mmc: rtsx: Let MMC core handle runtime PM

Since MMC core handles runtime PM reference counting, we can avoid doing
redundant runtime PM work in the driver. That means the only thing
commit 5b4258f ("misc: rtsx: rts5249 support runtime PM") misses is
to always enable runtime PM, to let its parent driver enable ASPM in the
runtime idle routine.

Fixes: 7499b52 ("mmc: rtsx: Use pm_runtime_{get,put}() to handle runtime PM")
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20220216055435.2335297-1-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mmc/host/rtsx_pci_sdmmc.c

@@ -823,7 +823,6 @@ static void sd_request(struct work_struct *work)
 	}
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -860,8 +859,6 @@ static void sd_request(struct work_struct *work)
 			data->bytes_xfered = data->blocks * data->blksz;
 	}
 
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 
 finish:
@@ -1093,7 +1090,6 @@ static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		return;
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -1127,8 +1123,6 @@ static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	rtsx_pci_switch_clock(pcr, ios->clock, host->ssc_depth,
 			host->initial_mode, host->double_clk, host->vpclk);
 
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 }
 
@@ -1144,7 +1138,6 @@ static int sdmmc_get_ro(struct mmc_host *mmc)
 		return -ENOMEDIUM;
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -1154,8 +1147,6 @@ static int sdmmc_get_ro(struct mmc_host *mmc)
 	if (val & SD_WRITE_PROTECT)
 		ro = 1;
 
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 
 	return ro;
@@ -1173,7 +1164,6 @@ static int sdmmc_get_cd(struct mmc_host *mmc)
 		return cd;
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -1183,8 +1173,6 @@ static int sdmmc_get_cd(struct mmc_host *mmc)
 	if (val & SD_EXIST)
 		cd = 1;
 
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 
 	return cd;
@@ -1282,7 +1270,6 @@ static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 		return err;
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -1312,8 +1299,6 @@ static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 	err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
 			SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
 
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 
 	return err;
@@ -1334,7 +1319,6 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 		return err;
 
 	mutex_lock(&pcr->pcr_mutex);
-	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -1367,8 +1351,6 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 		err = sd_change_phase(host, DDR50_RX_PHASE(pcr), true);
 
 out:
-	pm_runtime_mark_last_busy(dev);
-	pm_runtime_put_autosuspend(dev);
 	mutex_unlock(&pcr->pcr_mutex);
 
 	return err;