From 941a659ffdefe31af8222451ca2a74ebab8d98dd Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Thu, 14 Jul 2016 15:22:27 +0200 Subject: [PATCH] mmc: dw_mmc: exynos: Warn if HS400 is being used on non-Exynos5420 chipset Chipsets before Exynos5420 did not support HS400 so if MMC core tries to configure HS400 timing, this might or might not work. Warn in such cases because this is DTB misconfiguration. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Alim Akhtar Signed-off-by: Jaehoon Chung Signed-off-by: Ulf Hansson --- drivers/mmc/host/dw_mmc-exynos.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index da0ef1765735..7ab3d749b5ae 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -225,8 +225,12 @@ static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing) * Not supported to configure register * related to HS400 */ - if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) + if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) { + if (timing == MMC_TIMING_MMC_HS400) + dev_warn(host->dev, + "cannot configure HS400, unsupported chipset\n"); return; + } dqs = priv->saved_dqs_en; strobe = priv->saved_strobe_ctrl; -- 2.20.1