mmc: dw_mmc: rockchip: add support MMC_CAP_RUNTIME_RESUME capability

To support HS200 and UHS mode, mmc core will call init_card() to
execute tuning:
- sdio: init_card can be executed at runtime resume.
- sd and mmc: init_card can be executed at resume or runtime resume,
  which depends on MMC_CAP_RUNTIME_RESUME capability.

On rk3288 SoC, host will get DRTO interrupt when host send command
to read tuning data. This will spend more than 111ms:
drto_ms = drto_clks * 1000 / bus_hz = 111ms.

And the total tuning time will be more than 400ms.

So we should add MMC_CAP_RUNTIME_RESUME capability to execute tuning
at runtime resume. Only if we do so, can we pass resume test.

Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index e2a726a..dbf166f 100644 (file)
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -76,12 +76,20 @@ static int dw_mci_rockchip_init(struct dw_mci *host)
        return 0;
 }
 
+/* Common capabilities of RK3288 SoC */
+static unsigned long dw_mci_rk3288_dwmmc_caps[4] = {
+       MMC_CAP_RUNTIME_RESUME, /* emmc */
+       MMC_CAP_RUNTIME_RESUME, /* sdmmc */
+       MMC_CAP_RUNTIME_RESUME, /* sdio0 */
+       MMC_CAP_RUNTIME_RESUME, /* sdio1 */
+};
 static const struct dw_mci_drv_data rk2928_drv_data = {
        .prepare_command        = dw_mci_rockchip_prepare_command,
        .init                   = dw_mci_rockchip_init,
 };
 
 static const struct dw_mci_drv_data rk3288_drv_data = {
+       .caps                   = dw_mci_rk3288_dwmmc_caps,
        .prepare_command        = dw_mci_rockchip_prepare_command,
        .set_ios                = dw_mci_rk3288_set_ios,
        .setup_clock    = dw_mci_rk3288_setup_clock,