drm: exynos: dsi: Add input_bus_flags

LCDIF-DSIM glue logic inverts the HS/VS/DE signals and expecting
the i.MX8M Mini/Nano DSI host to add additional Data Enable signal
active low (DE_LOW). This makes the valid data transfer on each
horizontal line.

So, add additional bus flags DE_LOW setting via input_bus_flags
for i.MX8M Mini/Nano platforms.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Suggested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index df4d95a..0c480be 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1736,6 +1736,10 @@ static const struct component_ops exynos_dsi_component_ops = {
        .unbind = exynos_dsi_unbind,
 };
 
+static const struct drm_bridge_timings dsim_bridge_timings_de_low = {
+       .input_bus_flags = DRM_BUS_FLAG_DE_LOW,
+};
+
 static int exynos_dsi_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -1822,6 +1826,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
        dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
        dsi->bridge.pre_enable_prev_first = true;
 
+       /* DE_LOW: i.MX8M Mini/Nano LCDIF-DSIM glue logic inverts HS/VS/DE */
+       if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MM)
+               dsi->bridge.timings = &dsim_bridge_timings_de_low;
+
        ret = component_add(dev, &exynos_dsi_component_ops);
        if (ret)
                goto err_disable_runtime;