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mmc: sdhci-pxav3: disable clock inversion for HS MMC cards

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According to 'FE-2946959' erratum the clock inversion option is
needed to support slow frequencies when the card input hold time
requirement is high. This setting is not required for high speed
MMC and might cause timing violation.

Signed-off-by: Nadav Haklai <nadavh@marvell.com>
Cc: <stable@vger.kernel.org> # v4.2
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Nadav Haklai 2015-10-06 03:22:36 +02:00 • committed by Ulf Hansson
parent 5de76bfcb1
commit fa7964147d
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/sdhci-pxav3.c
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@ -291,6 +291,9 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
uhs == MMC_TIMING_UHS_DDR50) { uhs == MMC_TIMING_UHS_DDR50) {
reg_val &= ~SDIO3_CONF_CLK_INV; reg_val &= ~SDIO3_CONF_CLK_INV;
reg_val |= SDIO3_CONF_SD_FB_CLK; reg_val |= SDIO3_CONF_SD_FB_CLK;
} else if (uhs == MMC_TIMING_MMC_HS) {
reg_val &= ~SDIO3_CONF_CLK_INV;
reg_val &= ~SDIO3_CONF_SD_FB_CLK;
} else { } else {
reg_val |= SDIO3_CONF_CLK_INV; reg_val |= SDIO3_CONF_CLK_INV;
reg_val &= ~SDIO3_CONF_SD_FB_CLK; reg_val &= ~SDIO3_CONF_SD_FB_CLK;