On Wed, Nov 13, 2013 at 5:49 AM, David Cohen <david.a.cohen@xxxxxxxxxxxxxxx> wrote: > On 10/29/2013 10:58 AM, David Cohen wrote: >> >> Hi, >> >> SDHCI used to work well on Intel Merrifield until this patch was applied: >> >> commit 156e14b126ffb6f040bc6f1aff3c51077e42a744 >> Author: Giuseppe CAVALLARO <peppe.cavallaro@xxxxxx> >> Date: Wed Jun 12 08:16:38 2013 +0200 >> >> mmc: sdhci: fix caps2 for HS200 >> >> Although the HC supports HS200 (eMMC) the caps2 are always zero; this >> means there's no way to use the super speed mode (when init the >> card). >> >> If the HC support SDR104, for SD3.0, so it also supports HS200 for >> eMMC >> and this patch just sets the MMC_CAP2_HS200 in the host caps2 field. >> >> Looks like there is a hw issue with unknown root cause so far. >> >> Is it acceptable to have the quirk I'm proposing to workaround the issue? > > > Ping. Any comments here? > Chris, Can you pick this one? IMX also needs this quirk for imx6q/dl since it can not meet HS200 timing requirement. David, Is the unkonwn hw issue in your patch #2 resolved now? If yes, you may not need this quirk. I could resend it with your sign-off with IMX patches. Regards Dong Aisheng > Br, David Cohen > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
