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