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

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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: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1480923034-21916-1-git-send-email-mika.kahola@intel.com
This commit is contained in:
Jani Nikula 2016-12-05 09:30:34 +02:00
parent 731035fe8e
commit 213e08ad60
1 changed files with 32 additions and 6 deletions
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38
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
View File

@ -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>
@ -305,19 +306,44 @@ 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,
"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_index = *data++;
gpio_number = *data++;
/* gpio source in sequence v2 only */
if (dev_priv->vbt.dsi.seq_version == 2)
@ -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;
}