From patchwork Sun Jul 16 10:48:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 9842879 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 75761603B4 for ; Sun, 16 Jul 2017 10:48:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5223228402 for ; Sun, 16 Jul 2017 10:48:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4705028459; Sun, 16 Jul 2017 10:48:11 +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=-6.9 required=2.0 tests=BAYES_00,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 D8E6B28404 for ; Sun, 16 Jul 2017 10:48:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751238AbdGPKsJ (ORCPT ); Sun, 16 Jul 2017 06:48:09 -0400 Received: from lb3-smtp-cloud3.xs4all.net ([194.109.24.30]:38468 "EHLO lb3-smtp-cloud3.xs4all.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbdGPKsH (ORCPT ); Sun, 16 Jul 2017 06:48:07 -0400 Received: from marune.fritz.box ([80.101.105.217]) by smtp-cloud3.xs4all.net with ESMTP id lNo41v00Q4hSry801No6MR; Sun, 16 Jul 2017 12:48:06 +0200 From: Hans Verkuil To: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org, Eric Anholt , boris.brezillon@free-electrons.com, Hans Verkuil Subject: [PATCHv2 2/3] drm/vc4: prepare for CEC support Date: Sun, 16 Jul 2017 12:48:03 +0200 Message-Id: <20170716104804.48308-3-hverkuil@xs4all.nl> X-Mailer: git-send-email 2.13.2 In-Reply-To: <20170716104804.48308-1-hverkuil@xs4all.nl> References: <20170716104804.48308-1-hverkuil@xs4all.nl> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Hans Verkuil In order to support CEC the hsm clock needs to be enabled in vc4_hdmi_bind(), not in vc4_hdmi_encoder_enable(). Otherwise you wouldn't be able to support CEC when there is no hotplug detect signal, which is required by some monitors that turn off the HPD when in standby, but keep the CEC bus alive so they can be woken up. The HDMI core also has to be enabled in vc4_hdmi_bind() for the same reason. Signed-off-by: Hans Verkuil --- drivers/gpu/drm/vc4/vc4_hdmi.c | 59 +++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index ed63d4e85762..e0104f96011e 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -463,11 +463,6 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder) HD_WRITE(VC4_HD_VID_CTL, HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE); - HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST); - udelay(1); - HD_WRITE(VC4_HD_M_CTL, 0); - - clk_disable_unprepare(hdmi->hsm_clock); clk_disable_unprepare(hdmi->pixel_clock); ret = pm_runtime_put(&hdmi->pdev->dev); @@ -509,16 +504,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) return; } - /* This is the rate that is set by the firmware. The number - * needs to be a bit higher than the pixel clock rate - * (generally 148.5Mhz). - */ - ret = clk_set_rate(hdmi->hsm_clock, 163682864); - if (ret) { - DRM_ERROR("Failed to set HSM clock rate: %d\n", ret); - return; - } - ret = clk_set_rate(hdmi->pixel_clock, mode->clock * 1000 * ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1)); @@ -533,20 +518,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) return; } - ret = clk_prepare_enable(hdmi->hsm_clock); - if (ret) { - DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n", - ret); - clk_disable_unprepare(hdmi->pixel_clock); - return; - } - - HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST); - udelay(1); - HD_WRITE(VC4_HD_M_CTL, 0); - - HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE); - HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL, VC4_HDMI_SW_RESET_HDMI | VC4_HDMI_SW_RESET_FORMAT_DETECT); @@ -1205,6 +1176,23 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) return -EPROBE_DEFER; } + /* This is the rate that is set by the firmware. The number + * needs to be a bit higher than the pixel clock rate + * (generally 148.5Mhz). + */ + ret = clk_set_rate(hdmi->hsm_clock, 163682864); + if (ret) { + DRM_ERROR("Failed to set HSM clock rate: %d\n", ret); + goto err_put_i2c; + } + + ret = clk_prepare_enable(hdmi->hsm_clock); + if (ret) { + DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n", + ret); + goto err_put_i2c; + } + /* Only use the GPIO HPD pin if present in the DT, otherwise * we'll use the HDMI core's register. */ @@ -1216,7 +1204,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) &hpd_gpio_flags); if (hdmi->hpd_gpio < 0) { ret = hdmi->hpd_gpio; - goto err_put_i2c; + goto err_unprepare_hsm; } hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW; @@ -1224,6 +1212,14 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) vc4->hdmi = hdmi; + /* HDMI core must be enabled. */ + if (!(HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE)) { + HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST); + udelay(1); + HD_WRITE(VC4_HD_M_CTL, 0); + + HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE); + } pm_runtime_enable(dev); drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs, @@ -1244,6 +1240,8 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) err_destroy_encoder: vc4_hdmi_encoder_destroy(hdmi->encoder); +err_unprepare_hsm: + clk_disable_unprepare(hdmi->hsm_clock); pm_runtime_disable(dev); err_put_i2c: put_device(&hdmi->ddc->dev); @@ -1263,6 +1261,7 @@ static void vc4_hdmi_unbind(struct device *dev, struct device *master, vc4_hdmi_connector_destroy(hdmi->connector); vc4_hdmi_encoder_destroy(hdmi->encoder); + clk_disable_unprepare(hdmi->hsm_clock); pm_runtime_disable(dev); put_device(&hdmi->ddc->dev);