linux-kernel - Re: [PATCH] coresight: etm4x: Set skip_power_up in etm4_init_arch

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Date: Wed, 31 Jan 2024 11:07:11 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Mao Jinlong <quic_jinlmao@...cinc.com>, Mike Leach
 <mike.leach@...aro.org>, James Clark <james.clark@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] coresight: etm4x: Set skip_power_up in
 etm4_init_arch_data function

On 31/01/2024 10:54, Mao Jinlong wrote:
> skip_power_up is used in etm4_init_arch_data when set lpoverride. So
> need to set the value of it before calling using it.

Fixes:5214b563588e ("coresight: etm4x: Add support for sysreg only 
devices")

> 
> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>

I will queue this.

Suzuki


> ---
>   drivers/hwtracing/coresight/coresight-etm4x-core.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index c5ea808ea662..8afc07d1dd23 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1200,6 +1200,7 @@ static void etm4_init_arch_data(void *info)
>   	struct etm4_init_arg *init_arg = info;
>   	struct etmv4_drvdata *drvdata;
>   	struct csdev_access *csa;
> +	struct device *dev = init_arg->dev;
>   	int i;
>   
>   	drvdata = dev_get_drvdata(init_arg->dev);
> @@ -1213,6 +1214,10 @@ static void etm4_init_arch_data(void *info)
>   	if (!etm4_init_csdev_access(drvdata, csa))
>   		return;
>   
> +	if (!csa->io_mem ||
> +	    fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
> +		drvdata->skip_power_up = true;
> +
>   	/* Detect the support for OS Lock before we actually use it */
>   	etm_detect_os_lock(drvdata, csa);
>   
> @@ -2040,11 +2045,6 @@ static int etm4_add_coresight_dev(struct etm4_init_arg *init_arg)
>   	if (!drvdata->arch)
>   		return -EINVAL;
>   
> -	/* TRCPDCR is not accessible with system instructions. */
> -	if (!desc.access.io_mem ||
> -	    fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
> -		drvdata->skip_power_up = true;
> -
>   	major = ETM_ARCH_MAJOR_VERSION(drvdata->arch);
>   	minor = ETM_ARCH_MINOR_VERSION(drvdata->arch);
>