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charset="utf-8" Introduce a flag to indicate if the Qualcomm platform has a level shifter for SD cards. With level shifter addition some extra delay is seen on RX data path leading to CRC errors. To compensate these delays and avoid CRC errors below things needs to be done: 1) Enable tuning for SDR50 mode 2) Limit HS mode frequency to 37.5MHz from 50MHz Add this flag for all targets with a level shifter to handle these issues for SD card. Signed-off-by: Sarthak Garg --- Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documen= tation/devicetree/bindings/mmc/sdhci-msm.yaml index b32253c60919..14f1ec9ae5bd 100644 --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml @@ -131,6 +131,9 @@ properties: $ref: /schemas/types.yaml#/definitions/uint32 description: platform specific settings for DLL_CONFIG reg. =20 + qcom,use-level-shifter: + description: Flag to indicate if platform has level shifter for SD car= d. + iommus: minItems: 1 maxItems: 8 --=20 2.17.1 From nobody Sun Nov 24 04:07:19 2024 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE7D91D54D3; Thu, 7 Nov 2024 08:05:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" For Qualcomm SoCs which needs level shifter for SD card, extra delay is seen on receiver data path. To compensate this delay enable tuning for SDR50 mode for targets which has level shifter. Signed-off-by: Sarthak Garg --- drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index e00208535bd1..16325c21de52 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -81,6 +81,7 @@ #define CORE_IO_PAD_PWR_SWITCH_EN BIT(15) #define CORE_IO_PAD_PWR_SWITCH BIT(16) #define CORE_HC_SELECT_IN_EN BIT(18) +#define CORE_HC_SELECT_IN_SDR50 (4 << 19) #define CORE_HC_SELECT_IN_HS400 (6 << 19) #define CORE_HC_SELECT_IN_MASK (7 << 19) =20 @@ -1124,6 +1125,10 @@ static bool sdhci_msm_is_tuning_needed(struct sdhci_= host *host) { struct mmc_ios *ios =3D &host->mmc->ios; =20 + if (ios->timing =3D=3D MMC_TIMING_UHS_SDR50 && + host->flags & SDHCI_SDR50_NEEDS_TUNING) + return true; + /* * Tuning is required for SDR104, HS200 and HS400 cards and * if clock frequency is greater than 100MHz in these modes. @@ -1192,6 +1197,8 @@ static int sdhci_msm_execute_tuning(struct mmc_host *= mmc, u32 opcode) struct mmc_ios ios =3D host->mmc->ios; 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charset="utf-8" For Qualcomm SoCs with level shifter delays are seen on receivers data path due to latency added by level shifter. To bring these delays in normal range and avoid CMD CRC errors reduce frequency for HS mode SD cards to 37.5MHz for targets which has level shifter. Signed-off-by: Sarthak Garg --- drivers/mmc/host/sdhci-msm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 16325c21de52..5e1dc06c4707 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -138,6 +138,8 @@ /* Max load for eMMC Vdd-io supply */ #define MMC_VQMMC_MAX_LOAD_UA 325000 =20 +#define LEVEL_SHIFTER_HIGH_SPEED_FREQ 37500000 + #define msm_host_readl(msm_host, host, offset) \ msm_host->var_ops->msm_readl_relaxed(host, offset) =20 @@ -287,6 +289,7 @@ struct sdhci_msm_host { bool use_cdr; u32 transfer_mode; bool updated_ddr_cfg; + bool uses_level_shifter; bool uses_tassadar_dll; u32 dll_config; u32 ddr_config; @@ -366,6 +369,11 @@ static void msm_set_clock_rate_for_bus_mode(struct sdh= ci_host *host, =20 mult =3D msm_get_clock_mult_for_bus_mode(host); desired_rate =3D clock * mult; + + if (curr_ios.timing =3D=3D MMC_TIMING_SD_HS && desired_rate =3D=3D 500000= 00 + && msm_host->uses_level_shifter) + desired_rate =3D LEVEL_SHIFTER_HIGH_SPEED_FREQ; + rc =3D dev_pm_opp_set_rate(mmc_dev(host->mmc), desired_rate); if (rc) { pr_err("%s: Failed to set clock at rate %u at timing %d\n", @@ -2372,6 +2380,8 @@ static inline void sdhci_msm_get_of_property(struct p= latform_device *pdev, =20 of_property_read_u32(node, "qcom,dll-config", &msm_host->dll_config); =20 + msm_host->uses_level_shifter =3D of_property_read_bool(node, "qcom,use-le= vel-shifter"); + if (of_device_is_compatible(node, "qcom,msm8916-sdhci")) host->quirks2 |=3D SDHCI_QUIRK2_BROKEN_64_BIT_DMA; } --=20 2.17.1