| Message ID | 20221214125907.376148-11-jagan@amarulasolutions.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm: Add Samsung MIPI DSIM bridge | expand |
On 14.12.22 13:58, Jagan Teki wrote: > 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. > > Suggested-by: Marek Vasut <marex@denx.de> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c index 12a40576f937..36820a7b5884 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -1692,6 +1692,10 @@ 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; @@ -1778,6 +1782,10 @@ 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;
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. Suggested-by: Marek Vasut <marex@denx.de> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> --- Changes for v10, v9: - none Changes for v8: - add DE_LOW for i.MX8M Mini/Nano platforms. Changes for v7, v6: - none Changes for v5: - rebased based on updated bridge changes Changes for v4 - v1: - none drivers/gpu/drm/exynos/exynos_drm_dsi.c | 8 ++++++++ 1 file changed, 8 insertions(+)