From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Douglas Anderson <dianders@chromium.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Wolfram Sang <wsa@kernel.org>,
Akash Asthana <akashast@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
linux-i2c@vger.kernel.org, Andy Gross <agross@kernel.org>,
Girish Mahadevan <girishm@codeaurora.org>,
Karthikeyan Ramasubramanian <kramasub@codeaurora.org>,
Mukesh Kumar Savaliya <msavaliy@codeaurora.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] i2c: i2c-qcom-geni: More properly fix the DMA race
Date: Sat, 10 Oct 2020 16:16:48 +0300 [thread overview]
Message-ID: <4dcdc8b3-94aa-8e68-934d-70542897db6a@linaro.org> (raw)
In-Reply-To: <20201008225235.2035820-1-dianders@chromium.org>
On 09/10/2020 01:52, Douglas Anderson wrote:
> Previously I landed commit 02b9aec59243 ("i2c: i2c-qcom-geni: Fix DMA
> transfer race") to fix a race we were seeing. While that most
> definitely fixed the race we were seeing, it looks like it causes
> problems in the TX path, which we didn't stress test until we started
> trying to update firmware on devices.
>
> Let's revert that patch and try another way: fix the original problem
> by disabling the interrupts that aren't relevant to DMA transfers.
> Now we can stress both TX and RX cases and see no problems. I also
> can't find any place to put an msleep() that causes problems anymore.
>
> Since this problem only affects i2c, I'm hoping for an Ack from Bjorn
> and then all these patches can go through the i2c tree. However, if
> maintainers want to work a different way out to land that's OK too.
These patches fix I2C DMA issues on SM8250 we were observing
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
--
With best wishes
Dmitry
prev parent reply other threads:[~2020-10-10 22:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 22:52 [PATCH 0/3] i2c: i2c-qcom-geni: More properly fix the DMA race Douglas Anderson
2020-10-08 22:52 ` [PATCH 1/3] soc: qcom: geni: More properly switch to DMA mode Douglas Anderson
2020-10-10 0:39 ` Stephen Boyd
2020-10-12 9:05 ` Akash Asthana
2020-10-13 21:35 ` Doug Anderson
2020-10-12 8:09 ` Akash Asthana
2020-10-08 22:52 ` [PATCH 2/3] Revert "i2c: i2c-qcom-geni: Fix DMA transfer race" Douglas Anderson
2020-10-10 0:39 ` Stephen Boyd
2020-10-12 8:12 ` Akash Asthana
2020-10-08 22:52 ` [PATCH 3/3] soc: qcom: geni: Optimize select fifo/dma mode Douglas Anderson
2020-10-10 0:32 ` Stephen Boyd
2020-10-13 21:38 ` Doug Anderson
2020-10-10 0:26 ` [PATCH 0/3] i2c: i2c-qcom-geni: More properly fix the DMA race Stephen Boyd
2020-10-10 13:16 ` Dmitry Baryshkov [this message]
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