From nobody Tue Feb 10 04:08:18 2026 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E65E333B962 for ; Tue, 13 Jan 2026 19:07:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768331261; cv=none; b=ZZITIS9buFzBxl7iMIkcnuV9QXo2HrY52nxdXgSA7FHFS5KK+xuOgVV+cnvwi2tEMkrkIehSyLCKU+cEey+27YixbtpExzYqTNhnGi7Dacl57wzi7N5O8BOC5JvFhr2P/gR+dGxJY7humI036eaK27z1gzdXMTT51H9EA45nvkw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768331261; c=relaxed/simple; bh=SUim/K0RxgKKDgS1rR0/FaYVWOujJK8XeCX1lOleGXs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=iVHbp0o/n4epml3d6jmup2l7ePCV1ATn5JjFhD/McNjIvx8MSqDiW12eWgjJh4Xoo1JiqDupDZQ9bHLyPEgmJNN76zuBamoBjwVKxZMP2Sa2enHvkdRFlwb3RnQo39haJzUfyJwSTBL5IbfS+FovE21C7bexDExzvyj+qK4CjsA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1vfjjn-0008Q2-PE; Tue, 13 Jan 2026 20:07:31 +0100 From: Marco Felsch Date: Tue, 13 Jan 2026 20:07:28 +0100 Subject: [PATCH v8 2/3] drm/bridge: imx: Add i.MX93 parallel display format configuration support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260113-v6-18-topic-imx93-parallel-display-v8-2-4abccdc473a5@pengutronix.de> References: <20260113-v6-18-topic-imx93-parallel-display-v8-0-4abccdc473a5@pengutronix.de> In-Reply-To: <20260113-v6-18-topic-imx93-parallel-display-v8-0-4abccdc473a5@pengutronix.de> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Peng Fan , Liu Ying , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel@pengutronix.de, Marco Felsch X-Mailer: b4 0.14.2 X-SA-Exim-Connect-IP: 2a0a:edc0:0:1101:1d::28 X-SA-Exim-Mail-From: m.felsch@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org From: Liu Ying NXP i.MX93 mediamix blk-ctrl contains one DISPLAY_MUX register which configures parallel display format by using the "PARALLEL_DISP_FORMAT" field. Add a DRM bridge driver to support the display format configuration. Signed-off-by: Liu Ying [m.felsch@pengutronix.de: port to v6.19-rc1] [m.felsch@pengutronix.de: add review feedback (Alexander)] [m.felsch@pengutronix.de: fix to short Kconfig description (checkpath)] [m.felsch@pengutronix.de: use "GPL" instead of "GPL v2" (checkpatch)] [m.felsch@pengutronix.de: add bus-width support] Signed-off-by: Marco Felsch --- drivers/gpu/drm/bridge/imx/Kconfig | 11 ++ drivers/gpu/drm/bridge/imx/Makefile | 1 + drivers/gpu/drm/bridge/imx/imx93-pdfc.c | 221 ++++++++++++++++++++++++++++= ++++ 3 files changed, 233 insertions(+) diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/im= x/Kconfig index b9028a5e5a065c3237b404111d8df57e8e017f9d..181ee87bc0f9f65ee0b6e5edbb4= 8ba808dfbb71f 100644 --- a/drivers/gpu/drm/bridge/imx/Kconfig +++ b/drivers/gpu/drm/bridge/imx/Kconfig @@ -99,4 +99,15 @@ config DRM_IMX93_MIPI_DSI Choose this to enable MIPI DSI controller found in Freescale i.MX93 processor. =20 +config DRM_IMX93_PARALLEL_DISP_FMT_CONFIG + tristate "NXP i.MX91/i.MX93 parallel display format configuration" + depends on OF + select DRM_KMS_HELPER + help + On i.MX93 and i.MX91 SoCs the parallel display format output is + controlled via the MEDIAMIX BLK-CTRL DISPLAY_MUX. + + Say 'Y' or 'M' if you use the parallel display output path on a + i.MX93 or i.MX91 SoC. + endif # ARCH_MXC || COMPILE_TEST diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/i= mx/Makefile index 8d01fda25451aaa1bf51a068da18948094327116..0ee768b8298915d0f81cd0be4cd= 3a75d674d9976 100644 --- a/drivers/gpu/drm/bridge/imx/Makefile +++ b/drivers/gpu/drm/bridge/imx/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) +=3D imx8qxp-pixel= -combiner.o obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) +=3D imx8qxp-pixel-link.o obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) +=3D imx8qxp-pxl2dpi.o obj-$(CONFIG_DRM_IMX93_MIPI_DSI) +=3D imx93-mipi-dsi.o +obj-$(CONFIG_DRM_IMX93_PARALLEL_DISP_FMT_CONFIG) +=3D imx93-pdfc.o diff --git a/drivers/gpu/drm/bridge/imx/imx93-pdfc.c b/drivers/gpu/drm/brid= ge/imx/imx93-pdfc.c new file mode 100644 index 0000000000000000000000000000000000000000..490eb3906201c8fa5d747846b75= bfc8e1f5f9189 --- /dev/null +++ b/drivers/gpu/drm/bridge/imx/imx93-pdfc.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * Copyright 2022-2025 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define IMX93_DISPLAY_MUX_REG 0x60 +#define PARALLEL_DISP_FORMAT GENMASK(10, 8) +#define FORMAT_RGB888_TO_RGB888 FIELD_PREP(PARALLEL_DISP_FORMAT, 0) +#define FORMAT_RGB888_TO_RGB666 FIELD_PREP(PARALLEL_DISP_FORMAT, 1) +#define FORMAT_RGB565_TO_RGB565 FIELD_PREP(PARALLEL_DISP_FORMAT, 2) + +struct imx93_pdfc { + struct drm_bridge bridge; + struct drm_bridge *next_bridge; + struct device *dev; + struct regmap *regmap; + u32 phy_bus_width; +}; + +static int +imx93_pdfc_bridge_attach(struct drm_bridge *bridge, struct drm_encoder *en= coder, + enum drm_bridge_attach_flags flags) +{ + struct imx93_pdfc *pdfc =3D bridge->driver_private; + + return drm_bridge_attach(bridge->encoder, pdfc->next_bridge, bridge, flag= s); +} + +static void imx93_pdfc_bridge_atomic_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct imx93_pdfc *pdfc =3D bridge->driver_private; + const struct drm_bridge_state *bridge_state; + unsigned int mask =3D PARALLEL_DISP_FORMAT; + unsigned int val; + + bridge_state =3D drm_atomic_get_new_bridge_state(state, bridge); + + switch (bridge_state->output_bus_cfg.format) { + case MEDIA_BUS_FMT_RGB888_1X24: + val =3D FORMAT_RGB888_TO_RGB888; + if (pdfc->phy_bus_width =3D=3D 18) { + /* + * Can be valid if physical bus limitation exists, + * therefore use dev_dbg(). + */ + dev_dbg(pdfc->dev, "Truncate two LSBs from each color\n"); + val =3D FORMAT_RGB888_TO_RGB666; + } + break; + case MEDIA_BUS_FMT_RGB666_1X18: + val =3D FORMAT_RGB888_TO_RGB666; + break; + case MEDIA_BUS_FMT_RGB565_1X16: + val =3D FORMAT_RGB565_TO_RGB565; + break; + } + + regmap_update_bits(pdfc->regmap, IMX93_DISPLAY_MUX_REG, mask, val); +} + +/* TODO: Add YUV formats */ +static const u32 imx93_pdfc_bus_output_fmts[] =3D { + MEDIA_BUS_FMT_RGB888_1X24, + MEDIA_BUS_FMT_RGB666_1X18, + MEDIA_BUS_FMT_RGB565_1X16, +}; + +static bool imx93_pdfc_bus_output_fmt_supported(const u32 fmt) +{ + int i; + + for (i =3D 0; i < ARRAY_SIZE(imx93_pdfc_bus_output_fmts); i++) { + if (imx93_pdfc_bus_output_fmts[i] =3D=3D fmt) + return true; + } + + return false; +} + +static u32 * +imx93_pdfc_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + u32 output_fmt, + unsigned int *num_input_fmts) +{ + struct imx93_pdfc *pdfc =3D bridge->driver_private; + u32 *input_fmts; + + *num_input_fmts =3D 0; + + input_fmts =3D kmalloc(sizeof(*input_fmts), GFP_KERNEL); + if (!input_fmts) + return NULL; + + *num_input_fmts =3D 1; + + if (!imx93_pdfc_bus_output_fmt_supported(output_fmt)) { + dev_dbg(pdfc->dev, "No valid output bus-fmt detected, fallback to MEDIA_= BUS_FMT_RGB888_1X24\n"); + input_fmts[0] =3D MEDIA_BUS_FMT_RGB888_1X24; + return input_fmts; + } + + switch (output_fmt) { + case MEDIA_BUS_FMT_RGB888_1X24: + case MEDIA_BUS_FMT_RGB565_1X16: + input_fmts[0] =3D output_fmt; + break; + case MEDIA_BUS_FMT_RGB666_1X18: + input_fmts[0] =3D MEDIA_BUS_FMT_RGB888_1X24; + break; + } + + return input_fmts; +} + +static int imx93_pdfc_bridge_atomic_check(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct imx93_pdfc *pdfc =3D bridge->driver_private; + const u32 format =3D bridge_state->output_bus_cfg.format; + + if (imx93_pdfc_bus_output_fmt_supported(format)) + return 0; + + dev_warn(pdfc->dev, "Unsupported output bus format: 0x%x\n", format); + + return -EINVAL; +} + +static const struct drm_bridge_funcs funcs =3D { + .attach =3D imx93_pdfc_bridge_attach, + .atomic_enable =3D imx93_pdfc_bridge_atomic_enable, + .atomic_duplicate_state =3D drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state =3D drm_atomic_helper_bridge_destroy_state, + .atomic_get_input_bus_fmts =3D imx93_pdfc_bridge_atomic_get_input_bus_fmt= s, + .atomic_check =3D imx93_pdfc_bridge_atomic_check, + .atomic_reset =3D drm_atomic_helper_bridge_reset, +}; + +static int imx93_pdfc_bridge_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct imx93_pdfc *pdfc; + struct device_node *ep; + int err; + + pdfc =3D devm_drm_bridge_alloc(dev, struct imx93_pdfc, bridge, &funcs); + if (IS_ERR(pdfc)) + return PTR_ERR(pdfc); + + pdfc->regmap =3D syscon_node_to_regmap(dev->of_node->parent); + if (IS_ERR(pdfc->regmap)) + return dev_err_probe(dev, PTR_ERR(pdfc->regmap), + "failed to get regmap\n"); + + /* No limits per default */ + pdfc->phy_bus_width =3D 24; + + /* Get output ep (port1/endpoint) */ + ep =3D of_graph_get_endpoint_by_regs(dev->of_node, 1, -1); + if (ep) { + err =3D of_property_read_u32(ep, "bus-width", &pdfc->phy_bus_width); + of_node_put(ep); + + /* bus-width is optional but it must have valid data if present */ + if (err && err !=3D -EINVAL) + return dev_err_probe(dev, err, + "failed to query bus-width\n"); + } + + pdfc->next_bridge =3D devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); + if (IS_ERR(pdfc->next_bridge)) + return dev_err_probe(dev, PTR_ERR(pdfc->next_bridge), + "failed to get next bridge\n"); + + pdfc->dev =3D dev; + pdfc->bridge.driver_private =3D pdfc; + pdfc->bridge.of_node =3D dev->of_node; + pdfc->bridge.type =3D DRM_MODE_CONNECTOR_DPI; + + return devm_drm_bridge_add(dev, &pdfc->bridge); +} + +static const struct of_device_id imx93_pdfc_dt_ids[] =3D { + { .compatible =3D "nxp,imx93-pdfc", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx93_pdfc_dt_ids); + +static struct platform_driver imx93_pdfc_bridge_driver =3D { + .probe =3D imx93_pdfc_bridge_probe, + .driver =3D { + .of_match_table =3D imx93_pdfc_dt_ids, + .name =3D "imx93_pdfc", + }, +}; +module_platform_driver(imx93_pdfc_bridge_driver); + +MODULE_DESCRIPTION("NXP i.MX93 parallel display format configuration drive= r"); +MODULE_AUTHOR("Liu Ying "); +MODULE_LICENSE("GPL"); --=20 2.47.3