linux-kernel - [PATCH v8 3/8] drm/sun4i: sun6i_mipi

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Date:   Fri, 15 Feb 2019 00:55:39 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-amarula@...rulasolutions.com,
        Michael Trimarchi <michael@...rulasolutions.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: [PATCH v8 3/8] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value

Current driver is calculating hfp maximum value by subtracting
htotal with hsync_end which is back porch value, but the hfp
refers to front porch.

Front porch value is calculating by subtracting hsync_start with
hdisplay as per drm_mode timings, and BSP code from BPI-M64-bsp
is eventually following the same.

BPI-M64-bsp is computing hfp as (from linux-sunxi/
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_hbp = (hbp-hspw)*dsi_pixel_bits[format]/8 - (4+2);
dsi_hact = x * dsi_pixel_bits[format]/8;
dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2);
dsi_hfp = dsi_hblk - (4+dsi_hact+2) - (4+dsi_hbp+2);

Example,
u32 fmt = dsi_pixel_bits[format]/8;
=> ((ht-hspw)*fmt - 10) - (6 + x * fmt) - (6 + (hbp-hspw)*fmt - 6)
=> (ht - hspw - x - (hbp - hspw)) * fmt - 16
=> (ht - x - hbp) * fmt - 16
=> (ht - x - (timmings->hor_total_time - timmings->hor_front_porch - x)
* fmt - 16
=> (timmings->hor_total_time - x - timmings->hor_total_time +
timmings->hor_front_porch + x) * fmt - 16
=> timmings->hor_front_porch * fmt - 16

So, update the hfp value accordingly in sun6i_dsi_setup_timings.

Tested on 2-lane, 4-lane MIPI-DSI LCD panels.

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@...zup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 982ae6b17654..21f39f11a8de 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -480,7 +480,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 	 */
 #define HFP_PACKET_OVERHEAD	6
 	hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-		  (mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
+		  (mode->hsync_start - mode->hdisplay) * Bpp -
+		  HFP_PACKET_OVERHEAD);
 
 	/*
 	 * hblk seems to be the line + porches length.
-- 
2.18.0.321.gffc6fa0e3