From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaehoon Chung Date: Fri, 17 Nov 2017 18:48:56 +0900 Subject: [U-Boot] mmc1 not working on Samsung snow chromebook In-Reply-To: References: <8f86d9b2-cf81-e089-89f4-d2431f1f6c61@free.fr> <30c84c59-3c8b-4c83-ac4c-4950f0a982d3@free.fr> Message-ID: <9ccabf9e-1f6f-0af7-d582-dbe07af2befd@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: u-boot@lists.denx.de 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. 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 >>>> >>>> >>> >> > > _______________________________________________ > U-Boot mailing list > U-Boot at lists.denx.de > https://lists.denx.de/listinfo/u-boot