From patchwork Wed Oct 10 11:41:31 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Kocialkowski X-Patchwork-Id: 10634397 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 7517A14DB for ; Wed, 10 Oct 2018 11:52:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 530B429D2C for ; Wed, 10 Oct 2018 11:52:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 518F629D95; Wed, 10 Oct 2018 11:52:30 +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=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EF99B29E1A for ; Wed, 10 Oct 2018 11:52:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 50B046E0E8; Wed, 10 Oct 2018 11:52:28 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from leonov.paulk.fr (leonov.paulk.fr [185.233.101.22]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8A2AA89E38 for ; Wed, 10 Oct 2018 11:52:22 +0000 (UTC) Received: from gagarine.paulk.fr (gagarine [192.168.1.127]) by leonov.paulk.fr (Postfix) with ESMTPS id 08CD7BFE1D for ; Wed, 10 Oct 2018 13:42:15 +0200 (CEST) Received: by gagarine.paulk.fr (Postfix, from userid 114) id 1ECAFC1008; Wed, 10 Oct 2018 13:42:14 +0200 (CEST) Received: from localhost.localdomain (collins [192.168.1.129]) by gagarine.paulk.fr (Postfix) with ESMTP id 8F5ABC04D1; Wed, 10 Oct 2018 13:41:55 +0200 (CEST) From: Paul Kocialkowski To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH 1/4] drm/sun4i: tcon: Support an active-low DE signal with RGB interface Date: Wed, 10 Oct 2018 13:41:31 +0200 Message-Id: <20181010114134.8211-1-contact@paulk.fr> X-Mailer: git-send-email 2.19.0 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Mark Van den Borre , Gerry Demaret , Maxime Ripard , linux-sunxi@googlegroups.com, Paul Kocialkowski , David Airlie , Chen-Yu Tsai , Rob Herring , Thierry Reding Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Some panels need an active-low data enable (DE) signal for the RGB interface. This requires flipping a bit in the TCON0 polarity register when setting up the mode for the RGB interface. Add a new helper function to match specific bus flags and use it to set the polarity inversion bit for the DE signal when required. Signed-off-by: Paul Kocialkowski --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 28 ++++++++++++++++++++++++++-- drivers/gpu/drm/sun4i/sun4i_tcon.h | 1 + 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 3fb084f802e2..d249a462ec09 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -78,6 +78,24 @@ static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder) return -EINVAL; } +static bool sun4i_tcon_match_bus_flags(const struct drm_encoder *encoder, + u32 bus_flags) +{ + struct drm_connector *connector; + struct drm_display_info *info; + + connector = sun4i_tcon_get_connector(encoder); + if (!connector) + return false; + + info = &connector->display_info; + + if ((info->bus_flags & bus_flags) == bus_flags) + return true; + + return false; +} + static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel, bool enabled) { @@ -415,6 +433,7 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, } static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder, const struct drm_display_mode *mode) { unsigned int bp, hsync, vsync; @@ -474,8 +493,13 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, if (mode->flags & DRM_MODE_FLAG_PVSYNC) val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE; + if (sun4i_tcon_match_bus_flags(encoder, DRM_BUS_FLAG_DE_LOW)) + val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE; + regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG, - SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | SUN4I_TCON0_IO_POL_VSYNC_POSITIVE, + SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | + SUN4I_TCON0_IO_POL_VSYNC_POSITIVE | + SUN4I_TCON0_IO_POL_DE_NEGATIVE, val); /* Map output pins to channel 0 */ @@ -596,7 +620,7 @@ void sun4i_tcon_mode_set(struct sun4i_tcon *tcon, sun4i_tcon0_mode_set_lvds(tcon, encoder, mode); break; case DRM_MODE_ENCODER_NONE: - sun4i_tcon0_mode_set_rgb(tcon, mode); + sun4i_tcon0_mode_set_rgb(tcon, encoder, mode); sun4i_tcon_set_mux(tcon, 0, encoder); break; case DRM_MODE_ENCODER_TVDAC: diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h index f6a071cd5a6f..708399c80561 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h @@ -113,6 +113,7 @@ #define SUN4I_TCON0_IO_POL_REG 0x88 #define SUN4I_TCON0_IO_POL_DCLK_PHASE(phase) ((phase & 3) << 28) +#define SUN4I_TCON0_IO_POL_DE_NEGATIVE BIT(27) #define SUN4I_TCON0_IO_POL_HSYNC_POSITIVE BIT(25) #define SUN4I_TCON0_IO_POL_VSYNC_POSITIVE BIT(24)