commit 1822a972d348a8b1cb6551a73a96086b48f9f8e6
author Stephen Carlson <stcarlso@linux.microsoft.com> Tue Aug 17 12:46:40 2021 -0700
committer Jaehoon Chung <jh80.chung@samsung.com> Fri Oct 29 18:22:32 2021 +0900
tree ac34b0d301459eab1fed92bd2255fbea973d0881
parent 45f01d91560884c7f7391608ffe3044e4e378c1a

drivers: mmc: Add wait_dat0 support for Freescale eSDHC driver

Adds an implementation of the wait_dat0 MMC operation for the Freescale
eSHDC driver, allowing the driver to continue when the card is ready
rather than waiting for the worst case time on each MMC switch operation.

Signed-off-by: Stephen Carlson <stcarlso@linux.microsoft.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/fsl_esdhc.c

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index ebb307e..05a6d0c 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -27,6 +27,7 @@
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
+#include <linux/iopoll.h>
 #include <linux/dma-mapping.h>
 #include <sdhci.h>
 
@@ -1138,6 +1139,20 @@
 	return 0;
 }
 
+static int fsl_esdhc_wait_dat0(struct udevice *dev, int state,
+			       int timeout_us)
+{
+	int ret;
+	u32 tmp;
+	struct fsl_esdhc_priv *priv = dev_get_priv(dev);
+	struct fsl_esdhc *regs = priv->esdhc_regs;
+
+	ret = readx_poll_timeout(esdhc_read32, &regs->prsstat, tmp,
+				 !!(tmp & PRSSTAT_DAT0) == !!state,
+				 timeout_us);
+	return ret;
+}
+
 static const struct dm_mmc_ops fsl_esdhc_ops = {
 	.get_cd		= fsl_esdhc_get_cd,
 	.send_cmd	= fsl_esdhc_send_cmd,
@@ -1147,6 +1162,7 @@
 #endif
 	.reinit = fsl_esdhc_reinit,
 	.hs400_prepare_ddr = fsl_esdhc_hs400_prepare_ddr,
+	.wait_dat0 = fsl_esdhc_wait_dat0,
 };
 
 static const struct udevice_id fsl_esdhc_ids[] = {