brain-hackers_pepepper-mirror/u-boot-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-09-27 23:20:26 +09:00
Code Issues Projects Releases Wiki Activity

mmc: tmio: sdhi: Implement waiting for DAT0 line state

Browse Source 
When the bus switches to 1.8V mode of operation, it is necessary to
verify that the card correctly initiated and completed the voltage
switch. This is done by reading out the state of DATA0 line.

This patch implement support for reading out the state of the DATA0
line, so the MMC core code can correctly switch to 1.8V mode.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Marek Vasut 2018-10-28 19:28:56 +01:00 committed by Marek Vasut
parent dc1488f1d2
commit 2fc10754d1
1 changed files with 26 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/mmc/renesas-sdhi.c
View File

@ -308,13 +308,38 @@ static int renesas_sdhi_set_ios(struct udevice *dev)
return ret;
}
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
static int renesas_sdhi_wait_dat0(struct udevice *dev, int state, int timeout)
{
int ret = -ETIMEDOUT;
bool dat0_high;
bool target_dat0_high = !!state;
struct tmio_sd_priv *priv = dev_get_priv(dev);
timeout = DIV_ROUND_UP(timeout, 10); /* check every 10 us. */
while (timeout--) {
dat0_high = !!(tmio_sd_readl(priv, TMIO_SD_INFO2) & TMIO_SD_INFO2_DAT0);
if (dat0_high == target_dat0_high) {
ret = 0;
break;
}
udelay(10);
}
return ret;
}
#endif
static const struct dm_mmc_ops renesas_sdhi_ops = {
.send_cmd = tmio_sd_send_cmd,
.set_ios = renesas_sdhi_set_ios,
.get_cd = tmio_sd_get_cd,
#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
.execute_tuning = renesas_sdhi_execute_tuning,
#endif
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
.wait_dat0 = renesas_sdhi_wait_dat0,
#endif
};
#define RENESAS_GEN2_QUIRKS TMIO_SD_CAP_RCAR_GEN2