On Fri, Nov 26, 2021 at 08:38:20AM +0900, Jaehoon Chung wrote:

On 11/25/21 3:46 AM, John Keeping wrote:

quoted

Move the common MMC_CAP_CMD23 capability to common_caps so that only the
special case of MMC_CAP_1_8V_DDR and MMC_CAP_8_BIT_DATA are set via
caps/num_caps.  Both of those can, and should, be set via device tree
properties instead, so we can now say that exynos_dwmmc_caps is only
used for backwards compatibility.

Signed-off-by: John Keeping <redacted>

Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

Added minor comment..

quoted

---
 drivers/mmc/host/dw_mmc-exynos.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index c2dd29ef45c6..f76eeeb0cc53 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c

@@ -526,15 +526,16 @@ static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host,
 
 /* Common capabilities of Exynos4/Exynos5 SoC */
 static unsigned long exynos_dwmmc_caps[4] = {
-	MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
-	MMC_CAP_CMD23,
-	MMC_CAP_CMD23,
-	MMC_CAP_CMD23,
+	MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA,
+	0,
+	0,
+	0,
 };

It can be removed all things.

Do you mean that the MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA entries are
not needed at all?

I know those can be set via DT but I don't think any Exynos DTs are
currently using mmc-ddr-1_8v, so removing MMC_CAP_1_8V_DDR looks like a
change in behaviour.

MMC_CAP_8_BIT_DATA looks easier to remove, although
exynos4412-p4note.dtsi seems to set the incorrect bus-width for mshc_0
so there would be a change of behaviour on that platform from removing
this.

Maybe it makes sense to add a warning in dw_mci_init_slot_caps() if any
new caps are set by drv_data->caps[ctrl_id], to make it clear that this
is deprecated.


Regards,
John

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