linux-kernel - [PATCH v8 03/10] drm/sun4i: sun6i_mipi

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Date:   Fri, 15 Feb 2019 01:02:30 +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 03/10] drm/sun4i: sun6i_mipi_dsi: Setup burst mode timings

Burst mode display timings are different from conventional video mode.

For burst mode most of the timings hsa, hbp, hfp, vblk are 0 and hblk
is computed as (mode->hdisplay * Bpp)

This patch simply add burst mode timings without touching existing mode
timings.

Reference code taken from BSP (from linux-sunxi/
drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)

dsi_hsa  = 0;
dsi_hbp  = 0;
dsi_hact = x*dsi_pixel_bits[format]/8;
dsi_hblk = dsi_hact;
dsi_hfp  = 0;
dsi_vblk = 0;

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@...zup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 1a0707468121..4362d9df1da6 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -516,6 +516,12 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 
 	/* Do all timing calculations up front to allocate buffer space */
 
+	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+		hbp = hfp = hsa = vblk = 0;
+		hblk = (mode->hdisplay * Bpp);
+		goto alloc_buf;
+	}
+
 	/*
 	 * A sync period is composed of a blanking packet (4 bytes +
 	 * payload + 2 bytes) and a sync event packet (4 bytes). Its
@@ -554,6 +560,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 
 	vblk = sun6i_dsi_get_timings_vblk(dsi, mode, hblk);
 
+alloc_buf:
 	/* How many bytes do we need to send all payloads? */
 	bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
 	buffer = kmalloc(bytes, GFP_KERNEL);
-- 
2.18.0.321.gffc6fa0e3