mmc: dw_mmc: exynos: Warn if HS400 is being used on non-Exynos5420 ch…

…ipset 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 <[email protected]> Reviewed-by: Alim Akhtar <[email protected]> Signed-off-by: Jaehoon Chung <[email protected]> Signed-off-by: Ulf Hansson <[email protected]>
chewitt · Sep 26, 2016 · 941a659 · 941a659
1 parent 0ed50ab
commit 941a659
Showing 1 changed file with 5 additions and 1 deletion.
diff --git 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;