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mmc: matsushita-common: Wait for command completion

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Make sure to wait for the command to complete altogether, including
the trailing 8 clock cycles. This prevents the driver for accidentally
writing the CMD register too fast before the previous command fully
completed.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Marek Vasut 2018-04-09 20:47:31 +02:00
parent 8dc9a10e49
commit f23b208ebe
2 changed files with 3 additions and 0 deletions
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2
drivers/mmc/matsushita-common.c
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@ -498,6 +498,8 @@ int matsu_sd_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
return ret;
}
matsu_sd_wait_for_irq(dev, MATSU_SD_INFO2, MATSU_SD_INFO2_SCLKDIVEN);
return ret;
}

1
drivers/mmc/matsushita-common.h
View File

@ -38,6 +38,7 @@
#define MATSU_SD_INFO2 0x03c /* IRQ status 2 */
#define MATSU_SD_INFO2_ERR_ILA BIT(15) /* illegal access err */
#define MATSU_SD_INFO2_CBSY BIT(14) /* command busy */
#define MATSU_SD_INFO2_SCLKDIVEN BIT(13) /* command setting reg ena */
#define MATSU_SD_INFO2_BWE BIT(9) /* write buffer ready */
#define MATSU_SD_INFO2_BRE BIT(8) /* read buffer ready */
#define MATSU_SD_INFO2_DAT0 BIT(7) /* SDDAT0 */