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32 lines
1.2 KiB
Diff
32 lines
1.2 KiB
Diff
From 26be9df66c6aef500d73a74d7e99db029eca9ea2 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 11 Feb 2022 14:15:26 +0000
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Subject: [PATCH 733/828] drm/vc4: Remove entry to ULPS from vc4_dsi
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post_disable
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Post_disable was sending the D-PHY sequence to put any device
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into ULPS suspend mode, and then cutting power to the DSI block.
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The power-on reset state of the DSI block is for DSI to be in
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an operational state, not ULPS, so it then never sent the sequence
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for exiting ULPS. Any attached device that didn't have an external
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reset therefore remained in ULPS / standby, and didn't function.
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Use of ULPS isn't well specified in DRM, therefore remove entering
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it to avoid the above situation.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/vc4/vc4_dsi.c | 2 --
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1 file changed, 2 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_dsi.c
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+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
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@@ -816,8 +816,6 @@ static void vc4_dsi_bridge_post_disable(
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struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
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struct device *dev = &dsi->pdev->dev;
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- vc4_dsi_ulps(dsi, true);
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-
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clk_disable_unprepare(dsi->pll_phy_clock);
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clk_disable_unprepare(dsi->escape_clock);
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clk_disable_unprepare(dsi->pixel_clock);
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