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Commit 213e08ad authored by Jani Nikula's avatar Jani Nikula
Browse files

drm/i915/bxt: add bxt dsi gpio element support 



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.

v2 by Mika: switch *NULL* to *"panel"* when requesting gpio for MIPI/DSI
panel.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarMika Kahola <mika.kahola@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1480923034-21916-1-git-send-email-mika.kahola@intel.com
parent 731035fe

drivers/gpu/drm/i915/intel_dsi_panel_vbt.c

+32 −6
Original line number Diff line number Diff line
@@ -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>
@@ -305,20 +306,45 @@ 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,

						 "panel", gpio_index,

						 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_number = *data++;



	/* gpio source in sequence v2 only */

	if (dev_priv->vbt.dsi.seq_version == 2)

		gpio_source = (*data >> 1) & 3;
@@ -329,11 +355,11 @@ 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;

}