From patchwork Tue May 28 14:12:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 10965031 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 50E3B1398 for ; Tue, 28 May 2019 14:13:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 420A620453 for ; Tue, 28 May 2019 14:13:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2D3F2288BF; Tue, 28 May 2019 14:13:28 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 84B0327F7F for ; Tue, 28 May 2019 14:13:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726697AbfE1ON1 (ORCPT ); Tue, 28 May 2019 10:13:27 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:48962 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726532AbfE1ON1 (ORCPT ); Tue, 28 May 2019 10:13:27 -0400 Received: from pendragon.ideasonboard.com (85-76-65-42-nat.elisa-mobile.fi [85.76.65.42]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 13FB9D85; Tue, 28 May 2019 16:13:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1559052804; bh=raw1Oj6Ci2FQpYAOX+4ntr/0tEFBU9x0BV83lF7wU7w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XTSmazL6lYHNKbky2jAQhKAMXPV+hLDHvemObEeAx3qTOie1ZohB7d/FyHLDWdGMv KysHyjjkJOX/HdlRjpYl8UdESskZZsNNzFznKMZN4943VvmYpMJFScANov0I0Agg7z +5kAx/imxMkzkTm8JjkZeIGfTXPduXpZzjFtqkbo= From: Laurent Pinchart To: dri-devel@lists.freedesktop.org Cc: linux-renesas-soc@vger.kernel.org, Kieran Bingham , Jacopo Mondi Subject: [PATCH v3 06/10] drm: rcar-du: lvds: Add support for dual-link mode Date: Tue, 28 May 2019 17:12:30 +0300 Message-Id: <20190528141234.15425-7-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190528141234.15425-1-laurent.pinchart+renesas@ideasonboard.com> References: <20190528141234.15425-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In dual-link mode the LVDS0 encoder transmits even-numbered pixels, and sends odd-numbered pixels to the LVDS1 encoder for transmission on a separate link. To implement support for this mode of operation, determine if the LVDS connection operates in dual-link mode by querying the next device in the pipeline, locate the companion encoder, and control it directly through its bridge operations. Signed-off-by: Laurent Pinchart Reviewed-by: Jacopo Mondi Tested-by: Jacopo Mondi Reviewed-by: Kieran Bingham --- Changes since v2: - Fail probe if the companion controller can't be found or is invalid --- drivers/gpu/drm/rcar-du/rcar_lvds.c | 107 ++++++++++++++++++++++++---- drivers/gpu/drm/rcar-du/rcar_lvds.h | 5 ++ 2 files changed, 99 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c index a331f0c32187..d090191e858e 100644 --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c @@ -66,6 +66,9 @@ struct rcar_lvds { struct drm_display_mode display_mode; enum rcar_lvds_mode mode; + + struct drm_bridge *companion; + bool dual_link; }; #define bridge_to_rcar_lvds(bridge) \ @@ -400,11 +403,6 @@ static void rcar_lvds_enable(struct drm_bridge *bridge) { struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge); const struct drm_display_mode *mode = &lvds->display_mode; - /* - * FIXME: We should really retrieve the CRTC through the state, but how - * do we get a state pointer? - */ - struct drm_crtc *crtc = lvds->bridge.encoder->crtc; u32 lvdhcr; u32 lvdcr0; int ret; @@ -413,6 +411,10 @@ static void rcar_lvds_enable(struct drm_bridge *bridge) if (ret < 0) return; + /* Enable the companion LVDS encoder in dual-link mode. */ + if (lvds->dual_link && lvds->companion) + lvds->companion->funcs->enable(lvds->companion); + /* * Hardcode the channels and control signals routing for now. * @@ -435,17 +437,33 @@ static void rcar_lvds_enable(struct drm_bridge *bridge) rcar_lvds_write(lvds, LVDCHCR, lvdhcr); if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) { - /* Disable dual-link mode. */ - rcar_lvds_write(lvds, LVDSTRIPE, 0); + /* + * Configure vertical stripe based on the mode of operation of + * the connected device. + */ + rcar_lvds_write(lvds, LVDSTRIPE, + lvds->dual_link ? LVDSTRIPE_ST_ON : 0); } - /* PLL clock configuration. */ - lvds->info->pll_setup(lvds, mode->clock * 1000); + /* + * PLL clock configuration on all instances but the companion in + * dual-link mode. + */ + if (!lvds->dual_link || lvds->companion) + lvds->info->pll_setup(lvds, mode->clock * 1000); /* Set the LVDS mode and select the input. */ lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT; - if (drm_crtc_index(crtc) == 2) - lvdcr0 |= LVDCR0_DUSEL; + + if (lvds->bridge.encoder) { + /* + * FIXME: We should really retrieve the CRTC through the state, + * but how do we get a state pointer? + */ + if (drm_crtc_index(lvds->bridge.encoder->crtc) == 2) + lvdcr0 |= LVDCR0_DUSEL; + } + rcar_lvds_write(lvds, LVDCR0, lvdcr0); /* Turn all the channels on. */ @@ -512,6 +530,10 @@ static void rcar_lvds_disable(struct drm_bridge *bridge) rcar_lvds_write(lvds, LVDCR1, 0); rcar_lvds_write(lvds, LVDPLLCR, 0); + /* Disable the companion LVDS encoder in dual-link mode. */ + if (lvds->dual_link && lvds->companion) + lvds->companion->funcs->disable(lvds->companion); + clk_disable_unprepare(lvds->clocks.mod); } @@ -628,10 +650,57 @@ static const struct drm_bridge_funcs rcar_lvds_bridge_ops = { .mode_set = rcar_lvds_mode_set, }; +bool rcar_lvds_dual_link(struct drm_bridge *bridge) +{ + struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge); + + return lvds->dual_link; +} +EXPORT_SYMBOL_GPL(rcar_lvds_dual_link); + /* ----------------------------------------------------------------------------- * Probe & Remove */ +static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds) +{ + const struct of_device_id *match; + struct device_node *companion; + struct device *dev = lvds->dev; + int ret = 0; + + /* Locate the companion LVDS encoder for dual-link operation, if any. */ + companion = of_parse_phandle(dev->of_node, "renesas,companion", 0); + if (!companion) { + dev_err(dev, "Companion LVDS encoder not found\n"); + return -ENXIO; + } + + /* + * Sanity check: the companion encoder must have the same compatible + * string. + */ + match = of_match_device(dev->driver->of_match_table, dev); + if (!of_device_is_compatible(companion, match->compatible)) { + dev_err(dev, "Companion LVDS encoder is invalid\n"); + ret = -ENXIO; + goto done; + } + + lvds->companion = of_drm_find_bridge(companion); + if (!lvds->companion) { + ret = -EPROBE_DEFER; + goto done; + } + + dev_dbg(dev, "Found companion encoder %pOF\n", companion); + +done: + of_node_put(companion); + + return ret; +} + static int rcar_lvds_parse_dt(struct rcar_lvds *lvds) { struct device_node *local_output = NULL; @@ -682,14 +751,26 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds) if (is_bridge) { lvds->next_bridge = of_drm_find_bridge(remote); - if (!lvds->next_bridge) + if (!lvds->next_bridge) { ret = -EPROBE_DEFER; + goto done; + } + + if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) + lvds->dual_link = lvds->next_bridge->timings + ? lvds->next_bridge->timings->dual_link + : false; } else { lvds->panel = of_drm_find_panel(remote); - if (IS_ERR(lvds->panel)) + if (IS_ERR(lvds->panel)) { ret = PTR_ERR(lvds->panel); + goto done; + } } + if (lvds->dual_link) + ret = rcar_lvds_parse_dt_companion(lvds); + done: of_node_put(local_output); of_node_put(remote_input); diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.h b/drivers/gpu/drm/rcar-du/rcar_lvds.h index a709cae1bc32..222ec0e60785 100644 --- a/drivers/gpu/drm/rcar-du/rcar_lvds.h +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.h @@ -15,6 +15,7 @@ struct drm_bridge; #if IS_ENABLED(CONFIG_DRM_RCAR_LVDS) int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq); void rcar_lvds_clk_disable(struct drm_bridge *bridge); +bool rcar_lvds_dual_link(struct drm_bridge *bridge); #else static inline int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq) @@ -22,6 +23,10 @@ static inline int rcar_lvds_clk_enable(struct drm_bridge *bridge, return -ENOSYS; } static inline void rcar_lvds_clk_disable(struct drm_bridge *bridge) { } +static inline bool rcar_lvds_dual_link(struct drm_bridge *bridge) +{ + return false; +} #endif /* CONFIG_DRM_RCAR_LVDS */ #endif /* __RCAR_LVDS_H__ */