From: Manikandan Muralidharan <manikandan.m@microchip.com>
To: <sam@ravnborg.org>, <bbrezillon@kernel.org>,
<maarten.lankhorst@linux.intel.com>, <mripard@kernel.org>,
<tzimmermann@suse.de>, <airlied@gmail.com>, <daniel@ffwll.ch>,
<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<claudiu.beznea@tuxon.dev>, <lee@kernel.org>,
<dri-devel@lists.freedesktop.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Cc: <Hari.PrasathGE@microchip.com>,
<Balamanikandan.Gunasundar@microchip.com>,
<Durai.ManickamKR@microchip.com>,
<Nayabbasha.Sayed@microchip.com>, <Dharma.B@microchip.com>,
<Varshini.Rajendran@microchip.com>,
<Balakrishnan.S@microchip.com>, <Charan.Pedumuru@microchip.com>,
"Manikandan Muralidharan" <manikandan.m@microchip.com>
Subject: [PATCH v9 3/8] drm: atmel_hlcdc: replace regmap_read with regmap_read_poll_timeout
Date: Fri, 1 Mar 2024 10:55:29 +0530 [thread overview]
Message-ID: <20240301052534.38651-4-manikandan.m@microchip.com> (raw)
In-Reply-To: <20240301052534.38651-1-manikandan.m@microchip.com>
Replace regmap_read with regmap_read_poll_timeout to neatly handle
retries
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.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
next prev parent reply other threads:[~2024-03-01 5:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-01 5:25 [PATCH v9 0/8] Add support for XLCDC to sam9x7 SoC family Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 1/8] drm: atmel-hlcdc: add driver ops to differentiate HLCDC and XLCDC IP Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 2/8] drm: atmel-hlcdc: Define XLCDC specific registers Manikandan Muralidharan
2024-03-01 9:19 ` Lee Jones
2024-03-01 5:25 ` Manikandan Muralidharan [this message]
2024-03-01 5:25 ` [PATCH v9 4/8] drm: atmel_hlcdc: Add support for XLCDC using IP specific driver ops Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 5/8] drm: atmel-hlcdc: add DPI mode support for XLCDC Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 6/8] drm: atmel-hlcdc: add vertical and horizontal scaling " Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 7/8] drm: atmel-hlcdc: add support for DSI output formats Manikandan Muralidharan
2024-03-01 5:25 ` [PATCH v9 8/8] drm: atmel-hlcdc: add LCD controller layer definition for sam9x75 Manikandan Muralidharan
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