linux-kernel - [PATCH v4 2/2] drm/panel: boe-tv101wum-nl6: Fine tune the panel power sequence

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Message-ID: <20230515094955.15982-3-shuijing.li@mediatek.com>
Date:   Mon, 15 May 2023 17:49:55 +0800
From:   Shuijing Li <shuijing.li@...iatek.com>
To:     <neil.armstrong@...aro.org>, <sam@...nborg.org>,
        <airlied@...il.com>, <daniel@...ll.ch>, <matthias.bgg@...il.com>,
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <jitao.shi@...iatek.com>, Shuijing Li <shuijing.li@...iatek.com>,
        Xinlei Lee <xinlei.lee@...iatek.com>
Subject: [PATCH v4 2/2] drm/panel: boe-tv101wum-nl6: Fine tune the panel power sequence

For "boe,tv105wum-nw0" this special panel, it is stipulated in
the panel spec that MIPI needs to keep the LP11 state before
the lcm_reset pin is pulled high.

Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index a5652d38acda..64e462f49c60 100644
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -36,6 +36,7 @@ struct panel_desc {
 	const struct panel_init_cmd *init_cmds;
 	unsigned int lanes;
 	bool discharge_on_disable;
+	bool lp11_before_reset;
 };
 
 struct boe_panel {
@@ -1365,6 +1366,10 @@ static int boe_panel_prepare(struct drm_panel *panel)
 
 	usleep_range(10000, 11000);
 
+	if (boe->desc->lp11_before_reset) {
+		mipi_dsi_dcs_nop(boe->dsi);
+		usleep_range(1000, 2000);
+	}
 	gpiod_set_value(boe->enable_gpio, 1);
 	usleep_range(1000, 2000);
 	gpiod_set_value(boe->enable_gpio, 0);
@@ -1591,6 +1596,7 @@ static const struct panel_desc boe_tv105wum_nw0_desc = {
 	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 		      MIPI_DSI_MODE_LPM,
 	.init_cmds = boe_init_cmd,
+	.lp11_before_reset = true,
 };
 
 static const struct drm_display_mode starry_qfh032011_53g_default_mode = {
-- 
2.40.1