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SubjectRe: [PATCH V2 3/3] thermal/int340x_thermal: Don't require IDSP to exist
Date
On Mon, 2020-04-13 at 19:09 -0700, Matthew Garrett wrote:
> From: Matthew Garrett <mjg59@google.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@google.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@linux.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)
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