From ef4d0888bb7e1b963880f086575081c3d39cad2d Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 15 Jan 2013 23:30:27 +0800 Subject: [PATCH] mmc: sdhci-esdhc-imx: fix host version read When commit 95a2482 (mmc: sdhci-esdhc-imx: add basic imx6q usdhc support) works around host version issue on imx6q, it gets the register address fixup "reg ^= 2" lost for imx25/35/51/53 esdhc. Thus, the controller version on these SoCs is wrongly identified as v1 while it's actually v2. Add the address fixup back and take a different approach to correct imx6q host version, so that the host version read gets back to work for all SoCs. Signed-off-by: Shawn Guo Cc: Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci-esdhc-imx.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index ae68bc965ab5..ac6f971b625f 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -220,15 +220,18 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg) static u16 esdhc_readw_le(struct sdhci_host *host, int reg) { + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_imx_data *imx_data = pltfm_host->priv; + if (unlikely(reg == SDHCI_HOST_VERSION)) { - u16 val = readw(host->ioaddr + (reg ^ 2)); - /* - * uSDHC supports SDHCI v3.0, but it's encoded as value - * 0x3 in host controller version register, which violates - * SDHCI_SPEC_300 definition. Work it around here. - */ - if ((val & SDHCI_SPEC_VER_MASK) == 3) - return --val; + reg ^= 2; + if (is_imx6q_usdhc(imx_data)) { + /* + * The usdhc register returns a wrong host version. + * Correct it here. + */ + return SDHCI_SPEC_300; + } } return readw(host->ioaddr + reg); -- GitLab