Linux v5.3.6
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From patchwork Thu Sep 5 19:24:12 2019
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Thu, 05 Sep 2019 12:24:14 -0700 (PDT)
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From: Lee Jones <lee.jones@linaro.org>
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To: alokc@codeaurora.org, agross@kernel.org, robh+dt@kernel.org,
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mark.rutland@arm.com, bjorn.andersson@linaro.org, vkoul@kernel.org,
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wsa@the-dreams.de
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Cc: linux-i2c@vger.kernel.org, linux-arm-msm@vger.kernel.org,
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devicetree@vger.kernel.org, Lee Jones <lee.jones@linaro.org>
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Subject: [RESEND v3 1/1] i2c: qcom-geni: Disable DMA processing on the Lenovo
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Yoga C630
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Date: Thu, 5 Sep 2019 20:24:12 +0100
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Message-Id: <20190905192412.23116-1-lee.jones@linaro.org>
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X-Mailing-List: linux-arm-msm@vger.kernel.org
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We have a production-level laptop (Lenovo Yoga C630) which is exhibiting
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a rather horrific bug. When I2C HID devices are being scanned for at
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boot-time the QCom Geni based I2C (Serial Engine) attempts to use DMA.
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When it does, the laptop reboots and the user never sees the OS.
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Attempts are being made to debug the reason for the spontaneous reboot.
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No luck so far, hence the requirement for this hot-fix. This workaround
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will be removed once we have a viable fix.
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Signed-off-by: Lee Jones <lee.jones@linaro.org>
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---
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drivers/i2c/busses/i2c-qcom-geni.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
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index a89bfce5388e..17abf60c94ae 100644
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--- a/drivers/i2c/busses/i2c-qcom-geni.c
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+++ b/drivers/i2c/busses/i2c-qcom-geni.c
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@@ -355,11 +355,13 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
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{
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dma_addr_t rx_dma;
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unsigned long time_left;
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- void *dma_buf;
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+ void *dma_buf = NULL;
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struct geni_se *se = &gi2c->se;
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size_t len = msg->len;
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- dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
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+ if (!of_machine_is_compatible("lenovo,yoga-c630"))
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+ dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
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+
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if (dma_buf)
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geni_se_select_mode(se, GENI_SE_DMA);
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else
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@@ -394,11 +396,13 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
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{
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dma_addr_t tx_dma;
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unsigned long time_left;
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- void *dma_buf;
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+ void *dma_buf = NULL;
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struct geni_se *se = &gi2c->se;
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size_t len = msg->len;
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- dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
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+ if (!of_machine_is_compatible("lenovo,yoga-c630"))
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+ dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
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+
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if (dma_buf)
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geni_se_select_mode(se, GENI_SE_DMA);
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else
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@ -56,7 +56,7 @@ Summary: The Linux kernel
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%if 0%{?released_kernel}
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# Do we have a -stable update to apply?
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%define stable_update 5
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%define stable_update 6
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# Set rpm version accordingly
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%if 0%{?stable_update}
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%define stablerev %{stable_update}
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@ -571,8 +571,6 @@ Patch323: gpio-max77620-Use-correct-unit-for-debounce-times.patch
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Patch325: arm64-tegra186-enable-USB-on-Jetson-TX2.patch
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# QCom laptop bits
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# https://patchwork.kernel.org/patch/11133827/
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Patch330: arm64-qcom-i2c-geni-Disable-DMA-processing-on-the-Lenovo-Yoga-C630.patch
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# https://patchwork.kernel.org/patch/11133293/
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Patch332: arm64-dts-qcom-Add-Lenovo-Yoga-C630.patch
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@ -1812,6 +1810,9 @@ fi
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#
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#
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%changelog
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* Mon Oct 14 2019 Laura Abbott <labbott@redhat.com> - 5.3.6-300
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- Linux v5.3.6
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* Fri Oct 11 2019 Laura Abbott <labbott@redhat.com>
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- Fix disappearing cursor issue (rhbz 1738614)
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2
sources
2
sources
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@ -1,2 +1,2 @@
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SHA512 (linux-5.3.tar.xz) = 6b5edef47c319a3fa7f6c20a3e0903a5acd89ec75e32dc5f99adcb60c9fe118ea312722d9c3d27e2e3900afa2455afb86e83a8b6bb131009bc79ddbe6fb0595d
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SHA512 (patch-5.3.5.xz) = 70555da6275237bd6fe0514e2e49052f36af87fbae4919a464285dcdc9b84443995264762248496e44291800b2398a45bcf3fa3459a631f162cfdd915b972d9f
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SHA512 (patch-5.3.6.xz) = 71ee140d7650189dcc824eb962e78b6f3d790369376b9b32d41babd55f57240ea5620bbeeef62164d0436e857ca772706d6b9202bac94c7ecbce78c3fd9860d2
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