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SubjectRe: [PATCH V3 5/7] mmc: sdhci: add Auto CMD Auto Select support
On 17 July 2018 at 19:16, Adrian Hunter <adrian.hunter@intel.com> wrote:
> On 09/07/18 06:19, 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 | 39 ++++++++++++++++++++++++++++-----------
>> drivers/mmc/host/sdhci.h | 2 ++
>> 2 files changed, 30 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index f64e766..1ca3871 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -1033,6 +1033,33 @@ static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
>> !mrq->cap_cmd_during_tfr;
>> }
>>
>> +static inline void sdhci_auto_cmd_enable(struct sdhci_host *host,
>> + struct mmc_command *cmd,
>> + u16 *mode)
>> +{
>> + /*
>> + * 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) {
>> + *mode |= SDHCI_TRNS_AUTO_SEL;
>
> The rules for selecting auto commands still need to be applied. In effect:
>
> if (sdhci_auto_cmd12(host, cmd->mrq) &&
> (cmd->opcode != SD_IO_RW_EXTENDED)) {
> *mode |= SDHCI_TRNS_AUTO_SEL;
> } else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
> *mode |= SDHCI_TRNS_AUTO_SEL;
> sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);

The fact seems that SDHCI_TRNS_AUTO_SEL mode don't need
SDHCI_ARGUMENT2 register being written. The test result on my board
showed that mounting a blk partition would fail due to lack of a
hardware interrupt if SDHCI_ARGUMENT2 was set like above.

> }
>
> Also the selection of Host Control 2 register CMD23 Enable should be done by
> SDHCI (if supported by the card) not the Spreadtrum driver.

Ok.

>
>> + return;
>> + }
>> +
>> + /*
>> + * 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);
>> + }
>> +}
>> +
>> static void sdhci_set_transfer_mode(struct sdhci_host *host,
>> struct mmc_command *cmd)
>> {
>> @@ -1059,17 +1086,7 @@ 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_enable(host, cmd, &mode);
>> }
>>
>> if (data->flags & MMC_DATA_READ)
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 889e48b..8263ac6 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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