linux-kernel - Re: [PATCH V8 1/1] i2c: i2c-qcom-geni: Add shutdown callback for i2c

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Message-ID: <161052087940.3661239.14609415796697267628@swboyd.mtv.corp.google.com>
Date:   Tue, 12 Jan 2021 22:54:39 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Roja Rani Yarubandi <rojay@...eaurora.org>, wsa@...nel.org
Cc:     dianders@...omium.org, saiprakash.ranjan@...eaurora.org,
        gregkh@...uxfoundation.org, mka@...omium.org,
        akashast@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...eaurora.org, rnayak@...eaurora.org, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        sumit.semwal@...aro.org, linux-media@...r.kernel.org,
        Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: Re: [PATCH V8 1/1] i2c: i2c-qcom-geni: Add shutdown callback for i2c

Quoting Roja Rani Yarubandi (2021-01-08 07:05:45)
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index 214b4c913a13..c3f584795911 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -375,6 +375,32 @@ static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c,
>         }
>  }
>  
> +static void geni_i2c_stop_xfer(struct geni_i2c_dev *gi2c)
> +{
> +       int ret;
> +       u32 geni_status;
> +       struct i2c_msg *cur;
> +
> +       /* Resume device, as runtime suspend can happen anytime during transfer */
> +       ret = pm_runtime_get_sync(gi2c->se.dev);
> +       if (ret < 0) {
> +               dev_err(gi2c->se.dev, "Failed to resume device: %d\n", ret);
> +               return;
> +       }
> +
> +       geni_status = readl_relaxed(gi2c->se.base + SE_GENI_STATUS);
> +       if (geni_status & M_GENI_CMD_ACTIVE) {
> +               cur = gi2c->cur;

Why don't we need to hold the spinlock gi2c::lock here?

> +               geni_i2c_abort_xfer(gi2c);
> +               if (cur->flags & I2C_M_RD)
> +                       geni_i2c_rx_msg_cleanup(gi2c, cur);
> +               else
> +                       geni_i2c_tx_msg_cleanup(gi2c, cur);
> +       }
> +
> +       pm_runtime_put_sync_suspend(gi2c->se.dev);
> +}
> +
>  static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
>                                 u32 m_param)
>  {