diff options
| author | Yangbo Lu <yangbo.lu@nxp.com> | 2020-09-01 11:58:07 +0300 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2020-10-12 10:47:06 +0300 |
| commit | 78804de483c4d59d4e23acf8c9fb56eee07fb427 (patch) | |
| tree | 8a4ab02a778c62d6210f793d5cf44b7a09bec343 /drivers/mmc | |
| parent | 30f6444d024a74ee48aa6969c1531aecd3c59deb (diff) | |
| download | u-boot-78804de483c4d59d4e23acf8c9fb56eee07fb427.tar.xz | |
mmc: fsl_esdhc: fix eMMC HS400 stability issue
There was a fix-up for eMMC HS400 stability issue in Linux.
Patch link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
commit/?id=58d0bf843b49fa99588ac9f85178bd8dfd651b53
Description:
Currently only LX2160A eSDHC supports eMMC HS400. According to
a large number of tests, eMMC HS400 failed to work at 150MHz,
and for a few boards failed to work at 175MHz. But eMMC HS400
worked fine on 200MHz. We hadn't found the root cause but
setting eSDHC_DLLCFG0[DLL_FREQ_SEL] = 0 using slow delay chain
seemed to resovle this issue. Let's use this as fixup for now.
Introduce the fix-up in u-boot since the issue could be reproduced
in u-boot too.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/fsl_esdhc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index ce87416f5d..a6092ad26f 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -644,7 +644,10 @@ static void esdhc_set_timing(struct fsl_esdhc_priv *priv, enum bus_mode mode) esdhc_setbits32(®s->sdclkctl, CMD_CLK_CTL); esdhc_clock_control(priv, true); - esdhc_setbits32(®s->dllcfg0, DLL_ENABLE | DLL_FREQ_SEL); + if (priv->clock == 200000000) + esdhc_setbits32(®s->dllcfg0, DLL_FREQ_SEL); + + esdhc_setbits32(®s->dllcfg0, DLL_ENABLE); esdhc_setbits32(®s->tbctl, HS400_WNDW_ADJUST); esdhc_clock_control(priv, false); |