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: 10358795 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 A8F9E602D6 for ; Tue, 24 Apr 2018 07:36:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 99EB428D1D for ; Tue, 24 Apr 2018 07:36:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8E96228D22; Tue, 24 Apr 2018 07:36:48 +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=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1245D28D1D for ; Tue, 24 Apr 2018 07:36:48 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7956B6E372; Tue, 24 Apr 2018 07:35:16 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by gabe.freedesktop.org (Postfix) with ESMTPS id BEE4D895F5 for ; Mon, 23 Apr 2018 10:50:42 +0000 (UTC) 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-Mailman-Approved-At: Tue, 24 Apr 2018 07:34:39 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Laurent.pinchart@ideasonboard.com, kernel@collabora.com, m.szyprowski@samsung.com, linux-samsung-soc@vger.kernel.org, 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 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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; }