41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
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From 9fb5bef8ed96e433c9a9282f0c64e84bd8f5f206 Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megous@megous.com>
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Date: Tue, 23 Nov 2021 18:45:28 +0100
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Subject: [PATCH 476/478] drm: panel: st7703: Fix power off sequence
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After issuing SLEEP IN, it's necessary to let the controller complete
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the blanking sequence and drain the charge from the panel. (According
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to the datasheet.)
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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drivers/gpu/drm/panel/panel-sitronix-st7703.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
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index b463e4c5f238..af5f91ab997b 100644
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--- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
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+++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
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@@ -378,7 +378,7 @@ static int st7703_enable(struct drm_panel *panel)
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return ret;
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}
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- /* Dsiplay on can be issued 120 msec after sleep out */
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+ /* Display on can be issued 120 msec after sleep out */
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msleep(120);
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ret = mipi_dsi_dcs_set_display_on(dsi);
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@@ -404,6 +404,9 @@ static int st7703_disable(struct drm_panel *panel)
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if (ret < 0)
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dev_err(ctx->dev, "Failed to enter sleep mode: %d\n", ret);
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+ /* Display needs to be drained of charge, in order to work correctly on next power on. */
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+ msleep(120);
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+
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return 0;
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}
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--
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2.35.3
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