From: shengfei Xu <xsf@rock-chips.com>
Date: Wed, 16 Feb 2022 01:40:27 +0000 (+0800)
Subject: spi: rockchip: Suspend and resume the bus during NOIRQ_SYSTEM_SLEEP_PM ops
X-Git-Tag: v6.1-rc5~1800^2~46^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e882575efc771f130a24322377dc1033551da11d;p=platform%2Fkernel%2Flinux-starfive.git

spi: rockchip: Suspend and resume the bus during NOIRQ_SYSTEM_SLEEP_PM ops

the wakeup interrupt handler which is guaranteed not to run while
@resume noirq() is being executed. the patch can help to avoid the
wakeup source try to access spi when the spi is in suspend mode.

Signed-off-by: shengfei Xu <xsf@rock-chips.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20220216014028.8123-6-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 83da8fd..8b4d56e 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -964,14 +964,14 @@ static int rockchip_spi_suspend(struct device *dev)
 {
 	int ret;
 	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
 
 	ret = spi_controller_suspend(ctlr);
 	if (ret < 0)
 		return ret;
 
-	ret = pm_runtime_force_suspend(dev);
-	if (ret < 0)
-		return ret;
+	clk_disable_unprepare(rs->spiclk);
+	clk_disable_unprepare(rs->apb_pclk);
 
 	pinctrl_pm_select_sleep_state(dev);
 
@@ -986,10 +986,14 @@ static int rockchip_spi_resume(struct device *dev)
 
 	pinctrl_pm_select_default_state(dev);
 
-	ret = pm_runtime_force_resume(dev);
+	ret = clk_prepare_enable(rs->apb_pclk);
 	if (ret < 0)
 		return ret;
 
+	ret = clk_prepare_enable(rs->spiclk);
+	if (ret < 0)
+		clk_disable_unprepare(rs->apb_pclk);
+
 	ret = spi_controller_resume(ctlr);
 	if (ret < 0) {
 		clk_disable_unprepare(rs->spiclk);
@@ -1031,7 +1035,7 @@ static int rockchip_spi_runtime_resume(struct device *dev)
 #endif /* CONFIG_PM */
 
 static const struct dev_pm_ops rockchip_spi_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
 	SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
 			   rockchip_spi_runtime_resume, NULL)
 };