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mmc: dw_mmc: Add support for platform specific eMMC HW reset

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This commit adds a new callback to allow drivers to support platform
specific eMMC HW reset.

Reviewed-by: David Thompson <davthompson@nvidia.com>
Signed-off-by: Liming Sun <limings@nvidia.com>
Link: https://lore.kernel.org/r/3df02ffa8bdaa74f5261c8914d2545b97fb3478a.1718213918.git.limings@nvidia.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Liming Sun 2024-06-12 18:52:37 -04:00 committed by Ulf Hansson
parent 1535085f99
commit f21adcb866
2 changed files with 8 additions and 0 deletions
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6
drivers/mmc/host/dw_mmc.c
View File

@ -1617,6 +1617,7 @@ static void dw_mci_hw_reset(struct mmc_host *mmc)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci *host = slot->host;
const struct dw_mci_drv_data *drv_data = host->drv_data;
int reset;
if (host->use_dma == TRANS_MODE_IDMAC)
@ -1626,6 +1627,11 @@ static void dw_mci_hw_reset(struct mmc_host *mmc)
SDMMC_CTRL_FIFO_RESET))
return;
if (drv_data && drv_data->hw_reset) {
drv_data->hw_reset(host);
return;
}
/*
* According to eMMC spec, card reset procedure:
* tRstW >= 1us: RST_n pulse width

2
drivers/mmc/host/dw_mmc.h
View File

@ -566,6 +566,7 @@ struct dw_mci_slot {
* @execute_tuning: implementation specific tuning procedure.
* @set_data_timeout: implementation specific timeout.
* @get_drto_clks: implementation specific cycle count for data read timeout.
* @hw_reset: implementation specific HW reset.
*
* Provide controller implementation specific extensions. The usage of this
* data structure is fully optional and usage of each member in this structure
@ -586,5 +587,6 @@ struct dw_mci_drv_data {
void (*set_data_timeout)(struct dw_mci *host,
unsigned int timeout_ns);
u32 (*get_drto_clks)(struct dw_mci *host);
void (*hw_reset)(struct dw_mci *host);
};
#endif /* _DW_MMC_H_ */