linux-kernel - Re: [PATCH v3 1/2] mmc: tegra: disable UHS modes

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Message-ID: <CAPDyKFpt98rbFpvu1uzbOuhCTrO96hzQU2VwNRgJGfoi_7F-OA@mail.gmail.com>
Date:	Fri, 23 May 2014 09:03:33 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Chris Ball <chris@...ntf.net>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/2] mmc: tegra: disable UHS modes

On 22 May 2014 17:55, Andrew Bresticker <abrestic@...omium.org> wrote:
> Program TEGRA_SDHCI_VENDOR_MISC_CTRL so that UHS modes aren't advertised
> in SDHCI_CAPABILITIES_1.  While the Tegra SDHCI controller does support
> these modes, they require Tegra-specific tuning and calibration routines
> which the driver does not support yet.
>
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> Tested-by: Stephen Warren <swarren@...dia.com>
> Acked-by: Stephen Warren <swarren@...dia.com>

Thanks Andrew!

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Chris, can you pick this up?

Kind regards
Ulf Hansson

> ---
> Changes from v2:
>  - rebased on mmc-next
> No changes from v1
> ---
>  drivers/mmc/host/sdhci-tegra.c | 30 +++++++++++++++++++++++-------
>  1 file changed, 23 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 9852476..4375cd4 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -32,11 +32,17 @@
>
>  /* Tegra SDHOST controller vendor register definitions */
>  #define SDHCI_TEGRA_VENDOR_MISC_CTRL           0x120
> +#define SDHCI_MISC_CTRL_ENABLE_SDR104          0x8
> +#define SDHCI_MISC_CTRL_ENABLE_SDR50           0x10
>  #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300  0x20
> +#define SDHCI_MISC_CTRL_ENABLE_DDR50           0x200
>
>  #define NVQUIRK_FORCE_SDHCI_SPEC_200   BIT(0)
>  #define NVQUIRK_ENABLE_BLOCK_GAP_DET   BIT(1)
>  #define NVQUIRK_ENABLE_SDHCI_SPEC_300  BIT(2)
> +#define NVQUIRK_DISABLE_SDR50          BIT(3)
> +#define NVQUIRK_DISABLE_SDR104         BIT(4)
> +#define NVQUIRK_DISABLE_DDR50          BIT(5)
>
>  struct sdhci_tegra_soc_data {
>         const struct sdhci_pltfm_data *pdata;
> @@ -100,20 +106,25 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>         struct sdhci_tegra *tegra_host = pltfm_host->priv;
>         const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
> +       u32 misc_ctrl;
>
>         sdhci_reset(host, mask);
>
>         if (!(mask & SDHCI_RESET_ALL))
>                 return;
>
> +       misc_ctrl = sdhci_readw(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>         /* Erratum: Enable SDHCI spec v3.00 support */
> -       if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) {
> -               u32 misc_ctrl;
> -
> -               misc_ctrl = sdhci_readb(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
> +       if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300)
>                 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
> -               sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
> -       }
> +       /* Don't advertise UHS modes which aren't supported yet */
> +       if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR50)
> +               misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR50;
> +       if (soc_data->nvquirks & NVQUIRK_DISABLE_DDR50)
> +               misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_DDR50;
> +       if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR104)
> +               misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
> +       sdhci_writew(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>  }
>
>  static void tegra_sdhci_set_bus_width(struct sdhci_host *host, int bus_width)
> @@ -170,7 +181,9 @@ static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
>
>  static struct sdhci_tegra_soc_data soc_data_tegra30 = {
>         .pdata = &sdhci_tegra30_pdata,
> -       .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300,
> +       .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 |
> +                   NVQUIRK_DISABLE_SDR50 |
> +                   NVQUIRK_DISABLE_SDR104,
>  };
>
>  static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
> @@ -184,6 +197,9 @@ static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
>
>  static struct sdhci_tegra_soc_data soc_data_tegra114 = {
>         .pdata = &sdhci_tegra114_pdata,
> +       .nvquirks = NVQUIRK_DISABLE_SDR50 |
> +                   NVQUIRK_DISABLE_DDR50 |
> +                   NVQUIRK_DISABLE_SDR104,
>  };
>
>  static const struct of_device_id sdhci_tegra_dt_match[] = {
> --
> 1.9.1.423.g4596e3a
>
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