From: Haibo Chen <haibo.chen@nxp.com>
To: adrian.hunter@intel.com, ulf.hansson@linaro.org, aisheng.dong@nxp.com
Cc: tharvey@gateworks.com, stable@vger.kernel.org, linux-mmc@vger.kernel.org
Subject: [PATCH] mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card
Date: Mon, 17 Apr 2017 19:10:02 +0800 [thread overview]
Message-ID: <1492427402-5506-1-git-send-email-haibo.chen@nxp.com> (raw)
Currently for DDR50 card, it need tuning in default. We meet tuning fail
issue for DDR50 card and some data CRC error when DDR50 sd card works.
This is because the default pad I/O drive strength can't make sure DDR50
card work stable. So increase the pad I/O drive strength for DDR50 card,
and use pins_100mhz.
Tested-and-reported-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Cc: stable@vger.kernel.org # v4.4+
---
drivers/mmc/host/sdhci-esdhc-imx.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index cf666a0..abad67a 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -830,6 +830,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
switch (uhs) {
case MMC_TIMING_UHS_SDR50:
+ case MMC_TIMING_UHS_DDR50:
pinctrl = imx_data->pins_100mhz;
break;
case MMC_TIMING_UHS_SDR104:
--
1.9.1
next reply other threads:[~2017-04-17 11:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-17 11:10 Haibo Chen [this message]
2017-04-18 7:01 ` [PATCH] mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card Adrian Hunter
2017-04-18 10:23 ` Dong Aisheng
2017-04-18 14:33 ` Tim Harvey
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