Le 26/04/2018 à 12:31, Jaehoon Chung a écrit :
Hi,
On 04/09/2018 09:02 PM, Guillaume Gardet wrote:
Hi Jaehoon,
There are problems with SD card access on Samsung Chromebook (snow) with latest
master (and also 2018.05-rc1 and 2018.03).
eMMC is ok, but SD card access leads to 'unable to select a mode' problem. If I
disable HS mode, I can access the SD card without problem:
********************************************************************************
********************************************************************************
Once we try to select HS mode, all access to SD card result in failure, even
when trying to setup a lower frequency mode, including SD legacy at 25 MHz.
Any idea what is going? Maybe you have fixes pending?
Sorry for late. Hmm. I will check your issue. Just disable MMC_MODE_HS, then
it's working fine?
or HS_52MHz?
I tried to disable HS_52MHz only and it did not fix the problem. Then I tried
to disable both HS and HS_52MHz and it fixed the problem.
Guillaume
Best Regards,
Jaehoon Chung
Guillaume
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 23f642980bf..28f4fa0f213 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -508,7 +508,8 @@ void dwmci_setup_cfg(struct mmc_config *cfg, struct
dwmci_host *host,
cfg->host_caps |= MMC_MODE_4BIT;
cfg->host_caps &= ~MMC_MODE_8BIT;
}
- cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
+ /* Temp workaround for Chromebook snow to avoid the 'unable to select a
mode' error */
+// cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
}
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