linux-kernel - [PATCH v8 09/10] drm/sun4i: sun6i_mipi_dsi: Enable trail_inv and trail

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Date:   Fri, 15 Feb 2019 01:02:36 +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 09/10] drm/sun4i: sun6i_mipi_dsi: Enable trail_inv and trail_fill controls

The burst mode panels with 4-lane would require to enable trail bits
in DSI basic control register.

So, enable 2byte trail and trail_env for 4-lane burst mode devices.

Allwinner A64 BSP should also relie on same setup for enabling trail
bit in DSI controller.

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

if (panel->lcd_dsi_lane == 4)
{
   dsi_dev[sel]->dsi_basic_ctl.bits.trail_inv = 0xc;
   dsi_dev[sel]->dsi_basic_ctl.bits.trail_fill     = 1;
}

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@...zup.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 63b83b47cf0d..ec9424b6da9e 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -34,6 +34,8 @@
 #define SUN6I_DSI_CTL_EN			BIT(0)
 
 #define SUN6I_DSI_BASIC_CTL_REG		0x00c
+#define SUN6I_DSI_BASIC_CTL_TRAIL_INV(n)	(((n) & 0xf) << 4)
+#define SUN6I_DSI_BASIC_CTL_TRAIL_FILL		BIT(3)
 #define SUN6I_DSI_BASIC_CTL_HBP_DIS		BIT(2)
 #define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS		BIT(1)
 #define SUN6I_DSI_BASIC_CTL_VIDEO_BURST		BIT(0)
@@ -482,6 +484,10 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 	/* enable burst mode */
 	regmap_read(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, &val);
 	val |= SUN6I_DSI_BASIC_CTL_VIDEO_BURST;
+	if (device->lanes == 4) {
+		val |= SUN6I_DSI_BASIC_CTL_TRAIL_INV(0xc);
+		val |= SUN6I_DSI_BASIC_CTL_TRAIL_FILL;
+	}
 	regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, val);
 }
 
-- 
2.18.0.321.gffc6fa0e3