From 113b20a054cce6a1cda01471c5d85f29d25c16cc Mon Sep 17 00:00:00 2001
From: Troy Kisky <troy.kisky@boundarydevices.com>
Date: Thu, 24 May 2018 15:58:02 -0700
Subject: [PATCH] mmc: fsl_esdhc: send 80 clocks before 1st command
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
---
drivers/mmc/fsl_esdhc.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 951ab667c19..6bc9ba1dc88 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -142,6 +142,7 @@ struct fsl_esdhc_priv {
struct gpio_desc wp_gpio;
struct gpio_desc reset_gpio;
#endif
+ int sysctrl_inita_needed;
};
/* Return the XFERTYP flags for a given command and data packet */
@@ -416,6 +417,18 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
* resolve timing issues with some cards
*/
udelay(1000);
+ if (priv->sysctrl_inita_needed) {
+ unsigned long start;
+
+ /* send 80 clocks before 1st command */
+ priv->sysctrl_inita_needed = 0;
+ esdhc_setbits32(®s->sysctl, SYSCTL_INITA);
+ start = get_timer(0);
+ while (esdhc_read32(®s->sysctl) & SYSCTL_INITA) {
+ if (get_timer(start) >= 10)
+ break;
+ }
+ }
/* Set up for a data transfer if we have one */
if (data) {
@@ -951,7 +964,7 @@ static int esdhc_init_common(struct fsl_esdhc_priv *priv, struct mmc *mmc)
/* Reset the entire host controller */
esdhc_setbits32(®s->sysctl, SYSCTL_RSTA);
-
+ priv->sysctrl_inita_needed = 1;
/* Wait until the controller is available */
start = get_timer(0);
while ((esdhc_read32(®s->sysctl) & SYSCTL_RSTA)) {
@@ -1097,6 +1110,7 @@ static int fsl_esdhc_init(struct fsl_esdhc_priv *priv,
regs = priv->c.esdhc_regs;
/* First reset the eSDHC controller */
+ priv->sysctrl_inita_needed = 1;
ret = esdhc_reset(regs);
if (ret)
return ret;
--
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