LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Sibi Sankar <sibis@codeaurora.org>
Cc: evgreen@chromium.org, p.zabel@pengutronix.de, ohad@wizery.com,
	linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org,
	linux-kernel@vger.kernel.org, agross@kernel.org
Subject: Re: [PATCH 1/4] remoteproc: qcom: q6v5-mss: Use regmap_read_poll_timeout
Date: Mon, 20 Jan 2020 11:24:32 -0800
Message-ID: <20200120192432.GJ1511@yoga> (raw)
In-Reply-To: <20200117135130.3605-2-sibis@codeaurora.org>

On Fri 17 Jan 05:51 PST 2020, Sibi Sankar wrote:

> Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.
> 

Nice, but we should be able to do the same in q6v5proc_halt_axi_port()?

> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 51f451311f5fc..f20b39c6ff0ed 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -73,6 +73,7 @@
>  #define NAV_AXI_IDLE_BIT		BIT(2)
>  
>  #define HALT_ACK_TIMEOUT_MS		100
> +#define NAV_HALT_ACK_TIMEOUT_US		200
>  
>  /* QDSP6SS_RESET */
>  #define Q6SS_STOP_CORE			BIT(0)
> @@ -746,7 +747,6 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  				       struct regmap *halt_map,
>  				       u32 offset)
>  {
> -	unsigned long timeout;
>  	unsigned int val;
>  	int ret;
>  
> @@ -760,15 +760,11 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  			   NAV_AXI_HALTREQ_BIT);
>  
>  	/* Wait for halt ack*/
> -	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
> -	for (;;) {
> -		ret = regmap_read(halt_map, offset, &val);
> -		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
> -		    time_after(jiffies, timeout))
> -			break;
> -
> -		udelay(5);
> -	}
> +	ret = regmap_read_poll_timeout(halt_map, offset, val,
> +				       (val & NAV_AXI_HALTACK_BIT),
> +				       5, NAV_HALT_ACK_TIMEOUT_US);
> +	if (ret)
> +		dev_err(qproc->dev, "nav halt ack timeout\n");

Is there a case where this new print adds value beyond the printout we
already have for the case of IDLE_BIT not going high? Can we simply
ignore the return value and skip the print?

Regards,
Bjorn

>  
>  	ret = regmap_read(halt_map, offset, &val);
>  	if (ret || !(val & NAV_AXI_IDLE_BIT))
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-17 13:51 [PATCH 0/4] Improve general readability of MSS on SC7180 Sibi Sankar
2020-01-17 13:51 ` [PATCH 1/4] remoteproc: qcom: q6v5-mss: Use regmap_read_poll_timeout Sibi Sankar
2020-01-17 14:19   ` Philipp Zabel
2020-01-20 19:24   ` Bjorn Andersson [this message]
2020-01-22  6:18     ` Sibi Sankar
2020-01-17 13:51 ` [PATCH 2/4] remoteproc: qcom: q6v5-mss: Improve readability across clk handling Sibi Sankar
2020-01-21 19:22   ` Evan Green
2020-01-22  6:38     ` Sibi Sankar
2020-01-17 13:51 ` [PATCH 3/4] remoteproc: qcom: q6v5-mss: Rename boot status timeout Sibi Sankar
2020-01-21 19:22   ` Evan Green
2020-01-17 13:51 ` [PATCH 4/4] remoteproc: qcom: q6v5-mss: Improve readability of reset_assert Sibi Sankar
2020-01-20 19:36   ` Bjorn Andersson
2020-01-20 19:37 ` [PATCH 0/4] Improve general readability of MSS on SC7180 Bjorn Andersson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200120192432.GJ1511@yoga \
    --to=bjorn.andersson@linaro.org \
    --cc=agross@kernel.org \
    --cc=evgreen@chromium.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-remoteproc@vger.kernel.org \
    --cc=ohad@wizery.com \
    --cc=p.zabel@pengutronix.de \
    --cc=sibis@codeaurora.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git