On 07/15/2016 01:15 PM, Alim Akhtar wrote:

Hi Krzysztof,

On 07/14/2016 06:52 PM, Krzysztof Kozlowski wrote:

quoted

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 <redacted>
---

Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>

Applied on my repository. Thanks!
Before applied, I modified the prefix of subject from "dwmmc" to "dw_mmc"

Best Regards,
Jaehoon Chung

quoted

  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;
+    }

It is good to have extra bit of debug information handy.

quoted

      dqs = priv->saved_dqs_en;
      strobe = priv->saved_strobe_ctrl;