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@xxxxxxxxxxxx>
Signed-off-by: Addy Ke <addy.ke@xxxxxxxxxxxxxx>
---
Changes in v2:
- add this capability for all 4 slots, suggested by Doug Anderson.
drivers/mmc/host/dw_mmc-rockchip.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index e2a726a..dbf166f 100644
--- 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,
--
1.8.3.2
--
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