From patchwork Fri Sep 14 09:10:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 10600465 X-Patchwork-Delegate: geert@linux-m68k.org 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 5FD2A1803 for ; Fri, 14 Sep 2018 09:10:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B1E92B104 for ; Fri, 14 Sep 2018 09:10:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FA772B110; Fri, 14 Sep 2018 09:10:44 +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 9E83B2B104 for ; Fri, 14 Sep 2018 09:10:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728067AbeINOYQ (ORCPT ); Fri, 14 Sep 2018 10:24:16 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:59414 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726618AbeINOYQ (ORCPT ); Fri, 14 Sep 2018 10:24:16 -0400 Received: from localhost.localdomain (unknown [IPv6:2a02:a03f:44f6:3500:d929:375b:d608:66c7]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D698E1AA2; Fri, 14 Sep 2018 11:10:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1536916239; bh=fSPjl3lJ2RskdN4xeDk+ko171mCyhsIVP8mPEdtY17M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D1uTFdCn55+bM9qFWbz9zIDCXKFrLVEEC0bhA1R/6OQRqgatts6DIWFEVu6Loh741 izjxd7dteVSn7SJWrt5bLGUuev2Q3G/+LI82bUPmvGr+bev1DHfYFOZj8IMBpdbb1U R2DVgutuLU1wpTgv2GXBTX+jGQhWvYI9g3fRHyJM= From: Laurent Pinchart To: dri-devel@lists.freedesktop.org Cc: linux-renesas-soc@vger.kernel.org, Ulrich Hecht , Kieran Bingham Subject: [PATCH v2 04/16] drm: bridge: thc63: Restrict modes based on hardware operating frequency Date: Fri, 14 Sep 2018 12:10:34 +0300 Message-Id: <20180914091046.483-5-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20180914091046.483-1-laurent.pinchart+renesas@ideasonboard.com> References: <20180914091046.483-1-laurent.pinchart+renesas@ideasonboard.com> 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 The THC63LVD1024 is restricted to a pixel clock frequency in the range of 8 to 135 MHz. Implement the bridge .mode_valid() operation accordingly. Signed-off-by: Laurent Pinchart Reviewed-by: Andrzej Hajda Tested-by: Jacopo Mondi --- drivers/gpu/drm/bridge/thc63lvd1024.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c b/drivers/gpu/drm/bridge/thc63lvd1024.c index c8b9edd5a7f4..63609ba16b6d 100644 --- a/drivers/gpu/drm/bridge/thc63lvd1024.c +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c @@ -45,6 +45,23 @@ static int thc63_attach(struct drm_bridge *bridge) return drm_bridge_attach(bridge->encoder, thc63->next, bridge); } +static enum drm_mode_status thc63_mode_valid(struct drm_bridge *bridge, + const struct drm_display_mode *mode) +{ + /* + * The THC63LVD0124 clock frequency range is 8 to 135 MHz in single-in, + * single-out mode. Note that the limits depends on the mode and will + * need to be adjusted accordingly. + */ + if (mode->clock < 8000) + return MODE_CLOCK_LOW; + + if (mode->clock > 135000) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + static void thc63_enable(struct drm_bridge *bridge) { struct thc63_dev *thc63 = to_thc63(bridge); @@ -77,6 +94,7 @@ static void thc63_disable(struct drm_bridge *bridge) static const struct drm_bridge_funcs thc63_bridge_func = { .attach = thc63_attach, + .mode_valid = thc63_mode_valid, .enable = thc63_enable, .disable = thc63_disable, };