[PATCH 2/2] mmc: core: Add post-power-off-delay-ms support

[Judith Mendez]

Add support for post-power-off-delay-ms which shall be used to insert
a configurable delay post MMC power off.

Signed-off-by: Judith Mendez <jm@xxxxxx>
---
 drivers/mmc/core/core.c  | 8 ++++++--
 drivers/mmc/core/host.c  | 8 ++++++++
 include/linux/mmc/host.h | 1 +
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 29e80e5f928e9..f9049aaf44394 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1394,8 +1394,12 @@ void mmc_power_off(struct mmc_host *host)
 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
 {
 	mmc_power_off(host);
-	/* Wait at least 1 ms according to SD spec */
-	mmc_delay(1);
+	if (host->post_power_off_delay_ms) {
+		mmc_delay(host->post_power_off_delay_ms);
+	} else {
+		/* Wait at least 1 ms according to SD spec */
+		mmc_delay(1);
+	}
 	mmc_power_up(host, ocr);
 }
 
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index b7ce3137d4529..ea8f36827e41c 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -421,6 +421,14 @@ int mmc_of_parse(struct mmc_host *host)
 	device_property_read_u32(dev, "post-power-on-delay-ms",
 				 &host->ios.power_delay_ms);
 
+	device_property_read_u32(dev, "post-power-off-delay-ms",
+				 &host->post_power_off_delay_ms);
+	if (host->post_power_off_delay_ms > 10000) {
+		dev_err(dev, "post-power-off-delay-ms %u exceeds max 10000, setting 10000\n",
+			host->post_power_off_delay_ms);
+		host->post_power_off_delay_ms = 10000;
+	}
+
 	return mmc_pwrseq_alloc(host);
 }
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ba84f02c2a101..b751b61b1116e 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -578,6 +578,7 @@ struct mmc_host {
 
 	u32			err_stats[MMC_ERR_MAX];
 	u32			max_sd_hs_hz;
+	u32			post_power_off_delay_ms;
 	unsigned long		private[] ____cacheline_aligned;
 };
 
-- 
2.54.0