From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E31848820 for ; Fri, 10 Mar 2023 14:52:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B68BC433A0; Fri, 10 Mar 2023 14:52:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678459943; bh=V/NKCi/fxG1NnUo+e3tbEbovrFW2pa+udvzYoKWUXZs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zfkUpNhUyOULBGzUndVOzRWw00vdxYJ3X5vwWwyjrMKcnokXHIBehN0R+LMti5Jvy HYMe2vPP1XSB7K48RDN4ALMmoO68Qo9Rc583GIT0a04OPLPCyTmKRP9XNG8fJDVlC8 Tdvf+JVI88a0hXgsqOvwEL4KSAQh+gY77s8gYuw4= 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 5.10 171/529] drm/bridge: lt9611: fix HPD reenablement Date: Fri, 10 Mar 2023 14:35:14 +0100 Message-Id: <20230310133812.855009764@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133804.978589368@linuxfoundation.org> References: <20230310133804.978589368@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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