mmc: rtsx_pci_sdmmc: Don't execute power up sequence repeatedly
For some Realtek card readers, the power up sequence can only be executed
when power has been turned off fully.
So the rtsx host should not start power up sequence again when set_ios
been called if the power has been turned on.
Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index f981f7d..ad13f42 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -57,6 +57,9 @@
bool eject;
bool initial_mode;
bool ddr_mode;
+ int power_state;
+#define SDMMC_POWER_ON 1
+#define SDMMC_POWER_OFF 0
};
static inline struct device *sdmmc_dev(struct realtek_pci_sdmmc *host)
@@ -765,6 +768,9 @@
struct rtsx_pcr *pcr = host->pcr;
int err;
+ if (host->power_state == SDMMC_POWER_ON)
+ return 0;
+
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
@@ -787,6 +793,7 @@
if (err < 0)
return err;
+ host->power_state = SDMMC_POWER_ON;
return 0;
}
@@ -795,6 +802,8 @@
struct rtsx_pcr *pcr = host->pcr;
int err;
+ host->power_state = SDMMC_POWER_OFF;
+
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
@@ -1260,6 +1269,7 @@
host->pcr = pcr;
host->mmc = mmc;
host->pdev = pdev;
+ host->power_state = SDMMC_POWER_OFF;
platform_set_drvdata(pdev, host);
pcr->slots[RTSX_SD_CARD].p_dev = pdev;
pcr->slots[RTSX_SD_CARD].card_event = rtsx_pci_sdmmc_card_event;