2021-11-06 14:19:23 +00:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Icenowy Zheng <icenowy@aosc.io>
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Date: Mon, 16 Mar 2020 21:35:02 +0800
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Subject: [PATCH] drm/sun4i: sun6i_mipi_dsi: fix horizontal timing calculation
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The max() function call in horizontal timing calculation shouldn't pad a
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length already subtracted with overhead to overhead, instead it should
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only prevent the set timing to underflow.
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Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
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---
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drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
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index aa67cb037e9d..52e009dc632b 100644
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--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
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+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
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@@ -556,7 +556,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
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*/
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#define HSA_PACKET_OVERHEAD 10
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2022-10-15 21:04:48 +00:00
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hsa = max(HSA_PACKET_OVERHEAD,
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2021-11-06 14:19:23 +00:00
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- (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
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+ (mode->hsync_end - mode->hsync_start) * Bpp) - HSA_PACKET_OVERHEAD;
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/*
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* The backporch is set using a blanking packet (4
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@@ -565,7 +565,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
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*/
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#define HBP_PACKET_OVERHEAD 6
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2022-10-15 21:04:48 +00:00
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hbp = max(HBP_PACKET_OVERHEAD,
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2021-11-06 14:19:23 +00:00
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- (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
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+ (mode->htotal - mode->hsync_end) * Bpp) - HBP_PACKET_OVERHEAD;
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/*
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* The frontporch is set using a sync event (4 bytes)
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@@ -575,7 +575,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
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*/
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#define HFP_PACKET_OVERHEAD 16
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2022-10-15 21:04:48 +00:00
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hfp = max(HFP_PACKET_OVERHEAD,
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2021-11-06 14:19:23 +00:00
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- (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
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+ (mode->hsync_start - mode->hdisplay) * Bpp) - HFP_PACKET_OVERHEAD;
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/*
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* The blanking is set using a sync event (4 bytes)
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@@ -584,8 +584,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
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*/
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#define HBLK_PACKET_OVERHEAD 10
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2022-10-15 21:04:48 +00:00
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hblk = max(HBLK_PACKET_OVERHEAD,
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2021-11-06 14:19:23 +00:00
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- (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp -
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- HBLK_PACKET_OVERHEAD);
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+ (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp) -
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+ HBLK_PACKET_OVERHEAD;
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/*
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* And I'm not entirely sure what vblk is about. The driver in
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--
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2.28.0
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