From patchwork Tue Feb 3 18:35:03 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Zabel X-Patchwork-Id: 5771031 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 07F28BF90F for ; Tue, 3 Feb 2015 18:35:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 29D73201FA for ; Tue, 3 Feb 2015 18:35:20 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 4169D20254 for ; Tue, 3 Feb 2015 18:35:19 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 019376E510; Tue, 3 Feb 2015 10:35:14 -0800 (PST) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [92.198.50.35]) by gabe.freedesktop.org (Postfix) with ESMTP id C54B56E640 for ; Tue, 3 Feb 2015 10:35:11 -0800 (PST) Received: from dude.hi.4.pengutronix.de ([10.1.0.7] helo=dude.pengutronix.de.) by metis.ext.pengutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1YIiJb-0001WO-0r; Tue, 03 Feb 2015 19:35:11 +0100 From: Philipp Zabel To: dri-devel@lists.freedesktop.org Subject: [PATCH v2 09/10] drm/imx: imx-ldb: reset display clock input when disabling LVDS Date: Tue, 3 Feb 2015 19:35:03 +0100 Message-Id: <1422988504-11123-10-git-send-email-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1422988504-11123-1-git-send-email-p.zabel@pengutronix.de> References: <1422988504-11123-1-git-send-email-p.zabel@pengutronix.de> X-SA-Exim-Connect-IP: 10.1.0.7 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: dri-devel@lists.freedesktop.org Cc: Emil Renner Berthing , Mauro Carvalho Chehab , Hans Verkuil , Laurent Pinchart , Sakari Ailus , Steve Longerbeam , Russell King , kernel@pengutronix.de X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The LDB driver changes the attached display interface's input clock mux to the LDB_DI clock reference. Change it back again when disabling the LVDS display. Changing back to the PLL5 for example allows to configure the same DI for HDMI output later. Signed-off-by: Philipp Zabel --- drivers/gpu/drm/imx/imx-ldb.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index 4286399..544282b 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -77,6 +77,7 @@ struct imx_ldb { struct imx_ldb_channel channel[2]; struct clk *clk[2]; /* our own clock */ struct clk *clk_sel[4]; /* parent of display clock */ + struct clk *clk_parent[4]; /* original parent of clk_sel */ struct clk *clk_pll[2]; /* upstream clock we can adjust */ u32 ldb_ctrl; const struct bus_mux *lvds_mux; @@ -287,6 +288,7 @@ static void imx_ldb_encoder_disable(struct drm_encoder *encoder) { struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder); struct imx_ldb *ldb = imx_ldb_ch->ldb; + int mux, ret; /* * imx_ldb_encoder_disable is called by @@ -314,6 +316,28 @@ static void imx_ldb_encoder_disable(struct drm_encoder *encoder) clk_disable_unprepare(ldb->clk[1]); } + if (ldb->lvds_mux) { + const struct bus_mux *lvds_mux = NULL; + + if (imx_ldb_ch == &ldb->channel[0]) + lvds_mux = &ldb->lvds_mux[0]; + else if (imx_ldb_ch == &ldb->channel[1]) + lvds_mux = &ldb->lvds_mux[1]; + + regmap_read(ldb->regmap, lvds_mux->reg, &mux); + mux &= lvds_mux->mask; + mux >>= lvds_mux->shift; + } else { + mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1; + } + + /* set display clock mux back to original input clock */ + ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]); + if (ret) + dev_err(ldb->dev, + "unable to set di%d parent clock to original parent\n", + mux); + drm_panel_unprepare(imx_ldb_ch->panel); } @@ -499,6 +523,8 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) imx_ldb->clk_sel[i] = NULL; break; } + + imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]); } if (i == 0) return ret;