diff mbox series

[v10,10/18] drm: exynos: dsi: Add input_bus_flags

Message ID 20221214125907.376148-11-jagan@amarulasolutions.com
State New
Headers
Series drm: Add Samsung MIPI DSIM bridge |

Commit Message

Jagan Teki Dec. 14, 2022, 12:58 p.m. UTC 
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(+)

Comments

Frieder Schrempf Dec. 15, 2022, 8:42 a.m. UTC | #1 
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 mbox series

Patch

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;