diff mbox series

[v1,1/2,SRU,J:linux-bluefield] mmc: dw_mmc: Add support for platform specific eMMC HW reset

Message ID 08b0cb030e8692b3550b72e0c9bd9273f8832a5c.1720642165.git.limings@nvidia.com
State New
Headers show
Series mmc: dw_mmc-bluefield: | expand

Commit Message

Liming Sun July 10, 2024, 8:26 p.m. UTC 
BugLink: https://bugs.launchpad.net/bugs/2072675

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>
(cherry picked from commit f21adcb86653e2b2784bbc0f180c332b50c404df)
---
 drivers/mmc/host/dw_mmc.c | 6 ++++++
 drivers/mmc/host/dw_mmc.h | 2 ++
 2 files changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 1e8f1bb3cad7..bbfe93b0f844 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1587,6 +1587,7 @@  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)
@@ -1596,6 +1597,11 @@  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
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index ce05d81477d9..2e4bd94e3712 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -554,6 +554,7 @@  struct dw_mci_slot {
  * @set_ios: handle bus specific extensions.
  * @parse_dt: parse implementation specific device tree properties.
  * @execute_tuning: implementation specific tuning procedure.
+ * @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
@@ -570,5 +571,6 @@  struct dw_mci_drv_data {
 						struct mmc_ios *ios);
 	int		(*switch_voltage)(struct mmc_host *mmc,
 					  struct mmc_ios *ios);
+	void		(*hw_reset)(struct dw_mci *host);
 };
 #endif /* _DW_MMC_H_ */