linux-kernel - Re: [PATCH] mmc: sdhci-msm: Correct the offset and value for DDR

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Date:   Tue, 10 Dec 2019 10:51:12 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Sayali Lokhande <sayalil@...eaurora.org>, cang@...eaurora.org,
        Ram Prakash Gupta <rampraka@...eaurora.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-msm: Correct the offset and value for
 DDR_CONFIG register

On Tue, 26 Nov 2019 at 11:19, Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
>
> The DDR_CONFIG register offset got updated after a specific
> minor version of sdcc V4. This offset change has not been properly
> taken care of while updating register changes for sdcc V5.
>
> Correcting proper offset for this register.
> Also updating this register value to reflect the recommended RCLK
> delay.
>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>

I have applied this for fixes, however it seems like this should also
be tagged for stable, right?

Is there a specific commit this fixes or should we just find the
version it applies to?


Kind regards
Uffe



> ---
>  drivers/mmc/host/sdhci-msm.c | 28 +++++++++++++++++++---------
>  1 file changed, 19 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index b75c82d..3d0bb5e 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -99,7 +99,7 @@
>
>  #define CORE_PWRSAVE_DLL       BIT(3)
>
> -#define DDR_CONFIG_POR_VAL     0x80040853
> +#define DDR_CONFIG_POR_VAL     0x80040873
>
>
>  #define INVALID_TUNING_PHASE   -1
> @@ -148,8 +148,9 @@ struct sdhci_msm_offset {
>         u32 core_ddr_200_cfg;
>         u32 core_vendor_spec3;
>         u32 core_dll_config_2;
> +       u32 core_dll_config_3;
> +       u32 core_ddr_config_old; /* Applicable to sdcc minor ver < 0x49 */
>         u32 core_ddr_config;
> -       u32 core_ddr_config_2;
>  };
>
>  static const struct sdhci_msm_offset sdhci_msm_v5_offset = {
> @@ -177,8 +178,8 @@ struct sdhci_msm_offset {
>         .core_ddr_200_cfg = 0x224,
>         .core_vendor_spec3 = 0x250,
>         .core_dll_config_2 = 0x254,
> -       .core_ddr_config = 0x258,
> -       .core_ddr_config_2 = 0x25c,
> +       .core_dll_config_3 = 0x258,
> +       .core_ddr_config = 0x25c,
>  };
>
>  static const struct sdhci_msm_offset sdhci_msm_mci_offset = {
> @@ -207,8 +208,8 @@ struct sdhci_msm_offset {
>         .core_ddr_200_cfg = 0x184,
>         .core_vendor_spec3 = 0x1b0,
>         .core_dll_config_2 = 0x1b4,
> -       .core_ddr_config = 0x1b8,
> -       .core_ddr_config_2 = 0x1bc,
> +       .core_ddr_config_old = 0x1b8,
> +       .core_ddr_config = 0x1bc,
>  };
>
>  struct sdhci_msm_variant_ops {
> @@ -253,6 +254,7 @@ struct sdhci_msm_host {
>         const struct sdhci_msm_offset *offset;
>         bool use_cdr;
>         u32 transfer_mode;
> +       bool updated_ddr_cfg;
>  };
>
>  static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
> @@ -924,8 +926,10 @@ static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
>  static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
>  {
>         struct mmc_host *mmc = host->mmc;
> -       u32 dll_status, config;
> +       u32 dll_status, config, ddr_cfg_offset;
>         int ret;
> +       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +       struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>         const struct sdhci_msm_offset *msm_offset =
>                                         sdhci_priv_msm_offset(host);
>
> @@ -938,8 +942,11 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
>          * bootloaders. In the future, if this changes, then the desired
>          * values will need to be programmed appropriately.
>          */
> -       writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr +
> -                       msm_offset->core_ddr_config);
> +       if (msm_host->updated_ddr_cfg)
> +               ddr_cfg_offset = msm_offset->core_ddr_config;
> +       else
> +               ddr_cfg_offset = msm_offset->core_ddr_config_old;
> +       writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr + ddr_cfg_offset);
>
>         if (mmc->ios.enhanced_strobe) {
>                 config = readl_relaxed(host->ioaddr +
> @@ -1899,6 +1906,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>                                 msm_offset->core_vendor_spec_capabilities0);
>         }
>
> +       if (core_major == 1 && core_minor >= 0x49)
> +               msm_host->updated_ddr_cfg = true;
> +
>         /*
>          * Power on reset state may trigger power irq if previous status of
>          * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
> --
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>