Addressed Konrad Dybcio comments:
a. Renaming of parameters
b. Memory allocation
c. couldn't address __free, as didn't fit here
3. Addressed Krzysztof Kozlowsk comment:
a. Regarding the dt binding
b. commit message to reflect the need of dt
4. Additional change:
a. DT parsing logic
b. Maintain backward compatibility

Changes from v2:
1. Addressed Dmitry Baryshkov comments:
a. Regarding TCXO frequency.
b. Regarding clock rate.
c. regarding checkpatch.

Changes from v1:
1. Addressed Tengfei Fan comment, added missing semicolocon
in sdhci_msm_host structure.

Ram Prakash Gupta (1):
arm64: dts: qcom: Add sdhc dll-presets

Sachin Gupta (4):
dt-bindings: mmc: Add dll-presets values for HS400 and HS200 modes
mmc: sdhci-msm: Add core_major, minor to msm_host structure
mmc: sdhci-msm: Add Device tree parsing logic for DLL settings
mmc: sdhci-msm: Rectify DLL programming sequence for SDCC

.../devicetree/bindings/mmc/sdhci-msm.yaml | 5 +
arch/arm64/boot/dts/qcom/qdu1000.dtsi | 4 +-
drivers/mmc/host/sdhci-msm.c | 324 +++++++++++++++++-
3 files changed, 314 insertions(+), 19 deletions(-)

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2.34.1