From patchwork Fri May 3 15:11:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 794566 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (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 E79B64A99C for ; Fri, 3 May 2024 15:12:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714749159; cv=none; b=eOtmeACDgTh+6p+Wa3wulZbUaD4Z69A3XGyEflF7tRxxNnsxnmNCQtLbDA4dd6zNzVeyTCQhu8Au1ShUsPfkFdCnLL+KOO6Y+zVg/9K+Xlec4BkjVjOYiuN08Ynb/QhmNK2YaEsHFNXMUHjuW2w+YuQ6DHCdtxg0lOxNDyN0tpk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714749159; c=relaxed/simple; bh=XKwgQB8BTzRSAvLa3vFMcBdmOgL8f0hZbJ0Ugp2hI14=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BEs7bVWMxmo6z/XtwkeLzDUyMbTdesbWuX6+D8mFAxcbdiZOSyjxKOvRrZHNbMl6NeVT6nVBzrsSZZjtIcIONgeDvZBXtwqb7kT8l4hw4V1UwNysiKgPsyMU9nyiV2Gr42ARoOn981hJR1ptzphzRvZiylmhuELV4WOIeCSLUTY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1s2uaK-0004wr-Kz; Fri, 03 May 2024 17:12:28 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1s2uZO-00FjHY-KM; Fri, 03 May 2024 17:11:30 +0200 From: Lucas Stach To: =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Sandy Huang , Jingoo Han , Inki Dae , Seung-Woo Kim , Kyungmin Park , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec Cc: linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, kernel@pengutronix.de, patchwork-lst@pengutronix.de Subject: [PATCH 13/14] drm/bridge: analogix_dp: only read AUX status when an error occured Date: Fri, 3 May 2024 17:11:28 +0200 Message-Id: <20240503151129.3901815-14-l.stach@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240503151129.3901815-1-l.stach@pengutronix.de> References: <20240503151129.3901815-1-l.stach@pengutronix.de> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-samsung-soc@vger.kernel.org All AUX error responses raise the AUX_ERR interrupt, so there is no need to read the AUX status register in normal operation. Only read the status when an error occured and we can expect a different status than OK. Signed-off-by: Lucas Stach Reviewed-by: Robert Foss --- drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c index 143a78b1d156..0f016dca9f3d 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c @@ -924,7 +924,6 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, struct drm_dp_aux_msg *msg) { u32 reg; - u32 status_reg; u8 *buffer = msg->buffer; unsigned int i; int ret; @@ -1011,12 +1010,14 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, /* Clear interrupt source for AUX CH access error */ reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA); - status_reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA); - if ((reg & AUX_ERR) || (status_reg & AUX_STATUS_MASK)) { + if ((reg & AUX_ERR)) { + u32 aux_status = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA) & + AUX_STATUS_MASK; + writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA); dev_warn(dp->dev, "AUX CH error happened: %#x (%d)\n", - status_reg & AUX_STATUS_MASK, !!(reg & AUX_ERR)); + aux_status, !!(reg & AUX_ERR)); goto aux_error; }