linux-kernel - [PATCH v4 0/4] mmc: sdhci-msm: Rectify DLL programming sequence for SDCC

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Message-Id: <20250929113515.26752-1-quic_rampraka@quicinc.com>
Date: Mon, 29 Sep 2025 17:05:11 +0530
From: Ram Prakash Gupta <quic_rampraka@...cinc.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dmitry.baryshkov@....qualcomm.com, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sayalil@...cinc.com,
        quic_nitirawa@...cinc.com, quic_bhaskarv@...cinc.com,
        kernel@....qualcomm.com, Ram Prakash Gupta <rampraka@....qualcomm.com>
Subject: [PATCH v4 0/4] mmc: sdhci-msm: Rectify DLL programming sequence for SDCC 

From: Ram Prakash Gupta <rampraka@....qualcomm.com>

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 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.

Sachin Gupta (4):
  dt-bindings: mmc: Add dll-hsr-list 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 +
 drivers/mmc/host/sdhci-msm.c                  | 368 +++++++++++++++++-
 2 files changed, 354 insertions(+), 19 deletions(-)

-- 
2.34.1