redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

mmc: core: retry CMD1 in mmc_send_op_cond() even if the ocr = 0 

According to eMMC specification v5.1 section 6.4.3, we should issue
CMD1 repeatedly in the idle state until the eMMC is ready even if
the mmc_attach_mmc() calls this function with ocr = 0. Otherwise
some eMMC devices seems to enter the inactive mode after
mmc_init_card() issued CMD0 when the eMMC device is busy.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
hifive-unleashed-5.2
Yoshihiro Shimoda 2019-04-09 20:05:06 +09:00 committed by Ulf Hansson
parent 71c733c4e1
commit 4c94cb651f
1 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/mmc/core/mmc_ops.c
View File

@ -184,11 +184,7 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
if (err)
break;
/* if we're just probing, do a single pass */
if (ocr == 0)
break;
/* otherwise wait until reset completes */
/* wait until reset completes */
if (mmc_host_is_spi(host)) {
if (!(cmd.resp[0] & R1_SPI_IDLE))
break;
@ -200,6 +196,16 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
err = -ETIMEDOUT;
mmc_delay(10);
/*
* According to eMMC specification v5.1 section 6.4.3, we
* should issue CMD1 repeatedly in the idle state until
* the eMMC is ready. Otherwise some eMMC devices seem to enter
* the inactive mode after mmc_init_card() issued CMD0 when
* the eMMC device is busy.
*/
if (!ocr && !mmc_host_is_spi(host))
cmd.arg = cmd.resp[0] | BIT(30);
}
if (rocr && !mmc_host_is_spi(host))