Le 17/11/2017 à 10:36, Lukasz Majewski a écrit :
On Thu, 16 Nov 2017 13:29:56 +0100
Guillaume Gardet <guillaume.gar...@free.fr> wrote:
I found a workaround. If I disable MMC_MODE_HS_52MHz, then it is
working fine.
I guess there is a better way to implement the following patch ?
**********************************************************************
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 23f642980b..a6a0934eef 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;
+ /* MMC_MODE_HS_52MHz is broken (at least) on Samsung Snow, so
disbale it for now */
+ cfg->host_caps |= MMC_MODE_HS;
This seems like a workaround. The root cause of the problem is the
regression with HS 52MHz....
Not sure it ever worked on this target.
Guillaume
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
}
**********************************************************************
Guillaume
Le 15/11/2017 à 11:27, Guillaume Gardet a écrit :
Le 15/11/2017 à 11:22, Guillaume Gardet a écrit :
Forgot to Cc ML. Done now.
Le 15/11/2017 à 11:14, Guillaume Gardet a écrit :
Hello,
I tested U-Boot v2017.09 on a Samsung Snow (Chromebook ARM) and
while mmc0 (internal eMMC) is working fine, mmc1 (external SD
slot) does not work. I get the following error for 'mmc dev 1'
command: mmc_init: -110, time 30
Please also note that on boot (or on 1st 'mmc dev 1' cmd if I stop
auto-boot), I firstly get: mmc_init: -5, time 39
Then, all next attempts retruns:
mmc_init: -110, time 30
Guillaume
Any idea what could be wrong?
Guillaume
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Lukasz Majewski
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