commit c2700de02b770bb3cd3f5041b2fd91ae7d0f2722
author Haibo Chen <haibo.chen@nxp.com> Tue Sep 22 18:11:43 2020 +0800
committer Peng Fan <peng.fan@nxp.com> Mon Oct 12 15:48:13 2020 +0800
tree 5f33047cedc3da21ec74d0a78cbfbbdb770e066a
parent d8de5e4fb6b0f2b7be0593d56a0ba0e9db9690eb

mmc: fsl_esdhc_imx: remove the 1ms delay before sending command

This 1ms delay before sending command already exist from the beginning
of the fsl_esdhc driver added in year 2008. Now this driver has been
split for two files: fsl_esdhc.c and fsl_esdhc_imx.c. fsl_esdhc_imx.c
only for i.MX series. i.MX series esdhc/usdhc do not need this 1ms delay
before sending any command. So remove this 1ms, this will save a lot
time if handling a large mmc data.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>

drivers/mmc/fsl_esdhc_imx.c

diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c
index 0c866b1..caaef0b 100644
--- a/drivers/mmc/fsl_esdhc_imx.c
+++ b/drivers/mmc/fsl_esdhc_imx.c
@@ -462,13 +462,6 @@
 	while (esdhc_read32(&regs->prsstat) & PRSSTAT_DLA)
 		;
 
-	/* Wait at least 8 SD clock cycles before the next command */
-	/*
-	 * Note: This is way more than 8 cycles, but 1ms seems to
-	 * resolve timing issues with some cards
-	 */
-	udelay(1000);
-
 	/* Set up for a data transfer if we have one */
 	if (data) {
 		err = esdhc_setup_data(priv, mmc, data);