From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17B67C678D5 for ; Tue, 7 Mar 2023 19:11:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233738AbjCGTLs (ORCPT ); Tue, 7 Mar 2023 14:11:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231316AbjCGTK5 (ORCPT ); Tue, 7 Mar 2023 14:10:57 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CE74C9C0A for ; Tue, 7 Mar 2023 10:55:32 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 0D5ACB8117B for ; Tue, 7 Mar 2023 18:55:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E251C4339B; Tue, 7 Mar 2023 18:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678215328; bh=V/NKCi/fxG1NnUo+e3tbEbovrFW2pa+udvzYoKWUXZs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RW3x0mFk8HKcKn646JHg//xrrSCplmUsgSP7IXMMZPuFtZEM0GF0nE/bIjScZdSwk NeSGkMDdhOp3LM6lsgsXsJsFyPHxwokNx8f6sygsu2B8zhIIAoSO2QPew2TiFxxKUI g/4KSYf/sYr+O5cjVp+VUtP9Iv4DYJYhCd72jDSM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Neil Armstrong , Dmitry Baryshkov , Sasha Levin Subject: [PATCH 5.15 194/567] drm/bridge: lt9611: fix HPD reenablement Date: Tue, 7 Mar 2023 17:58:50 +0100 Message-Id: <20230307165914.351345060@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307165905.838066027@linuxfoundation.org> References: <20230307165905.838066027@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dmitry Baryshkov [ Upstream commit a7790f6bd38f3642b60ae3504a2c749135b89451 ] The driver will reset the bridge in the atomic_pre_enable(). However this will also drop the HPD interrupt state. Instead of resetting the bridge, properly wake it up. This fixes the HPD interrupt delivery after the disable/enable cycle. Fixes: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge") Reviewed-by: Neil Armstrong Signed-off-by: Dmitry Baryshkov Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-3-dmitry.baryshkov@linaro.org Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/lontium-lt9611.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index 5e5641ac5ea3d..fe660d667daf6 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -880,12 +880,18 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge, static void lt9611_bridge_pre_enable(struct drm_bridge *bridge) { struct lt9611 *lt9611 = bridge_to_lt9611(bridge); + static const struct reg_sequence reg_cfg[] = { + { 0x8102, 0x12 }, + { 0x8123, 0x40 }, + { 0x8130, 0xea }, + { 0x8011, 0xfa }, + }; if (!lt9611->sleep) return; - lt9611_reset(lt9611); - regmap_write(lt9611->regmap, 0x80ee, 0x01); + regmap_multi_reg_write(lt9611->regmap, + reg_cfg, ARRAY_SIZE(reg_cfg)); lt9611->sleep = false; } -- 2.39.2