From patchwork Mon Apr 23 10:49:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Enric Balletbo i Serra X-Patchwork-Id: 10356859 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 662F160388 for ; Mon, 23 Apr 2018 11:18:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5462628A6C for ; Mon, 23 Apr 2018 11:18:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4710728A7C; Mon, 23 Apr 2018 11:18:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, MAILING_LIST_MULTI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A442428A6C for ; Mon, 23 Apr 2018 11:18:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=KULnQYyksDVjEJ//c3lZBQBV1Om6cNWwdsHggNEWP68=; b=FFAJqpBmu3jgNz KZiF8thdgm/8fLi7y5ND4rkv/1ntIik99KAtfDtImXJLtkAND7w5lkY3lHyws/UUVnHmPRJ+e52JC zAFoYrXJevySDrykjzYlQyp2CJtXwiksEZyTSfETjWu3V8cnPvmdhOc7Z6Xu6IQeHufxYuGGSlE/c BRabgzo7jr6o+JJG3cFyKTINZabNvZWLV4N2tyu6Bsbvbz4ElETr03LmOSTQY5JzKdkynDpmyUj6w 8Jt26/DjoYxBk3l9KuWeaAQdY9cLfXtR5cSQwy8xc/CdOqUCvlL41OLciffFSfpZAodK/I0FNCUpw pTOthJ2bhk1cx/3s8+yw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fAZUS-0001na-Hm; Mon, 23 Apr 2018 11:18:36 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fAZ3U-0007VN-4m; Mon, 23 Apr 2018 10:50:51 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id D9D44277B99 From: Enric Balletbo i Serra To: architt@codeaurora.org, inki.dae@samsung.com, thierry.reding@gmail.com, hjc@rock-chips.com, seanpaul@chromium.org, airlied@linux.ie, tfiga@chromium.org, heiko@sntech.de Subject: [RESEND PATCH v6 12/27] drm/bridge: analogix_dp: Reset aux channel if an error occurred Date: Mon, 23 Apr 2018 12:49:48 +0200 Message-Id: <20180423105003.9004-13-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180423105003.9004-1-enric.balletbo@collabora.com> References: <20180423105003.9004-1-enric.balletbo@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180423_035044_505794_EDE6603B X-CRM114-Status: UNSURE ( 9.66 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, a.hajda@samsung.com, Laurent.pinchart@ideasonboard.com, kernel@collabora.com, m.szyprowski@samsung.com, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, rydberg@bitmath.org, krzk@kernel.org, linux-rockchip@lists.infradead.org, kgene@kernel.org, orjan.eide@arm.com, wxt@rock-chips.com, jeffy.chen@rock-chips.com, linux-arm-kernel@lists.infradead.org, wzz@rock-chips.com, hl@rock-chips.com, jingoohan1@gmail.com, sw0312.kim@samsung.com, dianders@chromium.org, kyungmin.park@samsung.com, Enric Balletbo i Serra , kuankuan.y@gmail.com, hshi@chromium.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Lin Huang AUX errors are caused by many different reasons. We may not know what happened in aux channel on failure, so let's reset aux channel if some errors occurred. Cc: 征增 王 Cc: Douglas Anderson Signed-off-by: Lin Huang Signed-off-by: Sean Paul Signed-off-by: Thierry Escande Reviewed-by: Andrzej Hajda Tested-by: Marek Szyprowski Reviewed-by: Archit Taneja Signed-off-by: Enric Balletbo i Serra --- .../gpu/drm/bridge/analogix/analogix_dp_reg.c | 18 ++++++++++++++---- 1 file changed, 14 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 dee1ba109b5f..7b7fd227e1f9 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c @@ -466,6 +466,10 @@ void analogix_dp_init_aux(struct analogix_dp_device *dp) reg = RPLY_RECEIV | AUX_ERR; writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA); + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, true); + usleep_range(10, 11); + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, false); + analogix_dp_reset_aux(dp); /* Disable AUX transaction H/W retry */ @@ -1159,7 +1163,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, reg, !(reg & AUX_EN), 25, 500 * 1000); if (ret) { dev_err(dp->dev, "AUX CH enable timeout!\n"); - return -ETIMEDOUT; + goto aux_error; } /* TODO: Wait for an interrupt instead of looping? */ @@ -1168,7 +1172,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, reg, reg & RPLY_RECEIV, 10, 20 * 1000); if (ret) { dev_err(dp->dev, "AUX CH cmd reply timeout!\n"); - return -ETIMEDOUT; + goto aux_error; } /* Clear interrupt source for AUX CH command reply */ @@ -1178,7 +1182,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA); if (reg & AUX_ERR) { writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA); - return -EREMOTEIO; + goto aux_error; } /* Check AUX CH error access status */ @@ -1186,7 +1190,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, if ((reg & AUX_STATUS_MASK)) { dev_err(dp->dev, "AUX CH error happened: %d\n\n", reg & AUX_STATUS_MASK); - return -EREMOTEIO; + goto aux_error; } if (msg->request & DP_AUX_I2C_READ) { @@ -1212,4 +1216,10 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, msg->reply = DP_AUX_NATIVE_REPLY_ACK; return num_transferred > 0 ? num_transferred : -EBUSY; + +aux_error: + /* if aux err happen, reset aux */ + analogix_dp_init_aux(dp); + + return -EREMOTEIO; }