diff mbox series

[09/14] mtd: rawnand: gpmi: use runtime PM to manage clocks

Message ID 20190521070643.6244-10-s.hauer@pengutronix.de
State Accepted
Delegated to: Miquel Raynal
Headers show
Series Implement exec_op for GPMI nand driver | expand

Commit Message

Sascha Hauer May 21, 2019, 7:06 a.m. UTC 
The gpmi driver aggressively en/disables the clocks between operations
which has significant performance cost. Use runtime PM to get rid of
this bottleneck.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 69 ++++++++++++++--------
 1 file changed, 44 insertions(+), 25 deletions(-)

Comments

Miquel Raynal June 3, 2019, 8:03 a.m. UTC | #1 
On Tue, 2019-05-21 at 07:06:38 UTC, Sascha Hauer wrote:
> The gpmi driver aggressively en/disables the clocks between operations
> which has significant performance cost. Use runtime PM to get rid of
> this bottleneck.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel
diff mbox series

Patch

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index 55b37d47804b..c9e4a27fc07a 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -14,6 +14,7 @@ 
 #include <linux/mtd/partitions.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include "gpmi-nand.h"
 #include "gpmi-regs.h"
 #include "bch-regs.h"
@@ -141,24 +142,11 @@  static int __gpmi_enable_clk(struct gpmi_nand_data *this, bool v)
 	return ret;
 }
 
-static int gpmi_enable_clk(struct gpmi_nand_data *this)
-{
-	return __gpmi_enable_clk(this, true);
-}
-
-static int gpmi_disable_clk(struct gpmi_nand_data *this)
-{
-	return __gpmi_enable_clk(this, false);
-}
-
 static int gpmi_init(struct gpmi_nand_data *this)
 {
 	struct resources *r = &this->resources;
 	int ret;
 
-	ret = gpmi_enable_clk(this);
-	if (ret)
-		return ret;
 	ret = gpmi_reset_block(r->gpmi_regs, false);
 	if (ret)
 		goto err_out;
@@ -190,10 +178,8 @@  static int gpmi_init(struct gpmi_nand_data *this)
 	 */
 	writel(BM_GPMI_CTRL1_DECOUPLE_CS, r->gpmi_regs + HW_GPMI_CTRL1_SET);
 
-	gpmi_disable_clk(this);
 	return 0;
 err_out:
-	gpmi_disable_clk(this);
 	return ret;
 }
 
@@ -561,8 +547,8 @@  static int bch_set_geometry(struct gpmi_nand_data *this)
 	page_size     = bch_geo->page_size;
 	gf_len        = bch_geo->gf_len;
 
-	ret = gpmi_enable_clk(this);
-	if (ret)
+	ret = pm_runtime_get_sync(this->dev);
+	if (ret < 0)
 		return ret;
 
 	/*
@@ -595,10 +581,11 @@  static int bch_set_geometry(struct gpmi_nand_data *this)
 	writel(BM_BCH_CTRL_COMPLETE_IRQ_EN,
 				r->bch_regs + HW_BCH_CTRL_SET);
 
-	gpmi_disable_clk(this);
-	return 0;
+	ret = 0;
 err_out:
-	gpmi_disable_clk(this);
+	pm_runtime_mark_last_busy(this->dev);
+	pm_runtime_put_autosuspend(this->dev);
+
 	return ret;
 }
 
@@ -1754,13 +1741,12 @@  static void gpmi_select_chip(struct nand_chip *chip, int chipnr)
 	 * die is selected/unselected.
 	 */
 	if (this->current_chip < 0 && chipnr >= 0) {
-		ret = gpmi_enable_clk(this);
-		if (ret)
+		ret = pm_runtime_get_sync(this->dev);
+		if (ret < 0)
 			dev_err(this->dev, "Failed to enable the clock\n");
 	} else if (this->current_chip >= 0 && chipnr < 0) {
-		ret = gpmi_disable_clk(this);
-		if (ret)
-			dev_err(this->dev, "Failed to disable the clock\n");
+		pm_runtime_mark_last_busy(this->dev);
+		pm_runtime_put_autosuspend(this->dev);
 	}
 
 	/*
@@ -2910,6 +2896,16 @@  static int gpmi_nand_probe(struct platform_device *pdev)
 	if (ret)
 		goto exit_acquire_resources;
 
+	ret = __gpmi_enable_clk(this, true);
+	if (ret)
+		goto exit_nfc_init;
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
 	ret = gpmi_init(this);
 	if (ret)
 		goto exit_nfc_init;
@@ -2918,11 +2914,16 @@  static int gpmi_nand_probe(struct platform_device *pdev)
 	if (ret)
 		goto exit_nfc_init;
 
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	dev_info(this->dev, "driver registered.\n");
 
 	return 0;
 
 exit_nfc_init:
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 	release_resources(this);
 exit_acquire_resources:
 
@@ -2933,6 +2934,9 @@  static int gpmi_nand_remove(struct platform_device *pdev)
 {
 	struct gpmi_nand_data *this = platform_get_drvdata(pdev);
 
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	nand_release(&this->nand);
 	gpmi_free_dma_buffer(this);
 	release_resources(this);
@@ -2975,8 +2979,23 @@  static int gpmi_pm_resume(struct device *dev)
 }
 #endif /* CONFIG_PM_SLEEP */
 
+static int __maybe_unused gpmi_runtime_suspend(struct device *dev)
+{
+	struct gpmi_nand_data *this = dev_get_drvdata(dev);
+
+	return __gpmi_enable_clk(this, false);
+}
+
+static int __maybe_unused gpmi_runtime_resume(struct device *dev)
+{
+	struct gpmi_nand_data *this = dev_get_drvdata(dev);
+
+	return __gpmi_enable_clk(this, true);
+}
+
 static const struct dev_pm_ops gpmi_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(gpmi_pm_suspend, gpmi_pm_resume)
+	SET_RUNTIME_PM_OPS(gpmi_runtime_suspend, gpmi_runtime_resume, NULL)
 };
 
 static struct platform_driver gpmi_nand_driver = {