[PATCH v6 08/22] drm/sun4i: sun6i_mipi_dsi: Enable 2byte trail for 4-lane burst mode
From: Jagan Teki <jagan@amarulasolutions.com>
Date: 2019-01-24 20:00:07
Also in:
dri-devel, linux-clk, linux-devicetree, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm drivers for allwinner a10, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Chen-Yu Tsai, Linus Torvalds
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
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