Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Douglas Anderson <dianders@chromium.org>
To:     dri-devel@lists.freedesktop.org, Maxime Ripard <mripard@kernel.org>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Douglas Anderson <dianders@chromium.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@gmail.com>,
        Jianhua Lu <lujianhua000@gmail.com>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Sam Ravnborg <sam@ravnborg.org>, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 01/10] drm/panel: Don't store+check prepared/enabled for simple cases
Date:   Fri,  4 Aug 2023 14:06:04 -0700
Message-ID: <20230804140605.RFC.1.Ia54954fd2f7645c1b86597494902973f57feeb71@changeid>
In-Reply-To: <20230804210644.1862287-1-dianders@chromium.org>
References: <20230804210644.1862287-1-dianders@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

As talked about in commit d2aacaf07395 ("drm/panel: Check for already
prepared/enabled in drm_panel"), we want to remove needless code from
panel drivers that was storing and double-checking the
prepared/enabled state. Even if someone was relying on the
double-check before, that double-check is now in the core and not
needed in individual drivers.

This pile of panel drivers appears to be simple to handle. Based on
code inspection they seemed to be using the prepared/enabled state
simply for double-checking that nothing else in the kernel called them
inconsistently. Now that the core drm_panel is doing the double
checking (and warning) it should be very clear that these devices
don't need their own double-check.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 .../drm/panel/panel-asus-z00t-tm5p5-n35596.c  |  9 -----
 .../gpu/drm/panel/panel-boe-bf060y8m-aj0.c    |  9 -----
 drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c  |  9 -----
 drivers/gpu/drm/panel/panel-novatek-nt35950.c |  9 -----
 drivers/gpu/drm/panel/panel-novatek-nt36523.c | 12 ------
 drivers/gpu/drm/panel/panel-raydium-rm68200.c | 38 -------------------
 .../panel/panel-samsung-s6e88a0-ams452ef01.c  | 10 -----
 drivers/gpu/drm/panel/panel-samsung-sofef00.c |  9 -----
 .../gpu/drm/panel/panel-sharp-ls060t1sx01.c   | 10 -----
 drivers/gpu/drm/panel/panel-sony-td4353-jdi.c |  9 -----
 .../panel/panel-sony-tulip-truly-nt35521.c    | 18 ---------
 .../drm/panel/panel-startek-kd070fhfid015.c   | 11 ------
 drivers/gpu/drm/panel/panel-truly-nt35597.c   | 20 ----------
 drivers/gpu/drm/panel/panel-visionox-r66451.c | 16 --------
 .../gpu/drm/panel/panel-visionox-rm69299.c    |  8 ----
 .../gpu/drm/panel/panel-visionox-vtdr6130.c   |  9 -----
 16 files changed, 206 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c b/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
index 075a7af81eff..bcaa63d1955f 100644
--- a/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
+++ b/drivers/gpu/drm/panel/panel-asus-z00t-tm5p5-n35596.c
@@ -16,7 +16,6 @@ struct tm5p5_nt35596 {
 	struct mipi_dsi_device *dsi;
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
-	bool prepared;
 };
 
 static inline struct tm5p5_nt35596 *to_tm5p5_nt35596(struct drm_panel *panel)
@@ -112,9 +111,6 @@ static int tm5p5_nt35596_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
@@ -132,7 +128,6 @@ static int tm5p5_nt35596_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -142,9 +137,6 @@ static int tm5p5_nt35596_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = tm5p5_nt35596_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -153,7 +145,6 @@ static int tm5p5_nt35596_unprepare(struct drm_panel *panel)
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
 			       ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c b/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c
index 90098b753e3b..e77db8597eb7 100644
--- a/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c
+++ b/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c
@@ -34,7 +34,6 @@ struct boe_bf060y8m_aj0 {
 	struct mipi_dsi_device *dsi;
 	struct regulator_bulk_data vregs[BF060Y8M_VREG_MAX];
 	struct gpio_desc *reset_gpio;
-	bool prepared;
 };
 
 static inline
@@ -129,9 +128,6 @@ static int boe_bf060y8m_aj0_prepare(struct drm_panel *panel)
 	struct device *dev = &boe->dsi->dev;
 	int ret;
 
-	if (boe->prepared)
-		return 0;
-
 	/*
 	 * Enable EL Driving Voltage first - doing that at the beginning
 	 * or at the end of the power sequence doesn't matter, so enable
@@ -166,7 +162,6 @@ static int boe_bf060y8m_aj0_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	boe->prepared = true;
 	return 0;
 
 err_vci:
@@ -186,9 +181,6 @@ static int boe_bf060y8m_aj0_unprepare(struct drm_panel *panel)
 	struct device *dev = &boe->dsi->dev;
 	int ret;
 
-	if (!boe->prepared)
-		return 0;
-
 	ret = boe_bf060y8m_aj0_off(boe);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -196,7 +188,6 @@ static int boe_bf060y8m_aj0_unprepare(struct drm_panel *panel)
 	gpiod_set_value_cansleep(boe->reset_gpio, 1);
 	ret = regulator_bulk_disable(ARRAY_SIZE(boe->vregs), boe->vregs);
 
-	boe->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
index 8912757a6f42..3e0a8e0d58a0 100644
--- a/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
+++ b/drivers/gpu/drm/panel/panel-jdi-fhd-r63452.c
@@ -21,7 +21,6 @@ struct jdi_fhd_r63452 {
 	struct drm_panel panel;
 	struct mipi_dsi_device *dsi;
 	struct gpio_desc *reset_gpio;
-	bool prepared;
 };
 
 static inline struct jdi_fhd_r63452 *to_jdi_fhd_r63452(struct drm_panel *panel)
@@ -157,9 +156,6 @@ static int jdi_fhd_r63452_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	jdi_fhd_r63452_reset(ctx);
 
 	ret = jdi_fhd_r63452_on(ctx);
@@ -169,7 +165,6 @@ static int jdi_fhd_r63452_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -179,16 +174,12 @@ static int jdi_fhd_r63452_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = jdi_fhd_r63452_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
 
 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index 412ca84d0581..648ce9201426 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -59,7 +59,6 @@ struct nt35950 {
 
 	int cur_mode;
 	u8 last_page;
-	bool prepared;
 };
 
 struct nt35950_panel_mode {
@@ -431,9 +430,6 @@ static int nt35950_prepare(struct drm_panel *panel)
 	struct device *dev = &nt->dsi[0]->dev;
 	int ret;
 
-	if (nt->prepared)
-		return 0;
-
 	ret = regulator_enable(nt->vregs[0].consumer);
 	if (ret)
 		return ret;
@@ -460,7 +456,6 @@ static int nt35950_prepare(struct drm_panel *panel)
 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
 		goto end;
 	}
-	nt->prepared = true;
 
 end:
 	if (ret < 0) {
@@ -477,9 +472,6 @@ static int nt35950_unprepare(struct drm_panel *panel)
 	struct device *dev = &nt->dsi[0]->dev;
 	int ret;
 
-	if (!nt->prepared)
-		return 0;
-
 	ret = nt35950_off(nt);
 	if (ret < 0)
 		dev_err(dev, "Failed to deinitialize panel: %d\n", ret);
@@ -487,7 +479,6 @@ static int nt35950_unprepare(struct drm_panel *panel)
 	gpiod_set_value_cansleep(nt->reset_gpio, 0);
 	regulator_bulk_disable(ARRAY_SIZE(nt->vregs), nt->vregs);
 
-	nt->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt36523.c b/drivers/gpu/drm/panel/panel-novatek-nt36523.c
index 9632b9e95b71..9b9a7eb1bc60 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt36523.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt36523.c
@@ -38,8 +38,6 @@ struct panel_info {
 	struct gpio_desc *reset_gpio;
 	struct backlight_device *backlight;
 	struct regulator *vddio;
-
-	bool prepared;
 };
 
 struct panel_desc {
@@ -1046,9 +1044,6 @@ static int nt36523_prepare(struct drm_panel *panel)
 	struct panel_info *pinfo = to_panel_info(panel);
 	int ret;
 
-	if (pinfo->prepared)
-		return 0;
-
 	ret = regulator_enable(pinfo->vddio);
 	if (ret) {
 		dev_err(panel->dev, "failed to enable vddio regulator: %d\n", ret);
@@ -1064,8 +1059,6 @@ static int nt36523_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	pinfo->prepared = true;
-
 	return 0;
 }
 
@@ -1095,14 +1088,9 @@ static int nt36523_unprepare(struct drm_panel *panel)
 {
 	struct panel_info *pinfo = to_panel_info(panel);
 
-	if (!pinfo->prepared)
-		return 0;
-
 	gpiod_set_value_cansleep(pinfo->reset_gpio, 1);
 	regulator_disable(pinfo->vddio);
 
-	pinfo->prepared = false;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-raydium-rm68200.c b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
index 5f9b340588fb..7b7fe987e292 100644
--- a/drivers/gpu/drm/panel/panel-raydium-rm68200.c
+++ b/drivers/gpu/drm/panel/panel-raydium-rm68200.c
@@ -77,8 +77,6 @@ struct rm68200 {
 	struct drm_panel panel;
 	struct gpio_desc *reset_gpio;
 	struct regulator *supply;
-	bool prepared;
-	bool enabled;
 };
 
 static const struct drm_display_mode default_mode = {
@@ -231,27 +229,12 @@ static void rm68200_init_sequence(struct rm68200 *ctx)
 	dcs_write_seq(ctx, MCS_CMD_MODE_SW, MCS_CMD1_UCS);
 }
 
-static int rm68200_disable(struct drm_panel *panel)
-{
-	struct rm68200 *ctx = panel_to_rm68200(panel);
-
-	if (!ctx->enabled)
-		return 0;
-
-	ctx->enabled = false;
-
-	return 0;
-}
-
 static int rm68200_unprepare(struct drm_panel *panel)
 {
 	struct rm68200 *ctx = panel_to_rm68200(panel);
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = mipi_dsi_dcs_set_display_off(dsi);
 	if (ret)
 		dev_warn(panel->dev, "failed to set display off: %d\n", ret);
@@ -269,8 +252,6 @@ static int rm68200_unprepare(struct drm_panel *panel)
 
 	regulator_disable(ctx->supply);
 
-	ctx->prepared = false;
-
 	return 0;
 }
 
@@ -280,9 +261,6 @@ static int rm68200_prepare(struct drm_panel *panel)
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_enable(ctx->supply);
 	if (ret < 0) {
 		dev_err(ctx->dev, "failed to enable supply: %d\n", ret);
@@ -310,20 +288,6 @@ static int rm68200_prepare(struct drm_panel *panel)
 
 	msleep(20);
 
-	ctx->prepared = true;
-
-	return 0;
-}
-
-static int rm68200_enable(struct drm_panel *panel)
-{
-	struct rm68200 *ctx = panel_to_rm68200(panel);
-
-	if (ctx->enabled)
-		return 0;
-
-	ctx->enabled = true;
-
 	return 0;
 }
 
@@ -352,10 +316,8 @@ static int rm68200_get_modes(struct drm_panel *panel,
 }
 
 static const struct drm_panel_funcs rm68200_drm_funcs = {
-	.disable = rm68200_disable,
 	.unprepare = rm68200_unprepare,
 	.prepare = rm68200_prepare,
-	.enable = rm68200_enable,
 	.get_modes = rm68200_get_modes,
 };
 
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
index 7431cae7427e..d2df227abbea 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
@@ -18,8 +18,6 @@ struct s6e88a0_ams452ef01 {
 	struct mipi_dsi_device *dsi;
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
-
-	bool prepared;
 };
 
 static inline struct
@@ -115,9 +113,6 @@ static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
@@ -135,7 +130,6 @@ static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -145,9 +139,6 @@ static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = s6e88a0_ams452ef01_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -155,7 +146,6 @@ static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
index cbf9607dd576..04ce925b3d9d 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 regulator *supply;
 	struct gpio_desc *reset_gpio;
 	const struct drm_display_mode *mode;
-	bool prepared;
 };
 
 static inline
@@ -113,9 +112,6 @@ static int sofef00_panel_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_enable(ctx->supply);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulator: %d\n", ret);
@@ -131,7 +127,6 @@ static int sofef00_panel_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -141,16 +136,12 @@ static int sofef00_panel_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = sofef00_panel_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
 
 	regulator_disable(ctx->supply);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls060t1sx01.c b/drivers/gpu/drm/panel/panel-sharp-ls060t1sx01.c
index 68f52eaaf4fa..74c760ee0c2d 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls060t1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls060t1sx01.c
@@ -24,7 +24,6 @@ struct sharp_ls060 {
 	struct regulator *avdd_supply;
 	struct regulator *avee_supply;
 	struct gpio_desc *reset_gpio;
-	bool prepared;
 };
 
 static inline struct sharp_ls060 *to_sharp_ls060(struct drm_panel *panel)
@@ -101,9 +100,6 @@ static int sharp_ls060_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_enable(ctx->vddi_supply);
 	if (ret < 0)
 		return ret;
@@ -134,8 +130,6 @@ static int sharp_ls060_prepare(struct drm_panel *panel)
 		goto err_on;
 	}
 
-	ctx->prepared = true;
-
 	return 0;
 
 err_on:
@@ -163,9 +157,6 @@ static int sharp_ls060_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = sharp_ls060_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -181,7 +172,6 @@ static int sharp_ls060_unprepare(struct drm_panel *panel)
 
 	regulator_disable(ctx->vddi_supply);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c b/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
index 1bde2f01786b..472195d4bbbe 100644
--- a/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
+++ b/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
@@ -36,7 +36,6 @@ struct sony_td4353_jdi {
 	struct regulator_bulk_data supplies[3];
 	struct gpio_desc *panel_reset_gpio;
 	struct gpio_desc *touch_reset_gpio;
-	bool prepared;
 	int type;
 };
 
@@ -150,9 +149,6 @@ static int sony_td4353_jdi_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
@@ -171,7 +167,6 @@ static int sony_td4353_jdi_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -181,9 +176,6 @@ static int sony_td4353_jdi_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = sony_td4353_jdi_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to power off panel: %d\n", ret);
@@ -191,7 +183,6 @@ static int sony_td4353_jdi_unprepare(struct drm_panel *panel)
 	sony_td4353_assert_reset_gpios(ctx, 0);
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-sony-tulip-truly-nt35521.c b/drivers/gpu/drm/panel/panel-sony-tulip-truly-nt35521.c
index ee5d20ecc577..6d44970dccd9 100644
--- a/drivers/gpu/drm/panel/panel-sony-tulip-truly-nt35521.c
+++ b/drivers/gpu/drm/panel/panel-sony-tulip-truly-nt35521.c
@@ -23,8 +23,6 @@ struct truly_nt35521 {
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
 	struct gpio_desc *blen_gpio;
-	bool prepared;
-	bool enabled;
 };
 
 static inline
@@ -296,9 +294,6 @@ static int truly_nt35521_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
@@ -314,7 +309,6 @@ static int truly_nt35521_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -324,9 +318,6 @@ static int truly_nt35521_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = truly_nt35521_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -335,7 +326,6 @@ static int truly_nt35521_unprepare(struct drm_panel *panel)
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
 			       ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
@@ -343,12 +333,8 @@ static int truly_nt35521_enable(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
 
-	if (ctx->enabled)
-		return 0;
-
 	gpiod_set_value_cansleep(ctx->blen_gpio, 1);
 
-	ctx->enabled = true;
 	return 0;
 }
 
@@ -356,12 +342,8 @@ static int truly_nt35521_disable(struct drm_panel *panel)
 {
 	struct truly_nt35521 *ctx = to_truly_nt35521(panel);
 
-	if (!ctx->enabled)
-		return 0;
-
 	gpiod_set_value_cansleep(ctx->blen_gpio, 0);
 
-	ctx->enabled = false;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c b/drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c
index 6e77a2d71d81..0156689f41cd 100644
--- a/drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c
+++ b/drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c
@@ -35,7 +35,6 @@ enum {
 };
 
 struct stk_panel {
-	bool prepared;
 	const struct drm_display_mode *mode;
 	struct backlight_device *backlight;
 	struct drm_panel base;
@@ -145,16 +144,11 @@ static int stk_panel_unprepare(struct drm_panel *panel)
 {
 	struct stk_panel *stk = to_stk_panel(panel);
 
-	if (!stk->prepared)
-		return 0;
-
 	stk_panel_off(stk);
 	regulator_bulk_disable(ARRAY_SIZE(stk->supplies), stk->supplies);
 	gpiod_set_value(stk->reset_gpio, 0);
 	gpiod_set_value(stk->enable_gpio, 1);
 
-	stk->prepared = false;
-
 	return 0;
 }
 
@@ -164,9 +158,6 @@ static int stk_panel_prepare(struct drm_panel *panel)
 	struct device *dev = &stk->dsi->dev;
 	int ret;
 
-	if (stk->prepared)
-		return 0;
-
 	gpiod_set_value(stk->reset_gpio, 0);
 	gpiod_set_value(stk->enable_gpio, 0);
 	ret = regulator_enable(stk->supplies[IOVCC].consumer);
@@ -195,8 +186,6 @@ static int stk_panel_prepare(struct drm_panel *panel)
 		goto poweroff;
 	}
 
-	stk->prepared = true;
-
 	return 0;
 
 poweroff:
diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
index 4f4009f9fe25..b73448cf349d 100644
--- a/drivers/gpu/drm/panel/panel-truly-nt35597.c
+++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
@@ -64,8 +64,6 @@ struct truly_nt35597 {
 	struct mipi_dsi_device *dsi[2];
 
 	const struct nt35597_config *config;
-	bool prepared;
-	bool enabled;
 };
 
 static inline struct truly_nt35597 *panel_to_ctx(struct drm_panel *panel)
@@ -313,16 +311,12 @@ static int truly_nt35597_disable(struct drm_panel *panel)
 	struct truly_nt35597 *ctx = panel_to_ctx(panel);
 	int ret;
 
-	if (!ctx->enabled)
-		return 0;
-
 	if (ctx->backlight) {
 		ret = backlight_disable(ctx->backlight);
 		if (ret < 0)
 			dev_err(ctx->dev, "backlight disable failed %d\n", ret);
 	}
 
-	ctx->enabled = false;
 	return 0;
 }
 
@@ -331,9 +325,6 @@ static int truly_nt35597_unprepare(struct drm_panel *panel)
 	struct truly_nt35597 *ctx = panel_to_ctx(panel);
 	int ret = 0;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ctx->dsi[0]->mode_flags = 0;
 	ctx->dsi[1]->mode_flags = 0;
 
@@ -354,7 +345,6 @@ static int truly_nt35597_unprepare(struct drm_panel *panel)
 	if (ret < 0)
 		dev_err(ctx->dev, "power_off failed ret = %d\n", ret);
 
-	ctx->prepared = false;
 	return ret;
 }
 
@@ -367,9 +357,6 @@ static int truly_nt35597_prepare(struct drm_panel *panel)
 	const struct nt35597_config *config;
 	u32 num_cmds;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = truly_35597_power_on(ctx);
 	if (ret < 0)
 		return ret;
@@ -409,8 +396,6 @@ static int truly_nt35597_prepare(struct drm_panel *panel)
 	/* Per DSI spec wait 120ms after sending set_display_on DCS command */
 	msleep(120);
 
-	ctx->prepared = true;
-
 	return 0;
 
 power_off:
@@ -424,17 +409,12 @@ static int truly_nt35597_enable(struct drm_panel *panel)
 	struct truly_nt35597 *ctx = panel_to_ctx(panel);
 	int ret;
 
-	if (ctx->enabled)
-		return 0;
-
 	if (ctx->backlight) {
 		ret = backlight_enable(ctx->backlight);
 		if (ret < 0)
 			dev_err(ctx->dev, "backlight enable failed %d\n", ret);
 	}
 
-	ctx->enabled = true;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/panel/panel-visionox-r66451.c b/drivers/gpu/drm/panel/panel-visionox-r66451.c
index 00fc28ad3d07..fbb73464de33 100644
--- a/drivers/gpu/drm/panel/panel-visionox-r66451.c
+++ b/drivers/gpu/drm/panel/panel-visionox-r66451.c
@@ -22,7 +22,6 @@ struct visionox_r66451 {
 	struct mipi_dsi_device *dsi;
 	struct gpio_desc *reset_gpio;
 	struct regulator_bulk_data supplies[2];
-	bool prepared, enabled;
 };
 
 static inline struct visionox_r66451 *to_visionox_r66451(struct drm_panel *panel)
@@ -124,9 +123,6 @@ static int visionox_r66451_prepare(struct drm_panel *panel)
 	struct device *dev = &dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
 				    ctx->supplies);
 	if (ret < 0)
@@ -144,7 +140,6 @@ static int visionox_r66451_prepare(struct drm_panel *panel)
 
 	mipi_dsi_compression_mode(ctx->dsi, true);
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -154,9 +149,6 @@ static int visionox_r66451_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = visionox_r66451_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -164,7 +156,6 @@ static int visionox_r66451_unprepare(struct drm_panel *panel)
 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
@@ -190,9 +181,6 @@ static int visionox_r66451_enable(struct drm_panel *panel)
 	struct drm_dsc_picture_parameter_set pps;
 	int ret;
 
-	if (ctx->enabled)
-		return 0;
-
 	if (!dsi->dsc) {
 		dev_err(&dsi->dev, "DSC not attached to DSI\n");
 		return -ENODEV;
@@ -219,8 +207,6 @@ static int visionox_r66451_enable(struct drm_panel *panel)
 	}
 	msleep(20);
 
-	ctx->enabled = true;
-
 	return 0;
 }
 
@@ -231,8 +217,6 @@ static int visionox_r66451_disable(struct drm_panel *panel)
 	struct device *dev = &dsi->dev;
 	int ret;
 
-	ctx->enabled = false;
-
 	ret = mipi_dsi_dcs_set_display_off(dsi);
 	if (ret < 0) {
 		dev_err(dev, "Failed to set display off: %d\n", ret);
diff --git a/drivers/gpu/drm/panel/panel-visionox-rm69299.c b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
index c2806e4fd553..775144695283 100644
--- a/drivers/gpu/drm/panel/panel-visionox-rm69299.c
+++ b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
@@ -20,8 +20,6 @@ struct visionox_rm69299 {
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
 	struct mipi_dsi_device *dsi;
-	bool prepared;
-	bool enabled;
 };
 
 static inline struct visionox_rm69299 *panel_to_ctx(struct drm_panel *panel)
@@ -80,7 +78,6 @@ static int visionox_rm69299_unprepare(struct drm_panel *panel)
 
 	ret = visionox_rm69299_power_off(ctx);
 
-	ctx->prepared = false;
 	return ret;
 }
 
@@ -89,9 +86,6 @@ static int visionox_rm69299_prepare(struct drm_panel *panel)
 	struct visionox_rm69299 *ctx = panel_to_ctx(panel);
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = visionox_rm69299_power_on(ctx);
 	if (ret < 0)
 		return ret;
@@ -140,8 +134,6 @@ static int visionox_rm69299_prepare(struct drm_panel *panel)
 	/* Per DSI spec wait 120ms after sending set_display_on DCS command */
 	msleep(120);
 
-	ctx->prepared = true;
-
 	return 0;
 
 power_off:
diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
index bb0dfd86ea67..a23407b9f6fb 100644
--- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
+++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
@@ -20,7 +20,6 @@ struct visionox_vtdr6130 {
 	struct mipi_dsi_device *dsi;
 	struct gpio_desc *reset_gpio;
 	struct regulator_bulk_data supplies[3];
-	bool prepared;
 };
 
 static inline struct visionox_vtdr6130 *to_visionox_vtdr6130(struct drm_panel *panel)
@@ -157,9 +156,6 @@ static int visionox_vtdr6130_prepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
 				    ctx->supplies);
 	if (ret < 0)
@@ -175,7 +171,6 @@ static int visionox_vtdr6130_prepare(struct drm_panel *panel)
 		return ret;
 	}
 
-	ctx->prepared = true;
 	return 0;
 }
 
@@ -185,9 +180,6 @@ static int visionox_vtdr6130_unprepare(struct drm_panel *panel)
 	struct device *dev = &ctx->dsi->dev;
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = visionox_vtdr6130_off(ctx);
 	if (ret < 0)
 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
@@ -196,7 +188,6 @@ static int visionox_vtdr6130_unprepare(struct drm_panel *panel)
 
 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 
-	ctx->prepared = false;
 	return 0;
 }
 
-- 
2.41.0.585.gd2178a4bd4-goog