[Intel-gfx] [Generic GPIO patch 3/3] drm/i915: BXT GPIO support for backlight and panel control

[Deepak M]

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

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

Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Uma Shankar <uma.shankar at 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 7fd1fae..c6e18fe 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 <asm/intel-mid.h>
+#include <linux/gpio.h>
 #include <video/mipi_display.h>
 #include "i915_drv.h"
 #include "intel_drv.h"
@@ -593,6 +594,16 @@ static struct gpio_table gtable[] = {
 	{ VLV_USB_ULPI_0_REFCLK_GPIOS_43_PCONF0, VLV_USB_ULPI_0_REFCLK_GPIOS_43_PAD, 0}
 };
 
+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;
@@ -812,6 +823,39 @@ out:
 	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;
@@ -825,6 +869,8 @@ 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");
 
-- 
1.9.1