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From: Maulik Shah <mkshah@codeaurora.org>
To: Douglas Anderson <dianders@chromium.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: mka@chromium.org, Rajendra Nayak <rnayak@codeaurora.org>,
	evgreen@chromium.org, Lina Iyer <ilina@codeaurora.org>,
	swboyd@chromium.org, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFT PATCH v2 07/10] drivers: qcom: rpmh-rsc: Warning if tcs_write() used for non-active
Date: Wed, 1 Apr 2020 18:10:18 +0530
Message-ID: <339a7a7b-af4e-d6a9-4b48-2a603ea10172@codeaurora.org> (raw)
In-Reply-To: <20200311161104.RFT.v2.7.I8e187cdfb7a31f5bb7724f1f937f2862ee464a35@changeid>

Hi,

On 3/12/2020 4:43 AM, Douglas Anderson wrote:
> tcs_write() is documented to only be useful for writing
> RPMH_ACTIVE_ONLY_STATE.  Let's be loud if someone messes up.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>
> Changes in v2: None
>
>   drivers/soc/qcom/rpmh-rsc.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index 93f5d1fb71ca..ba489d18c20e 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -573,6 +573,12 @@ static int tcs_write(struct rsc_drv *drv, const struct tcs_request *msg)
>   	unsigned long flags;
>   	int ret;
>   
> +	/*
> +	 * It only makes sense to grab a whole TCS for ourselves if we're
> +	 * triggering right away, which we only do for ACTIVE_ONLY.
> +	 */
> +	WARN_ON(msg->state != RPMH_ACTIVE_ONLY_STATE);
> +

Unnecessary check, we will never hit this warning. Lets not add such check.

Saying that you can modify this change to drop below check  from 
rpmh_rsc_write_ctrl_data() as that never hit.

         /* Data sent to this API will not be sent immediately */
         if (msg->state == RPMH_ACTIVE_ONLY_STATE)
                 return -EINVAL;

we always call rpmh_rsc_write_ctrl_data() for RPMH_SLEEP_STATE and 
RPMH_WAKE_ONLY_STATE.

Thanks,
Maulik
>   	/* TODO: get_tcs_for_msg() can return -EAGAIN and nobody handles */
>   	tcs = get_tcs_for_msg(drv, msg);
>   	if (IS_ERR(tcs))

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 23:13 [RFT PATCH v2 00/10] drivers: qcom: rpmh-rsc: Cleanup / add lots of comments Douglas Anderson
2020-03-11 23:13 ` [RFT PATCH v2 01/10] drivers: qcom: rpmh-rsc: Clean code reading/writing regs/cmds Douglas Anderson
2020-04-01  8:12   ` Maulik Shah
2020-03-11 23:13 ` [RFT PATCH v2 02/10] drivers: qcom: rpmh-rsc: Document the register layout better Douglas Anderson
2020-04-01  8:14   ` Maulik Shah
2020-04-02 20:15     ` Doug Anderson
2020-03-11 23:13 ` [RFT PATCH v2 03/10] drivers: qcom: rpmh-rsc: Fold tcs_ctrl_write() into its single caller Douglas Anderson
2020-04-01  8:17   ` Maulik Shah
2020-03-11 23:13 ` [RFT PATCH v2 04/10] drivers: qcom: rpmh-rsc: Remove get_tcs_of_type() abstraction Douglas Anderson
2020-04-01  8:18   ` Maulik Shah
2020-03-11 23:13 ` [RFT PATCH v2 05/10] drivers: qcom: rpmh-rsc: A lot of comments Douglas Anderson
2020-04-01 11:29   ` Maulik Shah
2020-04-02 20:18     ` Doug Anderson
2020-04-08 11:10       ` Maulik Shah
2020-03-11 23:13 ` [RFT PATCH v2 06/10] drivers: qcom: rpmh-rsc: Comment tcs_is_free() + warn if state mismatch Douglas Anderson
2020-04-01 11:38   ` Maulik Shah
2020-04-02 20:19     ` Doug Anderson
2020-03-11 23:13 ` [RFT PATCH v2 07/10] drivers: qcom: rpmh-rsc: Warning if tcs_write() used for non-active Douglas Anderson
2020-04-01 12:40   ` Maulik Shah [this message]
2020-04-02 20:19     ` Doug Anderson
2020-03-11 23:13 ` [RFT PATCH v2 08/10] drivers: qcom: rpmh-rsc: spin_lock_irqsave() for tcs_invalidate() Douglas Anderson
2020-03-26 21:44   ` Doug Anderson
2020-03-11 23:13 ` [RFT PATCH v2 09/10] drivers: qcom: rpmh-rsc: Kill cmd_cache and find_match() with fire Douglas Anderson
2020-03-11 23:13 ` [RFT PATCH v2 10/10] drivers: qcom: rpmh-rsc: Always use -EAGAIN, never -EBUSY Douglas Anderson

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