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drm/sun4i: dsi: fix the overhead of the horizontal front porch 

The formula in the BSP kernel indicates that a 16-byte overhead is used
when sending the HFP. However, this value is currently set to 6 in the
sun6i_mipi_dsi driver, which makes some panels flashing.

Fix this overhead value.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191006160303.24413-3-icenowy@aosc.io
This commit is contained in:
Icenowy Zheng 2019-10-07 00:03:01 +08:00 committed by Maxime Ripard
parent 10d8f308ba
commit 81fafb9488
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1 changed files with 5 additions and 4 deletions
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drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
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@ -569,11 +569,12 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
(mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
/*
* The frontporch is set using a blanking packet (4
* bytes + payload + 2 bytes). Its minimal size is
* therefore 6 bytes
* The frontporch is set using a sync event (4 bytes)
* and two blanking packets (each one is 4 bytes +
* payload + 2 bytes). Its minimal size is therefore
* 16 bytes
*/
#define HFP_PACKET_OVERHEAD 6
#define HFP_PACKET_OVERHEAD 16
hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
(mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);