From patchwork Wed Jun 19 18:21:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 13704426 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E05A5C27C53 for ; Wed, 19 Jun 2024 18:43:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 761D910ED86; Wed, 19 Jun 2024 18:43:27 +0000 (UTC) Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) by gabe.freedesktop.org (Postfix) with ESMTPS id 82D0410ED83 for ; Wed, 19 Jun 2024 18:43:25 +0000 (UTC) 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 1sK0H5-0005be-UT; Wed, 19 Jun 2024 20:43:15 +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 1sJzwX-003WTo-A7; Wed, 19 Jun 2024 20:22:01 +0200 From: Lucas Stach To: Robert Foss Cc: Neil Armstrong , Andrzej Hajda , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, patchwork-lst@pengutronix.de, kernel@pengutronix.de Subject: [PATCH v2 13/14] drm/bridge: analogix_dp: only read AUX status when an error occured Date: Wed, 19 Jun 2024 20:21:59 +0200 Message-Id: <20240619182200.3752465-13-l.stach@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240619182200.3752465-1-l.stach@pengutronix.de> References: <20240619182200.3752465-1-l.stach@pengutronix.de> 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: dri-devel@lists.freedesktop.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 occurred and we can expect a different status than OK. Signed-off-by: Lucas Stach Reviewed-by: Robert Foss Tested-by: Heiko Stuebner (rk3288-veyron and rk3399-gru) --- 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; }