[PATCH v4 4/4] drm/i915/bxt: add bxt dsi gpio element support

Jani Nikula
2016-04-07T14:26:58Z

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.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index b7772ff892e7..3ec8005ef84f 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.h>
#include <linux/slab.h>
#include <video/mipi_display.h>
#include <asm/intel-mid.h>
@@ -295,6 +296,31 @@ 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->dev->dev,
+ NULL, 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;
@@ -321,7 +347,7 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
else if (IS_CHERRYVIEW(dev_priv))
chv_exec_gpio(dev_priv, gpio_source, gpio_index, 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;
}