linux-kernel - [PATCH 2/4] drm: panel: sofef00: remove reset GPIO handling

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Date:   Sun, 02 May 2021 01:42:52 +0000
From:   Caleb Connolly <caleb@...nolly.tech>
To:     caleb@...nolly.tech, Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] drm: panel: sofef00: remove reset GPIO handling

Resetting the panel on fajita causes it to never come back, we aren't
quite sure why this is so for now lets remove reset handling as it is
effectively broken. It is also not needed on enchilada.

Signed-off-by: Caleb Connolly <caleb@...nolly.tech>
---
 drivers/gpu/drm/panel/panel-samsung-sofef00.c | 26 +++----------------
 1 file changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
index 8cb1853574bb..cfc8b2a19742 100644
--- a/drivers/gpu/drm/panel/panel-samsung-sofef00.c
+++ b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
@@ -23,7 +23,6 @@ struct sofef00_panel {
 	struct drm_panel panel;
 	struct mipi_dsi_device *dsi;
 	struct regulator *supply;
-	struct gpio_desc *reset_gpio;
 	const struct drm_display_mode *mode;
 	bool prepared;
 };
@@ -42,16 +41,6 @@ struct sofef00_panel *to_sofef00_panel(struct drm_panel *panel)
 			return ret;					\
 	} while (0)
 
-static void sofef00_panel_reset(struct sofef00_panel *ctx)
-{
-	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
-	usleep_range(5000, 6000);
-	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
-	usleep_range(2000, 3000);
-	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
-	usleep_range(12000, 13000);
-}
-
 static int sofef00_panel_on(struct sofef00_panel *ctx)
 {
 	struct mipi_dsi_device *dsi = ctx->dsi;
@@ -132,12 +121,9 @@ static int sofef00_panel_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	sofef00_panel_reset(ctx);
-
 	ret = sofef00_panel_on(ctx);
 	if (ret < 0) {
 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
-		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 		return ret;
 	}
 
@@ -155,8 +141,11 @@ static int sofef00_panel_unprepare(struct drm_panel *panel)
 		return 0;
 
 	ret = sofef00_panel_off(ctx);
-	if (ret < 0)
+
+	if (ret < 0) {
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+		return ret;
+	}
 
 	regulator_disable(ctx->supply);
 
@@ -276,13 +265,6 @@ static int sofef00_panel_probe(struct mipi_dsi_device *dsi)
 		return ret;
 	}
 
-	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(ctx->reset_gpio)) {
-		ret = PTR_ERR(ctx->reset_gpio);
-		dev_warn(dev, "Failed to get reset-gpios: %d\n", ret);
-		return ret;
-	}
-
 	ctx->dsi = dsi;
 	mipi_dsi_set_drvdata(dsi, ctx);
 
-- 
2.30.2