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Message-Id: <20210901131531.v3.10.I77d7a48df0a6585ef2cc2ff140fbe8f236a9a9f7@changeid>
Date: Wed, 1 Sep 2021 13:19:28 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Thierry Reding <thierry.reding@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Sam Ravnborg <sam@...nborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
linux-arm-msm@...r.kernel.org,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Linus W <linus.walleij@...aro.org>,
Daniel Vetter <daniel@...ll.ch>, devicetree@...r.kernel.org,
Steev Klimaszewski <steev@...i.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Maxime Ripard <mripard@...nel.org>,
David Airlie <airlied@...ux.ie>,
dri-devel@...ts.freedesktop.org,
Douglas Anderson <dianders@...omium.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 10/16] drm/panel-simple: Non-eDP panels don't need "HPD" handling
All of the "HPD" handling added to panel-simple recently was for eDP
panels. Remove it from panel-simple now that panel-simple-edp handles
eDP panels. The "prepare_to_enable" delay only makes sense in the
context of HPD, so remove it too. No non-eDP panels used it anyway.
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
Changes in v3:
- ("Non-eDP panels don't need "HPD" handling") new for v3.
drivers/gpu/drm/panel/panel-simple.c | 134 +--------------------------
1 file changed, 4 insertions(+), 130 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index dcfec124d69d..abec01d9798e 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -23,7 +23,6 @@
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
-#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@@ -92,44 +91,6 @@ struct panel_desc {
*/
unsigned int prepare;
- /**
- * @delay.hpd_absent_delay: Time to wait if HPD isn't hooked up.
- *
- * Add this to the prepare delay if we know Hot Plug Detect
- * isn't used.
- */
- unsigned int hpd_absent_delay;
-
- /**
- * @delay.prepare_to_enable: Time between prepare and enable.
- *
- * The minimum time, in milliseconds, that needs to have passed
- * between when prepare finished and enable may begin. If at
- * enable time less time has passed since prepare finished,
- * the driver waits for the remaining time.
- *
- * If a fixed enable delay is also specified, we'll start
- * counting before delaying for the fixed delay.
- *
- * If a fixed prepare delay is also specified, we won't start
- * counting until after the fixed delay. We can't overlap this
- * fixed delay with the min time because the fixed delay
- * doesn't happen at the end of the function if a HPD GPIO was
- * specified.
- *
- * In other words:
- * prepare()
- * ...
- * // do fixed prepare delay
- * // wait for HPD GPIO if applicable
- * // start counting for prepare_to_enable
- *
- * enable()
- * // do fixed enable delay
- * // enforce prepare_to_enable min time
- */
- unsigned int prepare_to_enable;
-
/**
* @delay.enable: Time for the panel to display a valid frame.
*
@@ -174,7 +135,6 @@ struct panel_desc {
struct panel_simple {
struct drm_panel base;
bool enabled;
- bool no_hpd;
bool prepared;
@@ -187,7 +147,6 @@ struct panel_simple {
struct i2c_adapter *ddc;
struct gpio_desc *enable_gpio;
- struct gpio_desc *hpd_gpio;
struct edid *edid;
@@ -371,30 +330,10 @@ static int panel_simple_unprepare(struct drm_panel *panel)
return 0;
}
-static int panel_simple_get_hpd_gpio(struct device *dev, struct panel_simple *p)
-{
- int err;
-
- p->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
- if (IS_ERR(p->hpd_gpio)) {
- err = PTR_ERR(p->hpd_gpio);
-
- if (err != -EPROBE_DEFER)
- dev_err(dev, "failed to get 'hpd' GPIO: %d\n", err);
-
- return err;
- }
-
- return 0;
-}
-
-static int panel_simple_prepare_once(struct panel_simple *p)
+static int panel_simple_resume(struct device *dev)
{
- struct device *dev = p->base.dev;
- unsigned int delay;
+ struct panel_simple *p = dev_get_drvdata(dev);
int err;
- int hpd_asserted;
- unsigned long hpd_wait_us;
panel_simple_wait(p->unprepared_time, p->desc->delay.unprepare);
@@ -406,68 +345,12 @@ static int panel_simple_prepare_once(struct panel_simple *p)
gpiod_set_value_cansleep(p->enable_gpio, 1);
- delay = p->desc->delay.prepare;
- if (p->no_hpd)
- delay += p->desc->delay.hpd_absent_delay;
- if (delay)
- msleep(delay);
-
- if (p->hpd_gpio) {
- if (p->desc->delay.hpd_absent_delay)
- hpd_wait_us = p->desc->delay.hpd_absent_delay * 1000UL;
- else
- hpd_wait_us = 2000000;
-
- err = readx_poll_timeout(gpiod_get_value_cansleep, p->hpd_gpio,
- hpd_asserted, hpd_asserted,
- 1000, hpd_wait_us);
- if (hpd_asserted < 0)
- err = hpd_asserted;
-
- if (err) {
- if (err != -ETIMEDOUT)
- dev_err(dev,
- "error waiting for hpd GPIO: %d\n", err);
- goto error;
- }
- }
+ if (p->desc->delay.prepare)
+ msleep(p->desc->delay.prepare);
p->prepared_time = ktime_get();
return 0;
-
-error:
- gpiod_set_value_cansleep(p->enable_gpio, 0);
- regulator_disable(p->supply);
- p->unprepared_time = ktime_get();
-
- return err;
-}
-
-/*
- * Some panels simply don't always come up and need to be power cycled to
- * work properly. We'll allow for a handful of retries.
- */
-#define MAX_PANEL_PREPARE_TRIES 5
-
-static int panel_simple_resume(struct device *dev)
-{
- struct panel_simple *p = dev_get_drvdata(dev);
- int ret;
- int try;
-
- for (try = 0; try < MAX_PANEL_PREPARE_TRIES; try++) {
- ret = panel_simple_prepare_once(p);
- if (ret != -ETIMEDOUT)
- break;
- }
-
- if (ret == -ETIMEDOUT)
- dev_err(dev, "Prepare timeout after %d tries\n", try);
- else if (try)
- dev_warn(dev, "Prepare needed %d retries\n", try);
-
- return ret;
}
static int panel_simple_prepare(struct drm_panel *panel)
@@ -500,8 +383,6 @@ static int panel_simple_enable(struct drm_panel *panel)
if (p->desc->delay.enable)
msleep(p->desc->delay.enable);
- panel_simple_wait(p->prepared_time, p->desc->delay.prepare_to_enable);
-
p->enabled = true;
return 0;
@@ -674,13 +555,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
panel->prepared_time = 0;
panel->desc = desc;
- panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");
- if (!panel->no_hpd) {
- err = panel_simple_get_hpd_gpio(dev, panel);
- if (err)
- return err;
- }
-
panel->supply = devm_regulator_get(dev, "power");
if (IS_ERR(panel->supply))
return PTR_ERR(panel->supply);
--
2.33.0.259.gc128427fd7-goog
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