Messages in this thread Patch in this message | | | From | Chunyan Zhang <> | Subject | [PATCH V3 1/7] mmc: sdhci: add sd host v4 mode | Date | Mon, 9 Jul 2018 11:19:52 +0800 |
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For SD host controller version 4.00 or later ones, there're two modes of implementation - Version 3.00 compatible mode or Version 4 mode. This patch introduced an interface to enable v4 mode.
Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> --- drivers/mmc/host/sdhci.c | 11 +++++++++++ drivers/mmc/host/sdhci.h | 5 +++++ 2 files changed, 16 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1c828e0..525862f 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3321,6 +3321,17 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev, EXPORT_SYMBOL_GPL(sdhci_alloc_host); +/* + * Vendor's Host Controller which supports v4 mode can call + * this function to enable v4 mode before calling + * __sdhci_add_host(). + */ +void sdhci_enable_v4_mode(struct sdhci_host *host) +{ + host->v4_mode = true; +} +EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode); + static int sdhci_set_dma_mask(struct sdhci_host *host) { struct mmc_host *mmc = host->mmc; diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 23966f8..e98249b 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -184,6 +184,7 @@ #define SDHCI_CTRL_DRV_TYPE_D 0x0030 #define SDHCI_CTRL_EXEC_TUNING 0x0040 #define SDHCI_CTRL_TUNED_CLK 0x0080 +#define SDHCI_CTRL_V4_MODE 0x1000 #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 #define SDHCI_CAPABILITIES 0x40 @@ -566,6 +567,9 @@ struct sdhci_host { u64 data_timeout; unsigned long private[0] ____cacheline_aligned; + + /* Host Version 4 Enable */ + bool v4_mode; }; struct sdhci_ops { @@ -747,5 +751,6 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error, int *data_error); void sdhci_dumpregs(struct sdhci_host *host); +void sdhci_enable_v4_mode(struct sdhci_host *host); #endif /* __SDHCI_HW_H */ -- 2.7.4
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