[PATCH v6 08/22] drm/sun4i: sun6i_mipi_dsi: Enable 2byte trail for 4-lane burst mode

Jagan Teki
2019-01-24T20:02:10Z

For 4-lane, burst mode panels would need to enable 2byte trail_fill
along with filling trail_env in dsi base control register.

Similar 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@amarulasolutions.com>
---
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 46ad142e66e8..a2ad9fa7f8d5 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -33,6 +33,8 @@
#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)
@@ -464,6 +466,10 @@ 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