linux-kernel - [PATCH RESEND v9 3/8] drm: atmel_hlcdc: replace regmap_read with regmap_read_poll

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Date: Wed, 24 Apr 2024 11:03:46 +0530
From: Manikandan Muralidharan <manikandan.m@...rochip.com>
To: <sam@...nborg.org>, <bbrezillon@...nel.org>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <lee@...nel.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <Hari.PrasathGE@...rochip.com>, <Balamanikandan.Gunasundar@...rochip.com>,
	<Durai.ManickamKR@...rochip.com>, <Nayabbasha.Sayed@...rochip.com>,
	<Dharma.B@...rochip.com>, <Varshini.Rajendran@...rochip.com>,
	<Balakrishnan.S@...rochip.com>, <Charan.Pedumuru@...rochip.com>, "Manikandan
 Muralidharan" <manikandan.m@...rochip.com>
Subject: [PATCH RESEND v9 3/8] drm: atmel_hlcdc: replace regmap_read with regmap_read_poll_timeout

Replace regmap_read with regmap_read_poll_timeout to neatly handle
retries

Signed-off-by: Manikandan Muralidharan <manikandan.m@...rochip.com>
---
 .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c    | 44 +++++++++++--------
 1 file changed, 25 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index cc5cf4c2faf7..b229692a27ca 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -203,19 +203,22 @@ static void atmel_hlcdc_crtc_atomic_disable(struct drm_crtc *c,
 	pm_runtime_get_sync(dev->dev);
 
 	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       (status & ATMEL_HLCDC_DISP))
-		cpu_relax();
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     !(status & ATMEL_HLCDC_DISP),
+				    10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n");
 
 	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       (status & ATMEL_HLCDC_SYNC))
-		cpu_relax();
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     !(status & ATMEL_HLCDC_SYNC),
+				    10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n");
 
 	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       (status & ATMEL_HLCDC_PIXEL_CLK))
-		cpu_relax();
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     !(status & ATMEL_HLCDC_PIXEL_CLK),
+				    10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n");
 
 	clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
 	pinctrl_pm_select_sleep_state(dev->dev);
@@ -241,20 +244,23 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
 	clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
 
 	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       !(status & ATMEL_HLCDC_PIXEL_CLK))
-		cpu_relax();
-
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     status & ATMEL_HLCDC_PIXEL_CLK,
+				     10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n");
 
 	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       !(status & ATMEL_HLCDC_SYNC))
-		cpu_relax();
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     status & ATMEL_HLCDC_SYNC,
+				     10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n");
 
 	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
-	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
-	       !(status & ATMEL_HLCDC_DISP))
-		cpu_relax();
+	if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status,
+				     status & ATMEL_HLCDC_DISP,
+				     10, 1000))
+		dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n");
+
 
 	pm_runtime_put_sync(dev->dev);
 
-- 
2.25.1