From patchwork Tue Sep 6 14:46:15 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 9317145 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0BDE360752 for ; Tue, 6 Sep 2016 14:50:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7616828D96 for ; Tue, 6 Sep 2016 14:50:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6A0D228DA8; Tue, 6 Sep 2016 14:50:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C1C0528D96 for ; Tue, 6 Sep 2016 14:50:23 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bhHfm-0000Fz-4e; Tue, 06 Sep 2016 14:48:26 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bhHe7-0007ni-Ds for linux-arm-kernel@lists.infradead.org; Tue, 06 Sep 2016 14:46:49 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id 1679F1738; Tue, 6 Sep 2016 16:46:24 +0200 (CEST) Received: from localhost (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id D922310E; Tue, 6 Sep 2016 16:46:23 +0200 (CEST) From: Maxime Ripard To: Daniel Vetter , David Airlie , Thierry Reding , Chen-Yu Tsai Subject: [PATCH v2 4/9] drm/sun4i: Add a DRC driver Date: Tue, 6 Sep 2016 16:46:15 +0200 Message-Id: <20160906144620.6322-5-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160906144620.6322-1-maxime.ripard@free-electrons.com> References: <20160906144620.6322-1-maxime.ripard@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160906_074644_056621_8051BC2D X-CRM114-Status: GOOD ( 20.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Petazzoni , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-sunxi@googlegroups.com, Rob Herring , Maxime Ripard , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The A33 pipeline also has a component called DRC. Even though its exact features and programming model is not known (or documented), it needs to be clocked for the pipeline to carry the video signal all the way. Add a minimal driver for it that just claim the needed resources for the pipeline to operate properly. Signed-off-by: Maxime Ripard Acked-by: Chen-Yu Tsai Acked-by: Peter Korsgaard --- .../bindings/display/sunxi/sun4i-drm.txt | 24 +++++ drivers/gpu/drm/sun4i/Makefile | 2 +- drivers/gpu/drm/sun4i/sun6i_drc.c | 118 +++++++++++++++++++++ 3 files changed, 143 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/sun4i/sun6i_drc.c diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt index d3529f72ca91..2b8a216790cb 100644 --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt @@ -51,6 +51,30 @@ Required properties: second the block connected to the TCON channel 1 (usually the TV encoder) +DRC +--- + +The DRC (Dynamic Range Controller), found in the latest Allwinner SoCs +(A31, A23, A33), allows to dynamically adjust pixel +brightness/contrast based on histogram measurements for LCD content +adaptive backlight control. + + +Required properties: + - compatible: value must be one of: + * allwinner,sun8i-a33-drc + - reg: base address and size of the memory-mapped region. + - interrupts: interrupt associated to this IP + - clocks: phandles to the clocks feeding the DRC + * ahb: the DRC interface clock + * mod: the DRC module clock + * ram: the DRC DRAM clock + - clock-names: the clock names mentioned above + - resets: phandles to the reset line driving the DRC + +- ports: A ports node with endpoint definitions as defined in + Documentation/devicetree/bindings/media/video-interfaces.txt. The + first port should be the input endpoints, the second one the outputs Display Engine Backend ---------------------- diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile index 58cd55149827..d625a82a6e5f 100644 --- a/drivers/gpu/drm/sun4i/Makefile +++ b/drivers/gpu/drm/sun4i/Makefile @@ -9,5 +9,5 @@ sun4i-tcon-y += sun4i_dotclock.o obj-$(CONFIG_DRM_SUN4I) += sun4i-drm.o sun4i-tcon.o obj-$(CONFIG_DRM_SUN4I) += sun4i_backend.o - +obj-$(CONFIG_DRM_SUN4I) += sun6i_drc.o obj-$(CONFIG_DRM_SUN4I) += sun4i_tv.o diff --git a/drivers/gpu/drm/sun4i/sun6i_drc.c b/drivers/gpu/drm/sun4i/sun6i_drc.c new file mode 100644 index 000000000000..bf6d846d8132 --- /dev/null +++ b/drivers/gpu/drm/sun4i/sun6i_drc.c @@ -0,0 +1,118 @@ +/* + * Copyright (C) 2016 Free Electrons + * + * Maxime Ripard + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include + +struct sun6i_drc { + struct clk *bus_clk; + struct clk *mod_clk; + struct reset_control *reset; +}; + +static int sun6i_drc_bind(struct device *dev, struct device *master, + void *data) +{ + struct sun6i_drc *drc; + int ret; + + drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL); + if (!drc) + return -ENOMEM; + dev_set_drvdata(dev, drc); + + drc->reset = devm_reset_control_get(dev, NULL); + if (IS_ERR(drc->reset)) { + dev_err(dev, "Couldn't get our reset line\n"); + return PTR_ERR(drc->reset); + } + + ret = reset_control_deassert(drc->reset); + if (ret) { + dev_err(dev, "Couldn't deassert our reset line\n"); + return ret; + } + + drc->bus_clk = devm_clk_get(dev, "ahb"); + if (IS_ERR(drc->bus_clk)) { + dev_err(dev, "Couldn't get our bus clock\n"); + ret = PTR_ERR(drc->bus_clk); + goto err_assert_reset; + } + clk_prepare_enable(drc->bus_clk); + + drc->mod_clk = devm_clk_get(dev, "mod"); + if (IS_ERR(drc->mod_clk)) { + dev_err(dev, "Couldn't get our mod clock\n"); + ret = PTR_ERR(drc->mod_clk); + goto err_disable_bus_clk; + } + clk_prepare_enable(drc->mod_clk); + + return 0; + +err_disable_bus_clk: + clk_disable_unprepare(drc->bus_clk); +err_assert_reset: + reset_control_assert(drc->reset); + return ret; +} + +static void sun6i_drc_unbind(struct device *dev, struct device *master, + void *data) +{ + struct sun6i_drc *drc = dev_get_drvdata(dev); + + clk_disable_unprepare(drc->mod_clk); + clk_disable_unprepare(drc->bus_clk); + reset_control_assert(drc->reset); +} + +static struct component_ops sun6i_drc_ops = { + .bind = sun6i_drc_bind, + .unbind = sun6i_drc_unbind, +}; + +static int sun6i_drc_probe(struct platform_device *pdev) +{ + return component_add(&pdev->dev, &sun6i_drc_ops); +} + +static int sun6i_drc_remove(struct platform_device *pdev) +{ + component_del(&pdev->dev, &sun6i_drc_ops); + + return 0; +} + +static const struct of_device_id sun6i_drc_of_table[] = { + { .compatible = "allwinner,sun8i-a33-drc" }, + { } +}; +MODULE_DEVICE_TABLE(of, sun6i_drc_of_table); + +static struct platform_driver sun6i_drc_platform_driver = { + .probe = sun6i_drc_probe, + .remove = sun6i_drc_remove, + .driver = { + .name = "sun6i-drc", + .of_match_table = sun6i_drc_of_table, + }, +}; +module_platform_driver(sun6i_drc_platform_driver); + +MODULE_AUTHOR("Maxime Ripard "); +MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver"); +MODULE_LICENSE("GPL");