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 E5601C46467 for ; Mon, 10 Oct 2022 00:26:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232674AbiJJA0S (ORCPT ); Sun, 9 Oct 2022 20:26:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232748AbiJJAWf (ORCPT ); Sun, 9 Oct 2022 20:22:35 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7037860E2; Sun, 9 Oct 2022 16:56:29 -0700 (PDT) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 0CFCE60DC9; Sun, 9 Oct 2022 23:56:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFB09C433B5; Sun, 9 Oct 2022 23:56:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665359788; bh=t5hmdcnuv44cMjaNtCCxpqakrK7D417F3SSIMY/c0Z4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cPUS2mQEoLB7D5uHxi0bjrnzXERMxnG7CyPUIxxJJDKG/mFo2ttCAyfv3WvMCGTMZ GanntesZXmUDwKjuEVi99j9UhLFgQ39sUfQSH/6kRQd6j0GUszLAWdMecoccTOPZ1o 73UQYgR79U+Kbx3o2E43ArFSW3FFkwIXOw0j8jMFol71SQ6wHrwIeUNVlTyWGwX627 N38K2KUcDh9Efe2w/iX8zCVXNcPFJPld6CFz9zGkQoiiyPGVe2XNpgVp4kSwgggfbN TSlu5+02ccKyzdBOKAiXoTI6aVkX3IYh2dOcb10y3FzOkTscuzJQIMcGHQzeuKX8k/ 3HwjixwLhkIww== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lucas Stach , Neil Armstrong , Robert Foss , Sasha Levin , andrzej.hajda@intel.com, neil.armstrong@linaro.org, airlied@gmail.com, daniel@ffwll.ch, Sandor.yu@nxp.com, ville.syrjala@linux.intel.com, sam@ravnborg.org, tzimmermann@suse.de, maxime@cerno.tech, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.10 08/22] drm: bridge: dw_hdmi: only trigger hotplug event on link change Date: Sun, 9 Oct 2022 19:55:26 -0400 Message-Id: <20221009235540.1231640-8-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221009235540.1231640-1-sashal@kernel.org> References: <20221009235540.1231640-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lucas Stach [ Upstream commit da09daf881082266e4075657fac53c7966de8e4d ] There are two events that signal a real change of the link state: HPD going high means the sink is newly connected or wants the source to re-read the EDID, RX sense going low is a indication that the link has been disconnected. Ignore the other two events that also trigger interrupts, but don't need immediate attention: HPD going low does not necessarily mean the link has been lost and should not trigger a immediate read of the status. RX sense going high also does not require a detect cycle, as HPD going high is the right point in time to read the EDID. Signed-off-by: Lucas Stach Reviewed-by: Neil Armstrong (v1) Reviewed-by: Robert Foss Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20220826185733.3213248-1-l.stach@pengutronix.de Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index b10228b9e3a9..356c7d0bd035 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -2984,6 +2984,7 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id) { struct dw_hdmi *hdmi = dev_id; u8 intr_stat, phy_int_pol, phy_pol_mask, phy_stat; + enum drm_connector_status status = connector_status_unknown; intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0); phy_int_pol = hdmi_readb(hdmi, HDMI_PHY_POL0); @@ -3022,13 +3023,15 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id) cec_notifier_phys_addr_invalidate(hdmi->cec_notifier); mutex_unlock(&hdmi->cec_notifier_mutex); } - } - if (intr_stat & HDMI_IH_PHY_STAT0_HPD) { - enum drm_connector_status status = phy_int_pol & HDMI_PHY_HPD - ? connector_status_connected - : connector_status_disconnected; + if (phy_stat & HDMI_PHY_HPD) + status = connector_status_connected; + + if (!(phy_stat & (HDMI_PHY_HPD | HDMI_PHY_RX_SENSE))) + status = connector_status_disconnected; + } + if (status != connector_status_unknown) { dev_dbg(hdmi->dev, "EVENT=%s\n", status == connector_status_connected ? "plugin" : "plugout"); -- 2.35.1