linux-kernel - [PATCH RFC] Toggle fifo write clk after ungating sdcc clk

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Date:   Thu, 20 Feb 2020 14:50:45 +0530
From:   Sayali Lokhande <sayalil@...eaurora.org>
To:     bjorn.andersson@...aro.org, adrian.hunter@...el.com,
        robh+dt@...nel.org, ulf.hansson@...aro.org,
        asutoshd@...eaurora.org, stummala@...eaurora.org,
        ppvk@...eaurora.org, rampraka@...eaurora.org,
        vbadigan@...eaurora.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, mka@...omium.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, linux-mmc-owner@...r.kernel.org,
        Sayali Lokhande <sayalil@...eaurora.org>
Subject: [PATCH RFC] Toggle fifo write clk after ungating sdcc clk

During GCC level clock gating of MCLK, the async FIFO
gets into some hang condition, such that for the next
transfer after MCLK ungating, first bit of CMD response
doesn't get written in to the FIFO. This cause the CPSM
to hang eventually leading to SW timeout.

To fix the issue, toggle the FIFO write clock after
MCLK ungated to get the FIFO pointers and flags to
valid states.

Ram Prakash Gupta (1):
  mmc: sdhci-msm: Toggle fifo write clk after ungating sdcc clk

 drivers/mmc/host/sdhci-msm.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

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