Commit f21adcb8 authored by Liming Sun's avatar Liming Sun Committed by Ulf Hansson
Browse files

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



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

Reviewed-by: default avatarDavid Thompson <davthompson@nvidia.com>
Signed-off-by: default avatarLiming Sun <limings@nvidia.com>
Link: https://lore.kernel.org/r/3df02ffa8bdaa74f5261c8914d2545b97fb3478a.1718213918.git.limings@nvidia.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 1535085f

drivers/mmc/host/dw_mmc.c

+6 −0
Original line number Diff line number Diff line
@@ -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

drivers/mmc/host/dw_mmc.h

+2 −0
Original line number Diff line number Diff line
@@ -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_ */