linux-kernel - Re: [PATCH] remoteproc: qcom: q6v5-pil: fix modem hang on SDM845 after axis2 clk unvote

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Date:   Tue, 10 Jul 2018 14:09:31 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ohad@...ery.com, kyan@...eaurora.org, sricharan@...eaurora.org,
        akdwived@...eaurora.org, linux-arm-msm@...r.kernel.org,
        tsoni@...eaurora.org
Subject: Re: [PATCH] remoteproc: qcom: q6v5-pil: fix modem hang on SDM845
 after axis2 clk unvote

On Mon 09 Jul 08:12 PDT 2018, Sibi Sankar wrote:

> GCC_MSS_AXIS2 clock is used for disabling boot IMEM (a part of
> AP boot up). With Boot IMEM disable now a part TZ/ATF, AXIS2
> clock is no longer required post AP boot up and expected to
> remain untouched. However if the clock is turned ON after Q6
> is brought out of reset and later turned off, it results in
> modem hang. When Q6 attempts a power collapse the internal
> handshaking to check if AXIS2 is idle never goes through since
> it is turned off preventing the RSC from getting triggered,
> leaving modem in a funky state. Hence removing AXIS2 clk
> enable/disable from the driver.
> 
> [bjorn: identified unvoting axis2 clk caused modem hang]
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>

Thanks Sibi

Regards,
Bjorn

> ---
>  drivers/remoteproc/qcom_q6v5_pil.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
> index e04319573c91..d7a4b9eca5d2 100644
> --- a/drivers/remoteproc/qcom_q6v5_pil.c
> +++ b/drivers/remoteproc/qcom_q6v5_pil.c
> @@ -1243,7 +1243,6 @@ static const struct rproc_hexagon_res sdm845_mss = {
>  	.hexagon_mba_image = "mba.mbn",
>  	.proxy_clk_names = (char*[]){
>  			"xo",
> -			"axis2",
>  			"prng",
>  			NULL
>  	},
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>