From: Yangbo Lu <yangbo.lu@freescale.com>
To: scottwood@freescale.com, linux-mmc@vger.kernel.org,
ulf.hansson@linaro.org
Cc: Yangbo Lu <yangbo.lu@freescale.com>
Subject: [v2, 3/3] mmc: sdhci-of-esdhc: add workaround for T4240 incorrect HOSTVER value
Date: Thu, 27 Aug 2015 17:29:14 +0800 [thread overview]
Message-ID: <1440667754-25466-1-git-send-email-yangbo.lu@freescale.com> (raw)
For T4240-R1.0-R2.0, the HOSTVER register has incorrcet vender
version value and sdhc spec version value. This will break down
the ADMA data transfer. So add workaround to get right value
VVN=0x13, SVN = 0x1.
Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
---
drivers/mmc/host/sdhci-of-esdhc.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 20e0b9a..84496f0 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -70,6 +70,14 @@ static u16 esdhc_readw(struct sdhci_host *host, int reg)
ret = in_be32(host->ioaddr + base) & 0xffff;
else
ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
+
+ /* Workaround for T4240-R1.0-R2.0 eSDHC which has incorrect
+ * vendor version and spec version information.
+ */
+ if ((reg == SDHCI_HOST_VERSION) &&
+ (soc_ver == SVR_T4240) && (soc_rev <= 0x20))
+ ret = (VENDOR_V_23 << SDHCI_VENDOR_VER_SHIFT) | SDHCI_SPEC_200;
+
return ret;
}
--
2.1.0.27.g96db324
reply other threads:[~2015-08-27 9:49 UTC|newest]
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