Re: [PATCH alternative #1] drm/i915/bxt: add bxt dsi gpio element support

[Mika Kahola <mika.kahola@intel.com>]

On Tue, 2016-11-15 at 14:08 +0200, Jani Nikula wrote:
> Request the GPIO by index through the consumer API. For now, use a
> quick
> hack to store the already requested ones, simply because I have no
> idea
> whether this actually works or not, and I have no way to test it.
> 
> Cc: Mika Kahola <mika.kahola@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 38
> +++++++++++++++++++++++++-----
>  1 file changed, 32 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> index 9f279a3d0f74..41e0eeac97f4 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> @@ -29,6 +29,7 @@
>  #include <drm/drm_edid.h>
>  #include <drm/i915_drm.h>
>  #include <drm/drm_panel.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/slab.h>
>  #include <video/mipi_display.h>
>  #include <asm/intel-mid.h>
> @@ -304,19 +305,44 @@ static void chv_exec_gpio(struct
> drm_i915_private *dev_priv,
>  	mutex_unlock(&dev_priv->sb_lock);
>  }
>  
> +static void bxt_exec_gpio(struct drm_i915_private *dev_priv,
> +			  u8 gpio_source, u8 gpio_index, bool value)
> +{
> +	/* XXX: this table is a quick ugly hack. */
> +	static struct gpio_desc *bxt_gpio_table[U8_MAX + 1];
> +	struct gpio_desc *gpio_desc = bxt_gpio_table[gpio_index];
> +
> +	if (!gpio_desc) {
> +		gpio_desc = devm_gpiod_get_index(dev_priv->drm.dev,
> +						 NULL, gpio_index,
This patch works better with *NULL* replaced by *"panel"*. With this
change we can access GPIO's without GPIO index request failures.

> +						 value ?
> GPIOD_OUT_LOW :
> +						 GPIOD_OUT_HIGH);
> +
> +		if (IS_ERR_OR_NULL(gpio_desc)) {
> +			DRM_ERROR("GPIO index %u request failed
> (%ld)\n",
> +				  gpio_index, PTR_ERR(gpio_desc));
> +			return;
> +		}
> +
> +		bxt_gpio_table[gpio_index] = gpio_desc;
> +	}
> +
> +	gpiod_set_value(gpio_desc, value);
> +}
> +
>  static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const
> u8 *data)
>  {
>  	struct drm_device *dev = intel_dsi->base.base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
> -	u8 gpio_source, gpio_index;
> +	u8 gpio_source, gpio_index = 0, gpio_number;
>  	bool value;
>  
>  	DRM_DEBUG_KMS("\n");
>  
>  	if (dev_priv->vbt.dsi.seq_version >= 3)
> -		data++;
> +		gpio_index = *data++;
>  
> -	gpio_index = *data++;
> +	gpio_number = *data++;
>  
>  	/* gpio source in sequence v2 only */
>  	if (dev_priv->vbt.dsi.seq_version == 2)
> @@ -328,11 +354,11 @@ static const u8 *mipi_exec_gpio(struct
> intel_dsi *intel_dsi, const u8 *data)
>  	value = *data++ & 1;
>  
>  	if (IS_VALLEYVIEW(dev_priv))
> -		vlv_exec_gpio(dev_priv, gpio_source, gpio_index,
> value);
> +		vlv_exec_gpio(dev_priv, gpio_source, gpio_number,
> value);
>  	else if (IS_CHERRYVIEW(dev_priv))
> -		chv_exec_gpio(dev_priv, gpio_source, gpio_index,
> value);
> +		chv_exec_gpio(dev_priv, gpio_source, gpio_number,
> value);
>  	else
> -		DRM_DEBUG_KMS("GPIO element not supported on this
> platform\n");
> +		bxt_exec_gpio(dev_priv, gpio_source, gpio_index,
> value);
>  
>  	return data;
>  }
-- 
Mika Kahola - Intel OTC

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