Re: [Intel-gfx] [PATCH] drm/i915/dsi: Lookup the i2c bus from ACPI NS only if CONFIG_ACPI=y (v2)

[Jani Nikula <jani.nikula@intel.com>]

On Tue, 14 Jan 2020, Vivek Kasireddy <vivek.kasireddy@intel.com> wrote:
> Perform the i2c bus/adapter lookup from ACPI Namespace only if
> ACPI is enabled in the kernel config. If ACPI is not enabled or if
> the lookup fails, we'll fallback to using the VBT for identiying
> the i2c bus.
>
> This patch
> Fixes: 8cbf89db2941 ("drm/i915/dsi: Parse the I2C element from the VBT
> MIPI sequence block (v3)")

Hrmh, please have a look at git log. Fixes: goes with the other tags
below, you don't split it across multiple lines, and you don't need to
embed it in the text.

Someone applying the patch can fix this, no need to send another
version.

> v2: Reformat the above line to clearly identify the commit this patch is
> fixing for CI (Jani)

It's not for CI, it's mostly for people. No need to send another version
to adjust that either.

BR,
Jani.

>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Nabendu Maiti <nabendu.bikash.maiti@intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Cc: Bob Paauwe <bob.j.paauwe@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 47 +++++++++++++-------
>  1 file changed, 31 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> index 89fb0d90b694..6ec35d975bd7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> +++ b/drivers/gpu/drm/i915/display/intel_dsi_vbt.c
> @@ -384,6 +384,7 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
>  	return data;
>  }
>  
> +#ifdef CONFIG_ACPI
>  static int i2c_adapter_lookup(struct acpi_resource *ares, void *data)
>  {
>  	struct i2c_adapter_lookup *lookup = data;
> @@ -413,14 +414,41 @@ static int i2c_adapter_lookup(struct acpi_resource *ares, void *data)
>  	return 1;
>  }
>  
> -static const u8 *mipi_exec_i2c(struct intel_dsi *intel_dsi, const u8 *data)
> +static void i2c_acpi_find_adapter(struct intel_dsi *intel_dsi,
> +				  const u16 slave_addr)
>  {
>  	struct drm_device *drm_dev = intel_dsi->base.base.dev;
>  	struct device *dev = &drm_dev->pdev->dev;
> -	struct i2c_adapter *adapter;
>  	struct acpi_device *acpi_dev;
>  	struct list_head resource_list;
>  	struct i2c_adapter_lookup lookup;
> +
> +	acpi_dev = ACPI_COMPANION(dev);
> +	if (acpi_dev) {
> +		memset(&lookup, 0, sizeof(lookup));
> +		lookup.slave_addr = slave_addr;
> +		lookup.intel_dsi = intel_dsi;
> +		lookup.dev_handle = acpi_device_handle(acpi_dev);
> +
> +		INIT_LIST_HEAD(&resource_list);
> +		acpi_dev_get_resources(acpi_dev, &resource_list,
> +				       i2c_adapter_lookup,
> +				       &lookup);
> +		acpi_dev_free_resource_list(&resource_list);
> +	}
> +}
> +#else
> +static inline void i2c_acpi_find_adapter(struct intel_dsi *intel_dsi,
> +					 const u16 slave_addr)
> +{
> +}
> +#endif
> +
> +static const u8 *mipi_exec_i2c(struct intel_dsi *intel_dsi, const u8 *data)
> +{
> +	struct drm_device *drm_dev = intel_dsi->base.base.dev;
> +	struct device *dev = &drm_dev->pdev->dev;
> +	struct i2c_adapter *adapter;
>  	struct i2c_msg msg;
>  	int ret;
>  	u8 vbt_i2c_bus_num = *(data + 2);
> @@ -431,20 +459,7 @@ static const u8 *mipi_exec_i2c(struct intel_dsi *intel_dsi, const u8 *data)
>  
>  	if (intel_dsi->i2c_bus_num < 0) {
>  		intel_dsi->i2c_bus_num = vbt_i2c_bus_num;
> -
> -		acpi_dev = ACPI_COMPANION(dev);
> -		if (acpi_dev) {
> -			memset(&lookup, 0, sizeof(lookup));
> -			lookup.slave_addr = slave_addr;
> -			lookup.intel_dsi = intel_dsi;
> -			lookup.dev_handle = acpi_device_handle(acpi_dev);
> -
> -			INIT_LIST_HEAD(&resource_list);
> -			acpi_dev_get_resources(acpi_dev, &resource_list,
> -					       i2c_adapter_lookup,
> -					       &lookup);
> -			acpi_dev_free_resource_list(&resource_list);
> -		}
> +		i2c_acpi_find_adapter(intel_dsi, slave_addr);
>  	}
>  
>  	adapter = i2c_get_adapter(intel_dsi->i2c_bus_num);

-- 
Jani Nikula, Intel Open Source Graphics Center
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