linux-kernel - Re: [PATCH] interconnect: qcom: msm8974: Don't boost the NoC rate during boot

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Date:   Tue, 17 Nov 2020 20:22:18 +0100
From:   Luca Weiss <luca@...tu.xyz>
To:     linux-pm@...r.kernel.org, masneyb@...tation.org,
        Georgi Djakov <georgi.djakov@...aro.org>
Cc:     bjorn.andersson@...aro.org, saravanak@...gle.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Georgi Djakov <georgi.djakov@...aro.org>
Subject: Re: [PATCH] interconnect: qcom: msm8974: Don't boost the NoC rate during boot

Hi Georgi

On Montag, 9. November 2020 13:45:12 CET Georgi Djakov wrote:
> It has been reported that on Fairphone 2 (msm8974-based), increasing
> the clock rate for some of the NoCs during boot may lead to hangs.
> Let's restore the original behavior and not touch the clock rate of
> any of the NoCs to fix the regression.
> 
> Reported-by: Luca Weiss <luca@...tu.xyz>
> Fixes: b1d681d8d324 ("interconnect: Add sync state support")
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>

Tested-by: Luca Weiss <luca@...tu.xyz>

> ---
>  drivers/interconnect/qcom/msm8974.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/interconnect/qcom/msm8974.c
> b/drivers/interconnect/qcom/msm8974.c index b6b639dad691..da68ce375a89
> 100644
> --- a/drivers/interconnect/qcom/msm8974.c
> +++ b/drivers/interconnect/qcom/msm8974.c
> @@ -637,6 +637,14 @@ static int msm8974_icc_set(struct icc_node *src, struct
> icc_node *dst) return 0;
>  }
> 
> +static int msm8974_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
> +{
> +	*avg = 0;
> +	*peak = 0;
> +
> +	return 0;
> +}
> +
>  static int msm8974_icc_probe(struct platform_device *pdev)
>  {
>  	const struct msm8974_icc_desc *desc;
> @@ -690,6 +698,7 @@ static int msm8974_icc_probe(struct platform_device
> *pdev) provider->aggregate = icc_std_aggregate;
>  	provider->xlate = of_icc_xlate_onecell;
>  	provider->data = data;
> +	provider->get_bw = msm8974_get_bw;
> 
>  	ret = icc_provider_add(provider);
>  	if (ret) {

Regards
Luca