From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 165E5CD4851 for ; Fri, 15 May 2026 09:10:07 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 23F2710F4A8; Fri, 15 May 2026 09:10:06 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="FjXxAIxY"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id BC34D10E00F for ; Fri, 15 May 2026 09:10:02 +0000 (UTC) Received: from [127.0.1.1] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 95A51DF3; Fri, 15 May 2026 11:09:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1778836192; bh=XXZPZjVwDE2HoX03g1ulcaBjlXV5Jlfo/sqTVaU8NOM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=FjXxAIxY+azS3Zie4XvYns4HkjbMIJHwiVwdw2DGNHSh7WIb5hQjTDoZdFI+Tx4xL 2nO4m9wTWTviJYRKq/m7ToDEM0TfavvQ3aCq/a3P2XhdsNmNLhvSHCHxqRUCKjwOBa X3/i6JLBmJTbkxJAVwSrh+0SNDEL/gJFLHMYDRBg= From: Tomi Valkeinen Date: Fri, 15 May 2026 12:09:28 +0300 Subject: [PATCH v3 3/7] drm/rcar-du: dsc: Add rudimentary Renesas R-Car V4H DSC driver MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260515-rcar-du-dsc-v3-3-164157820498@ideasonboard.com> References: <20260515-rcar-du-dsc-v3-0-164157820498@ideasonboard.com> In-Reply-To: <20260515-rcar-du-dsc-v3-0-164157820498@ideasonboard.com> To: Geert Uytterhoeven , Michael Turquette , Stephen Boyd , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm , Marek Vasut , Laurent Pinchart , Kieran Bingham , Philipp Zabel Cc: linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, Tomi Valkeinen X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=6565; i=tomi.valkeinen+renesas@ideasonboard.com; h=from:subject:message-id; bh=6RyvOy1vah8aQPX1HFdDvKqRB82zoxBVZZhVCgvsUyA=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBqBuLhFN0yp5teWEOkskYB2ql72vclBl1/sxEOC LT9drD0m52JAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCagbi4QAKCRD6PaqMvJYe 9bQeD/sFyYDJEIEuhphmgTe6g1E/czzHU26oTe2EOUg3M9/XNs9WOGk0NVyoA31lX+FynyZJIi4 C0ul+PhnjlL8tcQA8LgtUjXGI39Gb+9xfl1HQSx92tc82eXP+HB9CB3hczFjA2yVdYWI1uEnwOD yZaKkeckKpAfwaXHi+KVq2yTCHxGBggECOTejQPzoAvUtBtbr9ZGJjde8aBGRH7PAFnnvD9aRS8 7KCRoy2XLKckvcQjitWwTH+byJp6IUiwacjqPjohod/HzUfRR3u5uCzeHCN+hF4D4NNoBytcdfI 79lwbU1XTkO63l7CCvU0UoOk7/Nup+rOrntZtWdZfOlj4BKUQZMcoXAe/wVoLo98KS2vLCmorsl lyjpUOhjHqetawnGbPHPXQuBqkd7OlDNZpJmsx8hoI9Cdlq38sfz+hTiCzuPRb1RHiC0tPH6oLz wmZDy9ONBM7iGVPXSMMt8OnMTtmjHjeEVpCX+AgDVC0gkQugslqezKjlhliFgFYhy1fZAFKas2K OXJ6dgqb47w0B4mEzlm7pNzos4m/fioTxgFrxbJ6SgJ8etGlCmw1o1qHXT8Em9lEtm9jUZySAiZ 9NOKNneeFc39JNzo3+zWaBMGw3Ccp1+kPzIluNSmE/UtLtiSPSBNTY9sqMbYM39f/exD67lb+qh NeB4EoGoCPRyi8g== X-Developer-Key: i=tomi.valkeinen+renesas@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Marek Vasut The Renesas DSC Display Stream Compression is a bridge embedded in the Renesas R-Car V4H SoC. The bridge performs VESA DSC encoding of up to 8k or 400 Mpixel/s . Add rudimentary driver, which currently acts as a pass-through bridge and allows DSI1 to be operational on R-Car V4H. Signed-off-by: Marek Vasut [tomi.valkeinen: use bridge->next_bridge, minor changes] Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/renesas/rcar-du/Kconfig | 12 +++ drivers/gpu/drm/renesas/rcar-du/Makefile | 1 + drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c | 160 +++++++++++++++++++++++++++++ 3 files changed, 173 insertions(+) diff --git a/drivers/gpu/drm/renesas/rcar-du/Kconfig b/drivers/gpu/drm/renesas/rcar-du/Kconfig index 840305fdeb49..c58dba949d85 100644 --- a/drivers/gpu/drm/renesas/rcar-du/Kconfig +++ b/drivers/gpu/drm/renesas/rcar-du/Kconfig @@ -33,6 +33,18 @@ config DRM_RCAR_DW_HDMI help Enable support for R-Car Gen3 or RZ/G2 internal HDMI encoder. +config DRM_RCAR_USE_DSC + bool "R-Car DU DSC Encoder Support" + depends on DRM_BRIDGE && OF + depends on DRM_RCAR_DU || COMPILE_TEST + default DRM_RCAR_DU + help + Enable support for the R-Car Display Unit embedded DSC encoder. + +config DRM_RCAR_DSC + def_tristate DRM_RCAR_DU + depends on DRM_RCAR_USE_DSC + config DRM_RCAR_USE_LVDS bool "R-Car DU LVDS Encoder Support" depends on DRM_BRIDGE && OF diff --git a/drivers/gpu/drm/renesas/rcar-du/Makefile b/drivers/gpu/drm/renesas/rcar-du/Makefile index 6f132325c8b7..cc27b2265d94 100644 --- a/drivers/gpu/drm/renesas/rcar-du/Makefile +++ b/drivers/gpu/drm/renesas/rcar-du/Makefile @@ -12,5 +12,6 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_WRITEBACK) += rcar_du_writeback.o obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o +obj-$(CONFIG_DRM_RCAR_DSC) += rcar_dsc.o obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o obj-$(CONFIG_DRM_RCAR_MIPI_DSI) += rcar_mipi_dsi.o diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c b/drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c new file mode 100644 index 000000000000..5d3d083e3ce6 --- /dev/null +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * R-Car DSC Encoder + * + * Copyright (C) 2025 Marek Vasut + * Copyright (C) 2025 Renesas Electronics Corporation + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +struct rcar_dsc { + struct drm_bridge bridge; + + struct device *dev; + void __iomem *mmio; +}; + +static inline struct rcar_dsc *bridge_to_rcar_dsc(struct drm_bridge *bridge) +{ + return container_of(bridge, struct rcar_dsc, bridge); +} + +/* ----------------------------------------------------------------------------- + * Bridge + */ + +static int rcar_dsc_attach(struct drm_bridge *bridge, + struct drm_encoder *encoder, + enum drm_bridge_attach_flags flags) +{ + struct rcar_dsc *dsc = bridge_to_rcar_dsc(bridge); + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) + return -EINVAL; + + return drm_bridge_attach(encoder, dsc->bridge.next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +static void rcar_dsc_atomic_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct rcar_dsc *dsc = bridge_to_rcar_dsc(bridge); + + WARN_ON(pm_runtime_resume_and_get(dsc->dev)); +} + +static void rcar_dsc_atomic_disable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct rcar_dsc *dsc = bridge_to_rcar_dsc(bridge); + + pm_runtime_put(dsc->dev); +} + +static enum drm_mode_status +rcar_dsc_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_info *info, + const struct drm_display_mode *mode) +{ + if (mode->hdisplay < 320 || mode->hdisplay > 8190) + return MODE_BAD_HVALUE; + + if (mode->vdisplay < 160 || mode->vdisplay > 8190) + return MODE_BAD_VVALUE; + + if (mode->clock > 400000) /* Really 400 Mpixel/s */ + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +static const struct drm_bridge_funcs rcar_dsc_bridge_ops = { + .attach = rcar_dsc_attach, + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_reset = drm_atomic_helper_bridge_reset, + .atomic_enable = rcar_dsc_atomic_enable, + .atomic_disable = rcar_dsc_atomic_disable, + .mode_valid = rcar_dsc_bridge_mode_valid, +}; + +/* ----------------------------------------------------------------------------- + * Probe & Remove + */ + +static int rcar_dsc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *remote; + struct rcar_dsc *dsc; + int ret; + + dsc = devm_drm_bridge_alloc(dev, struct rcar_dsc, bridge, + &rcar_dsc_bridge_ops); + if (IS_ERR(dsc)) + return PTR_ERR(dsc); + + platform_set_drvdata(pdev, dsc); + + dsc->dev = &pdev->dev; + + dsc->mmio = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dsc->mmio)) + return PTR_ERR(dsc->mmio); + + remote = of_graph_get_remote_node(dev->of_node, 1, 0); + if (!remote) + return -EINVAL; + + dsc->bridge.next_bridge = of_drm_find_and_get_bridge(remote); + of_node_put(remote); + if (!dsc->bridge.next_bridge) + return -EPROBE_DEFER; + + dsc->bridge.of_node = dev->of_node; + + ret = devm_drm_bridge_add(dev, &dsc->bridge); + if (ret) + return ret; + + pm_runtime_enable(&pdev->dev); + + return 0; +} + +static void rcar_dsc_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); +} + +static const struct of_device_id rcar_dsc_of_table[] = { + { .compatible = "renesas,r8a779g0-dsc" }, + {} +}; + +MODULE_DEVICE_TABLE(of, rcar_dsc_of_table); + +static struct platform_driver rcar_dsc_platform_driver = { + .probe = rcar_dsc_probe, + .remove = rcar_dsc_remove, + .driver = { + .name = "rcar-dsc", + .of_match_table = rcar_dsc_of_table, + }, +}; + +module_platform_driver(rcar_dsc_platform_driver); + +MODULE_DESCRIPTION("Renesas R-Car DSC Encoder Driver"); +MODULE_LICENSE("GPL"); -- 2.43.0