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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>
This commit is contained in:
Haibo Chen 2020-09-22 18:11:43 +08:00 committed by Peng Fan
parent ef5ab0d13a
commit 9098682200
1 changed files with 0 additions and 7 deletions
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7
drivers/mmc/fsl_esdhc_imx.c
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@ -462,13 +462,6 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
while (esdhc_read32(&regs->prsstat) & PRSSTAT_DLA) 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 */ /* Set up for a data transfer if we have one */
if (data) { if (data) {
err = esdhc_setup_data(priv, mmc, data); err = esdhc_setup_data(priv, mmc, data);