1 files changed, 56 insertions, 59 deletions

diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index c605013e4114..bafd6b6195f6 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -11,7 +11,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 #include <linux/slab.h>
@@ -43,7 +42,6 @@ struct mtk_pwm_data {
 };
 
 struct mtk_disp_pwm {
-	struct pwm_chip chip;
 	const struct mtk_pwm_data *data;
 	struct clk *clk_main;
 	struct clk *clk_mm;
@@ -53,7 +51,7 @@ struct mtk_disp_pwm {
 
 static inline struct mtk_disp_pwm *to_mtk_disp_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct mtk_disp_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void mtk_disp_pwm_update_bits(struct mtk_disp_pwm *mdp, u32 offset,
@@ -79,14 +77,11 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (state->polarity != PWM_POLARITY_NORMAL)
 		return -EINVAL;
 
-	if (!state->enabled) {
-		mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,
-					 0x0);
-
-		if (mdp->enabled) {
-			clk_disable_unprepare(mdp->clk_mm);
-			clk_disable_unprepare(mdp->clk_main);
-		}
+	if (!state->enabled && mdp->enabled) {
+		mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN,
+					 mdp->data->enable_mask, 0x0);
+		clk_disable_unprepare(mdp->clk_mm);
+		clk_disable_unprepare(mdp->clk_main);
 
 		mdp->enabled = false;
 		return 0;
@@ -95,14 +90,14 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (!mdp->enabled) {
 		err = clk_prepare_enable(mdp->clk_main);
 		if (err < 0) {
-			dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n",
+			dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_main: %pe\n",
 				ERR_PTR(err));
 			return err;
 		}
 
 		err = clk_prepare_enable(mdp->clk_mm);
 		if (err < 0) {
-			dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n",
+			dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_mm: %pe\n",
 				ERR_PTR(err));
 			clk_disable_unprepare(mdp->clk_main);
 			return err;
@@ -138,6 +133,19 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	high_width = mul_u64_u64_div_u64(state->duty_cycle, rate, div);
 	value = period | (high_width << PWM_HIGH_WIDTH_SHIFT);
 
+	if (mdp->data->bls_debug && !mdp->data->has_commit) {
+		/*
+		 * For MT2701, disable double buffer before writing register
+		 * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH.
+		 */
+		mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
+					 mdp->data->bls_debug_mask,
+					 mdp->data->bls_debug_mask);
+		mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
+					 mdp->data->con0_sel,
+					 mdp->data->con0_sel);
+	}
+
 	mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
 				 PWM_CLKDIV_MASK,
 				 clk_div << PWM_CLKDIV_SHIFT);
@@ -152,17 +160,6 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		mtk_disp_pwm_update_bits(mdp, mdp->data->commit,
 					 mdp->data->commit_mask,
 					 0x0);
-	} else {
-		/*
-		 * For MT2701, disable double buffer before writing register
-		 * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH.
-		 */
-		mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
-					 mdp->data->bls_debug_mask,
-					 mdp->data->bls_debug_mask);
-		mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
-					 mdp->data->con0_sel,
-					 mdp->data->con0_sel);
 	}
 
 	mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,
@@ -172,32 +169,43 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	return 0;
 }
 
-static void mtk_disp_pwm_get_state(struct pwm_chip *chip,
-				   struct pwm_device *pwm,
-				   struct pwm_state *state)
+static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
+				  struct pwm_device *pwm,
+				  struct pwm_state *state)
 {
 	struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
 	u64 rate, period, high_width;
-	u32 clk_div, con0, con1;
+	u32 clk_div, pwm_en, con0, con1;
 	int err;
 
 	err = clk_prepare_enable(mdp->clk_main);
 	if (err < 0) {
-		dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err));
-		return;
+		dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err));
+		return err;
 	}
 
 	err = clk_prepare_enable(mdp->clk_mm);
 	if (err < 0) {
-		dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err));
+		dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err));
 		clk_disable_unprepare(mdp->clk_main);
-		return;
+		return err;
 	}
 
+	/*
+	 * Apply DISP_PWM_DEBUG settings to choose whether to enable or disable
+	 * registers double buffer and manual commit to working register before
+	 * performing any read/write operation
+	 */
+	if (mdp->data->bls_debug)
+		mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
+					 mdp->data->bls_debug_mask,
+					 mdp->data->bls_debug_mask);
+
 	rate = clk_get_rate(mdp->clk_main);
 	con0 = readl(mdp->base + mdp->data->con0);
 	con1 = readl(mdp->base + mdp->data->con1);
-	state->enabled = !!(con0 & BIT(0));
+	pwm_en = readl(mdp->base + DISP_PWM_EN);
+	state->enabled = !!(pwm_en & mdp->data->enable_mask);
 	clk_div = FIELD_GET(PWM_CLKDIV_MASK, con0);
 	period = FIELD_GET(PWM_PERIOD_MASK, con1);
 	/*
@@ -211,22 +219,25 @@ static void mtk_disp_pwm_get_state(struct pwm_chip *chip,
 	state->polarity = PWM_POLARITY_NORMAL;
 	clk_disable_unprepare(mdp->clk_mm);
 	clk_disable_unprepare(mdp->clk_main);
+
+	return 0;
 }
 
 static const struct pwm_ops mtk_disp_pwm_ops = {
 	.apply = mtk_disp_pwm_apply,
 	.get_state = mtk_disp_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int mtk_disp_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct mtk_disp_pwm *mdp;
 	int ret;
 
-	mdp = devm_kzalloc(&pdev->dev, sizeof(*mdp), GFP_KERNEL);
-	if (!mdp)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*mdp));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	mdp = to_mtk_disp_pwm(chip);
 
 	mdp->data = of_device_get_match_data(&pdev->dev);
 
@@ -236,32 +247,19 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
 
 	mdp->clk_main = devm_clk_get(&pdev->dev, "main");
 	if (IS_ERR(mdp->clk_main))
-		return PTR_ERR(mdp->clk_main);
+		return dev_err_probe(&pdev->dev, PTR_ERR(mdp->clk_main),
+				     "Failed to get main clock\n");
 
 	mdp->clk_mm = devm_clk_get(&pdev->dev, "mm");
 	if (IS_ERR(mdp->clk_mm))
-		return PTR_ERR(mdp->clk_mm);
-
-	mdp->chip.dev = &pdev->dev;
-	mdp->chip.ops = &mtk_disp_pwm_ops;
-	mdp->chip.npwm = 1;
-
-	ret = pwmchip_add(&mdp->chip);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "pwmchip_add() failed: %pe\n", ERR_PTR(ret));
-		return ret;
-	}
+		return dev_err_probe(&pdev->dev, PTR_ERR(mdp->clk_mm),
+				     "Failed to get mm clock\n");
 
-	platform_set_drvdata(pdev, mdp);
-
-	return 0;
-}
-
-static int mtk_disp_pwm_remove(struct platform_device *pdev)
-{
-	struct mtk_disp_pwm *mdp = platform_get_drvdata(pdev);
+	chip->ops = &mtk_disp_pwm_ops;
 
-	pwmchip_remove(&mdp->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");
 
 	return 0;
 }
@@ -311,7 +309,6 @@ static struct platform_driver mtk_disp_pwm_driver = {
 		.of_match_table = mtk_disp_pwm_of_match,
 	},
 	.probe = mtk_disp_pwm_probe,
-	.remove = mtk_disp_pwm_remove,
 };
 module_platform_driver(mtk_disp_pwm_driver);