From: Rajeev Nandan <rajeevny@codeaurora.org>
To: y@qualcomm.com, dri-devel@lists.freedesktop.org,
linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
devicetree@vger.kernel.org
Cc: Rajeev Nandan <rajeevny@codeaurora.org>,
linux-kernel@vger.kernel.org, thierry.reding@gmail.com,
sam@ravnborg.org, robdclark@gmail.com, dianders@chromium.org,
lyude@redhat.com, jani.nikula@intel.com, robh@kernel.org,
laurent.pinchart@ideasonboard.com, a.hajda@samsung.com,
daniel.thompson@linaro.org, hoegsberg@chromium.org,
abhinavk@codeaurora.org, seanpaul@chromium.org,
kalyan_t@codeaurora.org, mkrishn@codeaurora.org
Subject: [v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator
Date: Tue, 25 May 2021 13:00:29 +0530 [thread overview]
Message-ID: <1621927831-29471-3-git-send-email-rajeevny@codeaurora.org> (raw)
In-Reply-To: <1621927831-29471-1-git-send-email-rajeevny@codeaurora.org>
Some panels datasheets may specify a delay between the enable GPIO and
the regulator. Support this in panel-simple.
Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
---
Changes in v4:
- New
drivers/gpu/drm/panel/panel-simple.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index f9e4e60..caed71b 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -134,6 +134,22 @@ struct panel_desc {
unsigned int prepare_to_enable;
/**
+ * @delay.power_to_enable: Time for the power to enable the display on.
+ *
+ * The time (in milliseconds) that it takes for the panel to
+ * turn the display on.
+ */
+ unsigned int power_to_enable;
+
+ /**
+ * @delay.disable_to_power_off: Time for the disable to power the display off.
+ *
+ * The time (in milliseconds) that it takes for the panel to
+ * turn the display off.
+ */
+ unsigned int disable_to_power_off;
+
+ /**
* @delay.enable: Time for the panel to display a valid frame.
*
* The time (in milliseconds) that it takes for the panel to
@@ -367,6 +383,10 @@ static int panel_simple_suspend(struct device *dev)
struct panel_simple *p = dev_get_drvdata(dev);
gpiod_set_value_cansleep(p->enable_gpio, 0);
+
+ if (p->desc->delay.disable_to_power_off)
+ msleep(p->desc->delay.disable_to_power_off);
+
regulator_disable(p->supply);
p->unprepared_time = ktime_get();
@@ -427,6 +447,9 @@ static int panel_simple_prepare_once(struct panel_simple *p)
return err;
}
+ if (p->desc->delay.power_to_enable)
+ msleep(p->desc->delay.power_to_enable);
+
gpiod_set_value_cansleep(p->enable_gpio, 1);
delay = p->desc->delay.prepare;
--
2.7.4
next prev parent reply other threads:[~2021-05-25 7:31 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 7:30 [v4 0/4] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20 Rajeev Nandan
2021-05-25 7:30 ` [v4 1/4] drm/panel-simple: Add basic DPCD backlight support Rajeev Nandan
2021-05-25 11:41 ` kernel test robot
2021-05-25 17:18 ` Doug Anderson
2021-05-27 12:21 ` rajeevny
2021-05-27 21:41 ` Doug Anderson
2021-06-01 18:28 ` Lyude Paul
2021-06-01 22:20 ` Lyude Paul
2021-06-02 5:38 ` rajeevny
2021-06-08 21:02 ` Doug Anderson
2021-05-25 7:30 ` Rajeev Nandan [this message]
2021-05-25 17:18 ` [v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator Doug Anderson
2021-05-25 7:30 ` [v4 3/4] dt-bindings: display: simple: Add Samsung ATNA33XC20 Rajeev Nandan
2021-05-25 17:19 ` Doug Anderson
2021-05-25 7:30 ` [v4 4/4] drm/panel-simple: " Rajeev Nandan
2021-05-25 17:19 ` Doug Anderson
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