From: "Guido Günther" <agx@sigxcpu.org>
To: Thierry Reding <thierry.reding@gmail.com>,
Sam Ravnborg <sam@ravnborg.org>, David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>, Rob Herring <robh+dt@kernel.org>,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/3] drm/panel: mantix: Fix panel reset
Date: Tue, 13 Oct 2020 12:32:47 +0200 [thread overview]
Message-ID: <ba71a8ab010d263a8058dd4f711e3bcd95877bf2.1602584953.git.agx@sigxcpu.org> (raw)
In-Reply-To: <cover.1602584953.git.agx@sigxcpu.org>
The mantix panel needs two reset lines (RESX and TP_RSTN) deasserted to
output an image. Only deasserting RESX is not enough and the display
will stay blank. Deassert in prepare() and assert in unprepare() to keep
device held in reset when off.
Signed-off-by: Guido Günther <agx@sigxcpu.org>
---
.../gpu/drm/panel/panel-mantix-mlaf057we51.c | 23 +++++++++++++------
1 file changed, 16 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
index 4a7fbf64bb7a..0c5f22e95c2d 100644
--- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
+++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
@@ -26,7 +26,9 @@
struct mantix {
struct device *dev;
struct drm_panel panel;
+
struct gpio_desc *reset_gpio;
+ struct gpio_desc *tp_rstn_gpio;
struct regulator *avdd;
struct regulator *avee;
@@ -124,6 +126,10 @@ static int mantix_unprepare(struct drm_panel *panel)
{
struct mantix *ctx = panel_to_mantix(panel);
+ gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 1);
+ usleep_range(5000, 6000);
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
regulator_disable(ctx->avee);
regulator_disable(ctx->avdd);
/* T11 */
@@ -165,13 +171,10 @@ static int mantix_prepare(struct drm_panel *panel)
return ret;
}
- /* T3+T5 */
- usleep_range(10000, 12000);
-
- gpiod_set_value_cansleep(ctx->reset_gpio, 1);
- usleep_range(5150, 7000);
-
+ /* T3 + T4 + time for voltage to become stable: */
+ usleep_range(6000, 7000);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+ gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 0);
/* T6 */
msleep(50);
@@ -236,12 +239,18 @@ static int mantix_probe(struct mipi_dsi_device *dsi)
if (!ctx)
return -ENOMEM;
- ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ctx->reset_gpio)) {
dev_err(dev, "cannot get reset gpio\n");
return PTR_ERR(ctx->reset_gpio);
}
+ ctx->tp_rstn_gpio = devm_gpiod_get(dev, "mantix,tp-rstn", GPIOD_OUT_HIGH);
+ if (IS_ERR(ctx->tp_rstn_gpio)) {
+ dev_err(dev, "cannot get tp-rstn gpio\n");
+ return PTR_ERR(ctx->tp_rstn_gpio);
+ }
+
mipi_dsi_set_drvdata(dsi, ctx);
ctx->dev = dev;
--
2.28.0
next prev parent reply other threads:[~2020-10-13 10:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 10:32 [PATCH v2 0/3] drm/panel: mantix panel reset fixes Guido Günther
2020-10-13 10:32 ` [PATCH v2 1/3] drm/panel: mantix: Don't dereference NULL mode Guido Günther
2020-10-13 10:32 ` Guido Günther [this message]
2020-10-13 10:32 ` [PATCH v2 3/3] dt-binding: display: Require two resets on mantix panel Guido Günther
2020-10-16 14:29 ` [PATCH v2 0/3] drm/panel: mantix panel reset fixes Sam Ravnborg
2020-10-17 9:13 ` Guido Günther
2020-10-17 10:47 ` Sam Ravnborg
2020-10-18 13:01 ` Guido Günther
2020-10-18 13:38 ` Sam Ravnborg
2020-10-19 14:39 ` Guido Günther
2020-10-19 15:44 ` Daniel Vetter
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