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From:   Kai-Heng Feng <kai.heng.feng@canonical.com>
To:     arnd@arndb.de, gregkh@linuxfoundation.org, ulf.hansson@linaro.org
Cc:     linux-pm@vger.kernel.org,
        Kai-Heng Feng <kai.heng.feng@canonical.com>,
        Ricky WU <ricky_wu@realtek.com>,
        Thomas Hebb <tommyhebb@gmail.com>, linux-mmc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v6 1/4] mmc: rtsx: Use pm_runtime_{get,put}() to handle runtime PM
Date:   Tue, 25 Jan 2022 13:50:06 +0800
Message-Id: <20220125055010.1866563-1-kai.heng.feng@canonical.com>
In-Reply-To: <20220121014039.1693208-1-kai.heng.feng@canonical.com>
References: <20220121014039.1693208-1-kai.heng.feng@canonical.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Commit 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM") doesn't
use pm_runtime_{get,put}() helpers when it should, so the RPM refcount
keeps at zero, hence its parent driver, rtsx_pci, has to do lots of
weird tricks to keep it from runtime suspending.

So use those helpers at right places to properly manage runtime PM.

Fixes: 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM")
Cc: Ricky WU <ricky_wu@realtek.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v6:
 - Change the auto suspend delay to 200ms as Realtek suggested.

v5:
 - Revert back to v3 as Realtek suggested.

v4:
 - Decrease the autosuspend delay to 200ms for more power saving.

v3:
v2:
 - No change.

 drivers/mmc/host/rtsx_pci_sdmmc.c | 44 +++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index 58cfaffa3c2d8..2a3f14afe9f83 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -806,6 +806,7 @@ static void sd_request(struct work_struct *work)
 	struct mmc_request *mrq = host->mrq;
 	struct mmc_command *cmd = mrq->cmd;
 	struct mmc_data *data = mrq->data;
+	struct device *dev = &host->pdev->dev;
 
 	unsigned int data_size = 0;
 	int err;
@@ -822,6 +823,7 @@ static void sd_request(struct work_struct *work)
 	}
 
 	mutex_lock(&pcr->pcr_mutex);
+	pm_runtime_get_sync(dev);
 
 	rtsx_pci_start_run(pcr);
 
@@ -858,6 +860,8 @@ 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:
@@ -1080,6 +1084,7 @@ static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 {
 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
 	struct rtsx_pcr *pcr = host->pcr;
+	struct device *dev = &host->pdev->dev;
 
 	if (host->eject)
 		return;
@@ -1088,6 +1093,7 @@ 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);
 
@@ -1121,6 +1127,8 @@ 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);
 }
 
@@ -1128,6 +1136,7 @@ static int sdmmc_get_ro(struct mmc_host *mmc)
 {
 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
 	struct rtsx_pcr *pcr = host->pcr;
+	struct device *dev = &host->pdev->dev;
 	int ro = 0;
 	u32 val;
 
@@ -1135,6 +1144,7 @@ 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);
 
@@ -1144,6 +1154,8 @@ 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;
@@ -1153,6 +1165,7 @@ static int sdmmc_get_cd(struct mmc_host *mmc)
 {
 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
 	struct rtsx_pcr *pcr = host->pcr;
+	struct device *dev = &host->pdev->dev;
 	int cd = 0;
 	u32 val;
 
@@ -1160,6 +1173,7 @@ 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);
 
@@ -1169,6 +1183,8 @@ 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;
@@ -1251,6 +1267,7 @@ static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 {
 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
 	struct rtsx_pcr *pcr = host->pcr;
+	struct device *dev = &host->pdev->dev;
 	int err = 0;
 	u8 voltage;
 
@@ -1265,6 +1282,7 @@ 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);
 
@@ -1294,6 +1312,8 @@ 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;
@@ -1303,6 +1323,7 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 {
 	struct realtek_pci_sdmmc *host = mmc_priv(mmc);
 	struct rtsx_pcr *pcr = host->pcr;
+	struct device *dev = &host->pdev->dev;
 	int err = 0;
 
 	if (host->eject)
@@ -1313,6 +1334,7 @@ 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);
 
@@ -1345,6 +1367,8 @@ 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;
@@ -1495,12 +1519,12 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
 
 	realtek_init_host(host);
 
-	if (pcr->rtd3_en) {
-		pm_runtime_set_autosuspend_delay(&pdev->dev, 5000);
-		pm_runtime_use_autosuspend(&pdev->dev);
-		pm_runtime_enable(&pdev->dev);
-	}
-
+	pm_runtime_no_callbacks(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 200);
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_use_autosuspend(&pdev->dev);
 
 	mmc_add_host(mmc);
 
@@ -1521,11 +1545,6 @@ static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
 	pcr->slots[RTSX_SD_CARD].card_event = NULL;
 	mmc = host->mmc;
 
-	if (pcr->rtd3_en) {
-		pm_runtime_dont_use_autosuspend(&pdev->dev);
-		pm_runtime_disable(&pdev->dev);
-	}
-
 	cancel_work_sync(&host->work);
 
 	mutex_lock(&host->host_mutex);
@@ -1548,6 +1567,9 @@ static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
 
 	flush_work(&host->work);
 
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	mmc_free_host(mmc);
 
 	dev_dbg(&(pdev->dev),
-- 
2.33.1