[MIPI SEQ PARSING v1 PATCH 9/9] BXT GPIO support for backlight and panel control

Deepak M
2015-07-28T09:57:08Z

From: Uma Shankar <uma.shankar@intel.com>

Added the BXT GPIO pin configuration and programming logic for
backlight and panel control.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 46 ++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index c6f66e4..f27a568 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -32,6 +32,7 @@
#include <linux/slab.h>
#include <video/mipi_display.h>
#include <linux/i2c.h>
+#include <linux/gpio.h>
#include <asm/intel-mid.h>
#include <video/mipi_display.h>
#include "i915_drv.h"
@@ -325,6 +326,16 @@ out:
return data;
}

+struct bxt_gpio_table {
+ u16 gpio_pin;
+ u16 offset;
+};
+
+static struct bxt_gpio_table bxt_gtable[] = {
+ {0xC1, 270},
+ {0x1B, 456}
+};
+
static inline enum port intel_dsi_seq_port_to_port(u8 port)
{
return port ? PORT_C : PORT_A;
@@ -537,6 +548,39 @@ static int vlv_program_gpio(struct intel_dsi *intel_dsi,
return 0;
}

+static int bxt_program_gpio(struct intel_dsi *intel_dsi,
+ const u8 *data, const u8 **cur_data)
+{
+ struct drm_device *dev = intel_dsi->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u8 gpio, action;
+ u16 function;
+
+ /*
+ * Skipping the first byte as it is of no
+ * interest for android in new version
+ */
+ if (dev_priv->vbt.dsi.seq_version >= 3)
+ data++;
+
+ gpio = *data++;
+
+ /* pull up/down */
+ action = *data++;
+ function = (bxt_gtable[0].gpio_pin == gpio) ?
+ bxt_gtable[0].offset :
+ (bxt_gtable[1].gpio_pin == gpio) ?
+ bxt_gtable[1].offset : 0;
+ if (!function)
+ return -1;
+
+ gpio_request_one(function, GPIOF_DIR_OUT, "MIPI");
+ gpio_set_value(function, action);
+
+ *cur_data = data;
+ return 0;
+}
+
static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
{
struct drm_device *dev = intel_dsi->base.base.dev;
@@ -550,6 +594,8 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
ret = chv_program_gpio(intel_dsi, data, &data);
else if (IS_VALLEYVIEW(dev))
ret = vlv_program_gpio(intel_dsi, data, &data);
+ else if (IS_BROXTON(dev))
+ ret = bxt_program_gpio(intel_dsi, data, &data);
else
DRM_ERROR("GPIO programming missing for this platform.\n");