[Intel-gfx] [PATCH 5/8] drm/i915: VBT Parsing for the PSR Feature Block for HSW

[Rodrigo Vivi]

From: Shobhit Kumar <shobhit.kumar at intel.com>

Parse and store useful information in i915_dev_private

Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  8 ++++++++
 drivers/gpu/drm/i915/intel_bios.c | 30 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_bios.h | 20 +++++++++++++++++++-
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d2b93a4..6cb3439 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -751,6 +751,14 @@ typedef struct drm_i915_private {
 	} edp;
 	bool no_aux_handshake;
 
+
+	/* PSR related info from VBT */
+	u8 full_link_state;
+	u8 wait_lines;
+	u8 idle_frames;
+	u16 wakeup_tp1;
+	u16 wakeup_tp2_tp3;
+
 	int crt_ddc_pin;
 	struct drm_i915_fence_reg fence_regs[I915_MAX_NUM_FENCES]; /* assume 965 */
 	int fence_reg_start; /* 4 if userland hasn't ioctl'd us yet */
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 87e9b92..a5fa3c4 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -381,6 +381,35 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
 	}
 }
 
+
+static void
+parse_edp_psr(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+{
+	struct bdb_psr_features *psr;
+	struct bdb_lvds_options *lvds_opts;
+	int index = 0;
+	lvds_opts = find_section(bdb, BDB_LVDS_OPTIONS);
+	if (!lvds_opts) {
+		DRM_DEBUG_KMS("No LVDS Options block found.\n");
+		return;
+	}
+
+	index = lvds_opts->panel_type;
+
+	psr = find_section(bdb, BDB_PSR_FEATURES);
+	if (!psr) {
+		DRM_DEBUG_KMS("No PSR feature block found.\n");
+		return;
+	}
+
+	dev_priv->full_link_state = psr[index].link_disable;
+	dev_priv->wait_lines = psr[index].wait_lines;
+	dev_priv->idle_frames = psr[index].idle_frames;
+	dev_priv->wakeup_tp1 = psr[index].wakeup_tp1;
+	dev_priv->wakeup_tp2_tp3 = psr[index].wakeup_tp2;
+}
+
+
 static void
 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 			  struct bdb_header *bdb)
@@ -747,6 +776,7 @@ intel_parse_bios(struct drm_device *dev)
 	parse_device_mapping(dev_priv, bdb);
 	parse_driver_features(dev_priv, bdb);
 	parse_edp(dev_priv, bdb);
+	parse_edp_psr(dev_priv, bdb);
 
 	if (bios)
 		pci_unmap_rom(pdev, bios);
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index 36e57f9..c1d39de 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -80,7 +80,7 @@ struct vbios_data {
 #define BDB_EXT_MMIO_REGS	  6
 #define BDB_SWF_IO		  7
 #define BDB_SWF_MMIO		  8
-#define BDB_DOT_CLOCK_TABLE	  9
+#define BDB_PSR_FEATURES	  9
 #define BDB_MODE_REMOVAL_TABLE	 10
 #define BDB_CHILD_DEVICE_TABLE	 11
 #define BDB_DRIVER_FEATURES	 12
@@ -263,6 +263,24 @@ struct bdb_lvds_options {
 	u8 rsvd4;
 } __attribute__((packed));
 
+struct bdb_psr_features {
+	/* psr_enable byte */
+	u8 link_disable:1;
+	u8 require_aux:1;
+	u8 rsvd1:6;
+
+	/* panel wait times */
+	u8 idle_frames:4;
+	u8 wait_lines:3;
+	u8 rsvd2:1;
+
+	/* TP1 wakeup time */
+	u16 wakeup_tp1;
+
+	/* TP2 wakeup time */
+	u16 wakeup_tp2;
+} __attribute__((packed));
+
 /* LFP pointer table contains entries to the struct below */
 struct bdb_lvds_lfp_data_ptr {
 	u16 fp_timing_offset; /* offsets are from start of bdb */
-- 
1.7.11.7