Hi,
Le 17/01/2018 à 11:05, Jaehoon Chung a écrit :
Hi Guillaume,
On 01/09/2018 11:37 PM, Guillaume Gardet wrote:
Hi,
Le 17/11/2017 à 10:48, Jaehoon Chung a écrit :
Hi,
On 2017년 11월 16일 21:29, Guillaume Gardet 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;
It means that card is running the lower clock frequency..it's not solution.
Timing issue and some problems should be fixed with lowest frequency.
Now, i can't test and check more detail. After back to my office or home, i
will check what main cause.
Any progress on this topic ?
Sorry for late. It seems that is related with mmc_power_cycle().
commit 2e7410d76ad11856d09284c18d262d0bb2a3da0c
Author: Kishon Vijay Abraham I <kis...@ti.com>
Date: Thu Sep 21 16:30:04 2017 +0200
mmc: disable the mmc clock during power off
There is no point in having the mmc clock enabled during
power off. Disable the mmc clock. This is similar to how it's
programmed in Linux Kernel.
Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
Signed-off-by: Vignesh R <vigne...@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com>
Reviewed-by: Simon Glass <s...@chromium.org>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 664b71affd..be68d8d930 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1971,6 +1971,7 @@ static int mmc_power_on(struct mmc *mmc)
static int mmc_power_off(struct mmc *mmc)
{
+ mmc_set_clock(mmc, 1, true);
#if CONFIG_IS_ENABLED(DM_MMC) && CONFIG_IS_ENABLED(DM_REGULATOR)
if (mmc->vmmc_supply) {
int ret = regulator_set_enable(mmc->vmmc_supply, false);
Current, I'm looking for fixing it.
Could you test with removing its code?
As replied to your patch which fixes this commit, it fixed the MMC problem on
snow.
Thanks a lot!
Guillaume
Best Regards,
Jaehoon Chung
Guillaume
Best Regards,
Jaehoon Chung
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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