linux-kernel - Re: [PATCH V2 3/3] thermal/int340x_thermal: Don't require IDSP to exist

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Date:   Mon, 18 May 2020 23:18:42 +0000
From:   "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:     "matthewgarrett@...gle.com" <matthewgarrett@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Aram, Nisha" <nisha.aram@...el.com>,
        "mjg59@...gle.com" <mjg59@...gle.com>
Subject: Re: [PATCH V2 3/3] thermal/int340x_thermal: Don't require IDSP to
 exist

On Mon, 2020-04-13 at 19:09 -0700, Matthew Garrett wrote:
> From: Matthew Garrett <mjg59@...gle.com>
> 
> The IDSP method doesn't appear to exist on the most recent Intel
> platforms:
> instead, the IDSP data is included in the GDDV blob. Since we
> probably don't
> want to decompress and parse that in-kernel, just allow any UUID to
> be
> written if IDSP is missing.
> 
> Signed-off-by: Matthew Garrett <mjg59@...gle.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@...ux.intel.com>

> ---
>  .../intel/int340x_thermal/int3400_thermal.c   | 30 ++++++++++++++---
> --
>  1 file changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index 3919098a73b47..19936709c2ad0 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -96,6 +96,9 @@ static ssize_t available_uuids_show(struct device
> *dev,
>  	int i;
>  	int length = 0;
>  
> +	if (!priv->uuid_bitmap)
> +		return sprintf(buf, "UNKNOWN\n");
> +
>  	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
>  		if (priv->uuid_bitmap & (1 << i))
>  			if (PAGE_SIZE - length > 0)
> @@ -113,11 +116,11 @@ static ssize_t current_uuid_show(struct device
> *dev,
>  {
>  	struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
>  
> -	if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
> -		return sprintf(buf, "%s\n",
> -			       int3400_thermal_uuids[priv-
> >current_uuid_index]);
> -	else
> +	if (priv->current_uuid_index == -1)
>  		return sprintf(buf, "INVALID\n");
> +
> +	return sprintf(buf, "%s\n",
> +		       int3400_thermal_uuids[priv-
> >current_uuid_index]);
>  }
>  
>  static ssize_t current_uuid_store(struct device *dev,
> @@ -128,9 +131,16 @@ static ssize_t current_uuid_store(struct device
> *dev,
>  	int i;
>  
>  	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
> -		if ((priv->uuid_bitmap & (1 << i)) &&
> -		    !(strncmp(buf, int3400_thermal_uuids[i],
> -			      sizeof(int3400_thermal_uuids[i]) - 1))) {
> +		if (!strncmp(buf, int3400_thermal_uuids[i],
> +			     sizeof(int3400_thermal_uuids[i]) - 1)) {
> +			/*
> +			 * If we have a list of supported UUIDs, make
> sure
> +			 * this one is supported.
> +			 */
> +			if (priv->uuid_bitmap &&
> +			    !(priv->uuid_bitmap & (1 << i)))
> +				return -EINVAL;
> +
>  			priv->current_uuid_index = i;
>  			return count;
>  		}
> @@ -462,9 +472,13 @@ static int int3400_thermal_probe(struct
> platform_device *pdev)
>  	priv->adev = adev;
>  
>  	result = int3400_thermal_get_uuids(priv);
> -	if (result)
> +
> +	/* Missing IDSP isn't fatal */
> +	if (result && result != -ENODEV)
>  		goto free_priv;
>  
> +	priv->current_uuid_index = -1;
> +
>  	result = acpi_parse_art(priv->adev->handle, &priv->art_count,
>  				&priv->arts, true);
>  	if (result)