[PATCH] drm: bridge: samsung-dsim: Add i.MX8M Plus support
Marek Vasut
marex at denx.de
Sat Oct 15 22:07:53 UTC 2022
Add extras to support i.MX8M Plus. The main change is the removal of
HS/VS/DE signal inversion in the LCDIFv3-DSIM glue logic, otherwise
the implementation of this IP in i.MX8M Plus is very much compatible
with the i.MX8M Mini/Nano one.
Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Adam Ford <aford173 at gmail.com>
Cc: Andrzej Hajda <andrzej.hajda at intel.com>
Cc: Frieder Schrempf <frieder.schrempf at kontron.de>
Cc: Inki Dae <inki.dae at samsung.com>
Cc: Jagan Teki <jagan at amarulasolutions.com>
Cc: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Cc: Matteo Lisi <matteo.lisi at engicam.com>
Cc: Michael Nazzareno Trimarchi <michael at amarulasolutions.com>
Cc: NXP Linux Team <linux-imx at nxp.com>
Cc: Robert Foss <robert.foss at linaro.org>
Cc: Seung-Woo Kim <sw0312.kim at samsung.com>
Cc: Tim Harvey <tharvey at gateworks.com>
Cc: Tommaso Merciai <tommaso.merciai at amarulasolutions.com>
Cc: linux-amarula <linux-amarula at amarulasolutions.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
To: dri-devel at lists.freedesktop.org
---
drivers/gpu/drm/bridge/samsung-dsim.c | 55 +++++++++++++++++++++------
include/drm/bridge/samsung-dsim.h | 1 +
2 files changed, 44 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 012d8b6463ad6..cf40fd8813ff2 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -465,6 +465,7 @@ samsung_dsim_types[SAMSUNG_DSIM_TYPE_COUNT] = {
[SAMSUNG_DSIM_TYPE_EXYNOS5422] = &exynos5422_dsi_driver_data,
[SAMSUNG_DSIM_TYPE_EXYNOS5433] = &exynos5433_dsi_driver_data,
[SAMSUNG_DSIM_TYPE_IMX8MM] = &imx8mm_dsi_driver_data,
+ [SAMSUNG_DSIM_TYPE_IMX8MP] = &imx8mm_dsi_driver_data,
};
static inline struct samsung_dsim *host_to_dsi(struct mipi_dsi_host *h)
@@ -1404,18 +1405,26 @@ static int samsung_dsim_atomic_check(struct drm_bridge *bridge,
struct samsung_dsim *dsi = bridge_to_dsi(bridge);
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+ /*
+ * The i.MX8M Mini/Nano glue logic between LCDIF and DSIM
+ * inverts HS/VS/DE sync signals polarity, therefore, while
+ * i.MX 8M Mini Applications Processor Reference Manual Rev. 3, 11/2020
+ * 13.6.3.5.2 RGB interface
+ * i.MX 8M Nano Applications Processor Reference Manual Rev. 2, 07/2022
+ * 13.6.2.7.2 RGB interface
+ * both claim "Vsync, Hsync, and VDEN are active high signals.", the
+ * LCDIF must generate inverted HS/VS/DE signals, i.e. active LOW.
+ *
+ * The i.MX8M Plus glue logic between LCDIFv3 and DSIM does not
+ * implement the same behavior, therefore LCDIFv3 must generate
+ * HS/VS/DE signals active HIGH.
+ */
if (dsi->plat_data->hw_type == SAMSUNG_DSIM_TYPE_IMX8MM) {
- /**
- * FIXME:
- * At least LCDIF + DSIM needs active low sync,
- * but i.MX 8M Mini Applications Processor Reference Manual,
- * Rev. 3, 11/2020 says
- *
- * 13.6.3.5.2 RGB interface
- * Vsync, Hsync, and VDEN are active high signals.
- */
adjusted_mode->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
adjusted_mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+ } else if (dsi->plat_data->hw_type == SAMSUNG_DSIM_TYPE_IMX8MP) {
+ adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+ adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
}
return 0;
@@ -1448,7 +1457,8 @@ static int samsung_dsim_attach(struct drm_bridge *bridge,
* Passing NULL to the previous bridge makes Exynos DSI drivers
* work which is exactly done before.
*/
- if (!(dsi->plat_data->hw_type == SAMSUNG_DSIM_TYPE_IMX8MM))
+ if (dsi->plat_data->hw_type != SAMSUNG_DSIM_TYPE_IMX8MM &&
+ dsi->plat_data->hw_type != SAMSUNG_DSIM_TYPE_IMX8MP)
previous = NULL;
return drm_bridge_attach(bridge->encoder, dsi->out_bridge, previous,
@@ -1649,7 +1659,11 @@ static const struct samsung_dsim_host_ops samsung_dsim_generic_host_ops = {
.unregister_host = samsung_dsim_unregister_host,
};
-static const struct drm_bridge_timings samsung_dsim_bridge_timings = {
+static const struct drm_bridge_timings samsung_dsim_bridge_timings_de_high = {
+ .input_bus_flags = DRM_BUS_FLAG_DE_HIGH,
+};
+
+static const struct drm_bridge_timings samsung_dsim_bridge_timings_de_low = {
.input_bus_flags = DRM_BUS_FLAG_DE_LOW,
};
@@ -1733,9 +1747,17 @@ int samsung_dsim_probe(struct platform_device *pdev)
dsi->bridge.funcs = &samsung_dsim_bridge_funcs;
dsi->bridge.of_node = dev->of_node;
- dsi->bridge.timings = &samsung_dsim_bridge_timings;
dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
+ /*
+ * The i.MX8M Mini/Nano LCDIF-DSIM glue logic inverts DE signal
+ * polarity, see comment in samsung_dsim_atomic_check().
+ */
+ if (dsi->plat_data->hw_type == SAMSUNG_DSIM_TYPE_IMX8MM)
+ dsi->bridge.timings = &samsung_dsim_bridge_timings_de_low;
+ else
+ dsi->bridge.timings = &samsung_dsim_bridge_timings_de_high;
+
if (dsi->plat_data->host_ops && dsi->plat_data->host_ops->register_host)
ret = dsi->plat_data->host_ops->register_host(dsi);
@@ -1841,11 +1863,20 @@ static const struct samsung_dsim_plat_data samsung_dsim_imx8mm_pdata = {
.host_ops = &samsung_dsim_generic_host_ops,
};
+static const struct samsung_dsim_plat_data samsung_dsim_imx8mp_pdata = {
+ .hw_type = SAMSUNG_DSIM_TYPE_IMX8MP,
+ .host_ops = &samsung_dsim_generic_host_ops,
+};
+
static const struct of_device_id samsung_dsim_of_match[] = {
{
.compatible = "fsl,imx8mm-mipi-dsim",
.data = &samsung_dsim_imx8mm_pdata,
},
+ {
+ .compatible = "fsl,imx8mp-mipi-dsim",
+ .data = &samsung_dsim_imx8mp_pdata,
+ },
{ /* sentinel. */ }
};
MODULE_DEVICE_TABLE(of, samsung_dsim_of_match);
diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h
index df3d030daec6a..3789f9dbb238b 100644
--- a/include/drm/bridge/samsung-dsim.h
+++ b/include/drm/bridge/samsung-dsim.h
@@ -28,6 +28,7 @@ enum samsung_dsim_type {
SAMSUNG_DSIM_TYPE_EXYNOS5422,
SAMSUNG_DSIM_TYPE_EXYNOS5433,
SAMSUNG_DSIM_TYPE_IMX8MM,
+ SAMSUNG_DSIM_TYPE_IMX8MP,
SAMSUNG_DSIM_TYPE_COUNT,
};
--
2.35.1
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