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SubjectRe: [PATCH V4 5/7] mmc: sdhci: add Auto CMD Auto Select support
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On 23/07/18 13:08, Chunyan Zhang wrote:
> As SD Host Controller Specification v4.10 documents:
> Host Controller Version 4.10 defines this "Auto CMD Auto Select" mode.
> Selection of Auto CMD depends on setting of CMD23 Enable in the Host
> Control 2 register which indicates whether card supports CMD23. If CMD23
> Enable =1, Auto CMD23 is used and if CMD23 Enable =0, Auto CMD12 is
> used. In case of Version 4.10 or later, use of Auto CMD Auto Select is
> recommended rather than use of Auto CMD12 Enable or Auto CMD23
> Enable.
>
> This patch add this new mode support.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
> ---
> drivers/mmc/host/sdhci.c | 61 +++++++++++++++++++++++++++++++++++++++---------
> drivers/mmc/host/sdhci.h | 2 ++
> 2 files changed, 52 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 5acea3d..5c60590 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -311,6 +311,23 @@ static void sdhci_config_dma(struct sdhci_host *host)
> sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> }
>
> +static void sdhci_enable_cmd23(struct sdhci_host *host)
> +{
> + u16 ctrl2;
> +
> + /*
> + * This is used along with "Auto CMD Auto Select" feature,
> + * which is introduced from v4.10, if card supports CMD23,
> + * Auto CMD23 should be used instead of Auto CMD12.
> + */
> + if (host->version >= SDHCI_SPEC_410 &&
> + (host->mmc->caps & MMC_CAP_CMD23)) {

That is the host capability. It needs to be the card capability.

> + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + ctrl2 |= SDHCI_CMD23_ENABLE;
> + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
> + }
> +}
> +
> static void sdhci_init(struct sdhci_host *host, int soft)
> {
> struct mmc_host *mmc = host->mmc;
> @@ -329,6 +346,8 @@ static void sdhci_init(struct sdhci_host *host, int soft)
> host->clock = 0;
> mmc->ops->set_ios(mmc, &mmc->ios);
> }
> +
> + sdhci_enable_cmd23(host);
> }
>
> static void sdhci_reinit(struct sdhci_host *host)
> @@ -1093,6 +1112,36 @@ static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
> !mrq->cap_cmd_during_tfr;
> }
>
> +static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
> + struct mmc_command *cmd,
> + u16 *mode)
> +{
> + bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
> + (cmd->opcode != SD_IO_RW_EXTENDED);
> + bool use_cmd23 = cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
> +
> + /*
> + * In case of Version 4.10 or later, use of 'Auto CMD Auto
> + * Select' is recommended rather than use of 'Auto CMD12
> + * Enable' or 'Auto CMD23 Enable'.
> + */
> + if (host->version >= SDHCI_SPEC_410 && (use_cmd12 || use_cmd23)) {
> + *mode |= SDHCI_TRNS_AUTO_SEL;

As noted in patch 4, the CMD23 argument is not just the block count for eMMC.

> + return;
> + }
> +
> + /*
> + * If we are sending CMD23, CMD12 never gets sent
> + * on successful completion (so no Auto-CMD12).
> + */
> + if (use_cmd12) {
> + *mode |= SDHCI_TRNS_AUTO_CMD12;
> + } else if (use_cmd23) {
> + *mode |= SDHCI_TRNS_AUTO_CMD23;
> + sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
> + }
> +}
> +
> static void sdhci_set_transfer_mode(struct sdhci_host *host,
> struct mmc_command *cmd)
> {
> @@ -1119,17 +1168,7 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
>
> if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
> mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
> - /*
> - * If we are sending CMD23, CMD12 never gets sent
> - * on successful completion (so no Auto-CMD12).
> - */
> - if (sdhci_auto_cmd12(host, cmd->mrq) &&
> - (cmd->opcode != SD_IO_RW_EXTENDED))
> - mode |= SDHCI_TRNS_AUTO_CMD12;
> - else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
> - mode |= SDHCI_TRNS_AUTO_CMD23;
> - sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
> - }
> + sdhci_auto_cmd_select(host, cmd, &mode);
> }
>
> if (data->flags & MMC_DATA_READ)
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 81aae07..a8f4ec2 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -42,6 +42,7 @@
> #define SDHCI_TRNS_BLK_CNT_EN 0x02
> #define SDHCI_TRNS_AUTO_CMD12 0x04
> #define SDHCI_TRNS_AUTO_CMD23 0x08
> +#define SDHCI_TRNS_AUTO_SEL 0x0C
> #define SDHCI_TRNS_READ 0x10
> #define SDHCI_TRNS_MULTI 0x20
>
> @@ -185,6 +186,7 @@
> #define SDHCI_CTRL_DRV_TYPE_D 0x0030
> #define SDHCI_CTRL_EXEC_TUNING 0x0040
> #define SDHCI_CTRL_TUNED_CLK 0x0080
> +#define SDHCI_CMD23_ENABLE 0x0800
> #define SDHCI_CTRL_V4_MODE 0x1000
> #define SDHCI_CTRL_64BIT_ADDR 0x2000
> #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000
>

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