mmc: rtsx: Let MMC core handle runtime PM

BugLink: https://bugs.launchpad.net/bugs/1963615

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>
(cherry picked from commit 7570fb4 linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>

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;