diff options
Diffstat (limited to 'arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch')
-rw-r--r-- | arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch b/arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch new file mode 100644 index 000000000..a7f7c8f20 --- /dev/null +++ b/arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch @@ -0,0 +1,128 @@ +From patchwork Thu Sep 5 19:24:12 2019 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +X-Patchwork-Submitter: Lee Jones <lee.jones@linaro.org> +X-Patchwork-Id: 11133827 +Return-Path: <SRS0=OmJI=XA=vger.kernel.org=linux-arm-msm-owner@kernel.org> +Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org + [172.30.200.123]) + by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DDFD514ED + for <patchwork-linux-arm-msm@patchwork.kernel.org>; + Thu, 5 Sep 2019 19:24:19 +0000 (UTC) +Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) + by mail.kernel.org (Postfix) with ESMTP id D540020870 + for <patchwork-linux-arm-msm@patchwork.kernel.org>; + Thu, 5 Sep 2019 19:24:19 +0000 (UTC) +Authentication-Results: mail.kernel.org; + dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org + header.b="j/6kUy9p" +Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand + id S1727540AbfIETYS (ORCPT + <rfc822;patchwork-linux-arm-msm@patchwork.kernel.org>); + Thu, 5 Sep 2019 15:24:18 -0400 +Received: from mail-wr1-f49.google.com ([209.85.221.49]:36821 "EHLO + mail-wr1-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org + with ESMTP id S1726008AbfIETYS (ORCPT + <rfc822;linux-arm-msm@vger.kernel.org>); + Thu, 5 Sep 2019 15:24:18 -0400 +Received: by mail-wr1-f49.google.com with SMTP id y19so4081592wrd.3 + for <linux-arm-msm@vger.kernel.org>; + Thu, 05 Sep 2019 12:24:16 -0700 (PDT) +DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; + d=linaro.org; s=google; + h=from:to:cc:subject:date:message-id; + bh=19vbMBbLeKgWt8VsEseKuJu+9+rmeS/Lh0ZhXOFWQYc=; + b=j/6kUy9psCaV+YLvz8j0kAZ3/WrmOU3xyh5rDOj0TwK0TnwjLtaLil9Q+C9KpFvvVG + h4R8p4cZFB0U4b/PAfc9Xt4p4xJNkAIpTzL4QRjM+nkXdDcYyiwUGkr9BRJnJmO0lyZB + zmylqwjRd1oOrTQ1tPvwqUV3OUR5u6WA+rDyhn+A516vskkns0bEICMG787HdDEwjigd + +3SR4L9u7swSDpNhqxtfPsn9UFP36sehUfgx32xUcjUhX3ls4RtX+6HCZU+rkeQuILt5 + 0qlmqliIuKXWkQe+ii/gtrK+ulFQ7lEl76YfDJyqXVo4Z357rIhVFAz+mooVn5qpscmU + E+xA== +X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; + d=1e100.net; s=20161025; + h=x-gm-message-state:from:to:cc:subject:date:message-id; + bh=19vbMBbLeKgWt8VsEseKuJu+9+rmeS/Lh0ZhXOFWQYc=; + b=QjFuCunKeBkoabY9fIsWTo3krapsS69k52eNtOIeLBaCd7M1lvCmItn41DcbJ5ykqT + RQ0rnlNq35x9QvKNumPai3fMZp9AWt3KpJpxbpEokltyLbkGUqRWaeYTrOtuV9P9nRmT + Yj72UBVzYj4d/G+FGq8EBesWjRyEFC51+RekvPlbRZ/h1fVW7/XAy5cO1ywnHrtNe8pQ + 7gYQJ3Xh1Y09qkiO0i8iru5PSMTK3U+vPSLWVdFOeqMh+Beins6I9mbKf+UX+xa8ECK3 + mEFjYxY57YVx+SpaKrmBwEmu9YXLgXqEif1OH1FHFiKZVQ4ABPp19D4+5JOXEV1tCwUS + B6Qw== +X-Gm-Message-State: APjAAAUM7yEkrkGZ+mbleFtCMQGsXfLQSXt2Bd+K6leuP2oAs8Vj1j9k + 4bsoJvF042q/z9+6bnLlGShjoA== +X-Google-Smtp-Source: + APXvYqyThx0kWliMdrjc7dedZ/+AhabFi7TIc04exnxhWAEkAOh7foRP8Cz8ZjjhxGJCvUyUPA4lFg== +X-Received: by 2002:adf:ea0c:: with SMTP id q12mr4172788wrm.172.1567711455933; + Thu, 05 Sep 2019 12:24:15 -0700 (PDT) +Received: from localhost.localdomain ([95.147.198.36]) + by smtp.gmail.com with ESMTPSA id + q24sm7942378wmc.3.2019.09.05.12.24.14 + (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); + Thu, 05 Sep 2019 12:24:14 -0700 (PDT) +From: Lee Jones <lee.jones@linaro.org> +To: alokc@codeaurora.org, agross@kernel.org, robh+dt@kernel.org, + mark.rutland@arm.com, bjorn.andersson@linaro.org, vkoul@kernel.org, + wsa@the-dreams.de +Cc: linux-i2c@vger.kernel.org, linux-arm-msm@vger.kernel.org, + devicetree@vger.kernel.org, Lee Jones <lee.jones@linaro.org> +Subject: [RESEND v3 1/1] i2c: qcom-geni: Disable DMA processing on the Lenovo + Yoga C630 +Date: Thu, 5 Sep 2019 20:24:12 +0100 +Message-Id: <20190905192412.23116-1-lee.jones@linaro.org> +X-Mailer: git-send-email 2.17.1 +Sender: linux-arm-msm-owner@vger.kernel.org +Precedence: bulk +List-ID: <linux-arm-msm.vger.kernel.org> +X-Mailing-List: linux-arm-msm@vger.kernel.org + +We have a production-level laptop (Lenovo Yoga C630) which is exhibiting +a rather horrific bug. When I2C HID devices are being scanned for at +boot-time the QCom Geni based I2C (Serial Engine) attempts to use DMA. +When it does, the laptop reboots and the user never sees the OS. + +Attempts are being made to debug the reason for the spontaneous reboot. +No luck so far, hence the requirement for this hot-fix. This workaround +will be removed once we have a viable fix. + +Signed-off-by: Lee Jones <lee.jones@linaro.org> +--- + drivers/i2c/busses/i2c-qcom-geni.c | 12 ++++++++---- + 1 file changed, 8 insertions(+), 4 deletions(-) + +diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c +index a89bfce5388e..17abf60c94ae 100644 +--- a/drivers/i2c/busses/i2c-qcom-geni.c ++++ b/drivers/i2c/busses/i2c-qcom-geni.c +@@ -355,11 +355,13 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, + { + dma_addr_t rx_dma; + unsigned long time_left; +- void *dma_buf; ++ void *dma_buf = NULL; + struct geni_se *se = &gi2c->se; + size_t len = msg->len; + +- dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); ++ if (!of_machine_is_compatible("lenovo,yoga-c630")) ++ dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); ++ + if (dma_buf) + geni_se_select_mode(se, GENI_SE_DMA); + else +@@ -394,11 +396,13 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, + { + dma_addr_t tx_dma; + unsigned long time_left; +- void *dma_buf; ++ void *dma_buf = NULL; + struct geni_se *se = &gi2c->se; + size_t len = msg->len; + +- dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); ++ if (!of_machine_is_compatible("lenovo,yoga-c630")) ++ dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); ++ + if (dma_buf) + geni_se_select_mode(se, GENI_SE_DMA); + else |