[PATCH] drm: bridge: samsung-dsim: Add i.MX8M Plus support
Marcel Ziswiler
marcel.ziswiler at toradex.com
Tue Nov 1 17:01:18 PDT 2022
Hi Marek
On Sun, 2022-10-16 at 00:07 +0200, Marek Vasut wrote:
> 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>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
I also tried to test it on Verdin iMX8M Plus but so far I was unable to make it work. Either I am still missing
some other pieces or I got the imx8mp.dtsi parts wrong. Do you have them available somewhere by any chance?
Thanks!
Cheers
Marcel
> ---
> 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,
> };
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