From: Rajeev Nandan <rajeevny@codeaurora.org>
To: 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: [v7 3/5] drm/panel-simple: Support for delays between GPIO & regulator
Date: Sat, 19 Jun 2021 16:10:28 +0530 [thread overview]
Message-ID: <1624099230-20899-4-git-send-email-rajeevny@codeaurora.org> (raw)
In-Reply-To: <1624099230-20899-1-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>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---
(no changes since v6)
Changes in v4:
- New
Changes in v5:
- Update description (Douglas)
- Warn if "power_to_enable" or "disable_to_power_off" is non-zero and panel->enable_gpio
is NULL (Douglas)
Changes in v6:
- Update warning message to make it more meaningful. (Douglas)
drivers/gpu/drm/panel/panel-simple.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 26555ec..86e5a45 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -133,6 +133,22 @@ 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) to wait after powering up the display
+ * before asserting its enable pin.
+ */
+ unsigned int power_to_enable;
+
+ /**
+ * @delay.disable_to_power_off: Time for the disable to power the display off.
+ *
+ * The time (in milliseconds) to wait before powering off the display
+ * after deasserting its enable pin.
+ */
+ 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
@@ -347,6 +363,10 @@ 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();
@@ -407,6 +427,9 @@ 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;
@@ -782,6 +805,11 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
break;
}
+ if (!panel->enable_gpio && desc->delay.disable_to_power_off)
+ dev_warn(dev, "Need a delay after disabling panel GPIO, but a GPIO wasn't provided\n");
+ if (!panel->enable_gpio && desc->delay.power_to_enable)
+ dev_warn(dev, "Need a delay before enabling panel GPIO, but a GPIO wasn't provided\n");
+
dev_set_drvdata(dev, panel);
/*
--
2.7.4
next prev parent reply other threads:[~2021-06-19 10:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-19 10:40 [v7 0/5] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20 Rajeev Nandan
2021-06-19 10:40 ` [v7 1/5] drm/panel: add basic DP AUX backlight support Rajeev Nandan
[not found] ` <20210620093141.GA703072@ravnborg.org>
2021-06-21 8:38 ` rajeevny
[not found] ` <20210621183828.GA918146@ravnborg.org>
2021-06-22 18:33 ` Doug Anderson
2021-06-23 6:15 ` rajeevny
2021-06-19 10:40 ` [v7 2/5] drm/panel-simple: Support DP AUX backlight Rajeev Nandan
2021-06-19 10:40 ` Rajeev Nandan [this message]
2021-06-19 10:40 ` [v7 4/5] dt-bindings: display: simple: Add Samsung ATNA33XC20 Rajeev Nandan
2021-06-19 10:40 ` [v7 5/5] drm/panel-simple: " Rajeev Nandan
[not found] ` <20210620100147.GB703072@ravnborg.org>
2021-06-21 15:34 ` Doug Anderson
[not found] ` <20210621184157.GB918146@ravnborg.org>
2021-06-22 18:36 ` Doug Anderson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1624099230-20899-4-git-send-email-rajeevny@codeaurora.org \
--to=rajeevny@codeaurora.org \
--cc=a.hajda@samsung.com \
--cc=abhinavk@codeaurora.org \
--cc=daniel.thompson@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=dianders@chromium.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=freedreno@lists.freedesktop.org \
--cc=hoegsberg@chromium.org \
--cc=jani.nikula@intel.com \
--cc=kalyan_t@codeaurora.org \
--cc=laurent.pinchart@ideasonboard.com \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lyude@redhat.com \
--cc=mkrishn@codeaurora.org \
--cc=robdclark@gmail.com \
--cc=robh@kernel.org \
--cc=sam@ravnborg.org \
--cc=seanpaul@chromium.org \
--cc=thierry.reding@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).