[Intel-gfx] [RFC CABC v3 PATCH 1/2] drm/i915: Parsing the PWM cntrl and CABC ON/OFF fileds in VBT

[Deepak M]

For dual link panel scenarios there are new fileds added in the
VBT which indicate on which port the PWM cntrl and CABC ON/OFF
commands needs to be sent.

v2: Rebase
v3: Rebase

Signed-off-by: Deepak M <m.deepak at intel.com>
---
 drivers/gpu/drm/i915/intel_bios.c |   13 +++++++++++++
 drivers/gpu/drm/i915/intel_bios.h |    5 ++++-
 drivers/gpu/drm/i915/intel_dsi.h  |    2 ++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index c8acc29..dacfadd 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -789,6 +789,19 @@ parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
 		return;
 	}
 
+	/*
+	 * These below bits will inform us on which port the panel blk_cntrl and
+	 * CABC ON/OFF commands needs to be sent in case of dual link panels
+	 *	u16 dl_cabc_port:2;
+	 *	u16 pwm_bkl_ctrl:2;
+	 * But these are introduced from the VBT version 197 onwards, so making
+	 * sure that these bits are zero in the pervious versions.
+	 */
+	if (dev_priv->vbt.dsi.config->dual_link && bdb->version < 197) {
+		dev_priv->vbt.dsi.config->dl_cabc_port = 0;
+		dev_priv->vbt.dsi.config->pwm_bkl_ctrl = 0;
+	}
+
 	/* We have mandatory mipi config blocks. Initialize as generic panel */
 	dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
 
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index 1b7417e..544b51d 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -834,7 +834,10 @@ struct mipi_config {
 	u16 dual_link:2;
 	u16 lane_cnt:2;
 	u16 pixel_overlap:3;
-	u16 rsvd3:9;
+	u16 rgb_flip:1;
+	u16 dl_cabc_port:2;
+	u16 pwm_bkl_ctrl:2;
+	u16 rsvd3:4;
 
 	u16 rsvd4;
 
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 42a6859..c727d7b 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -74,6 +74,8 @@ struct intel_dsi {
 
 	u8 escape_clk_div;
 	u8 dual_link;
+	u8 dl_cabc_port;
+	u8 pwm_blk_ctrl;
 	u8 pixel_overlap;
 	u32 port_bits;
 	u32 bw_timer;
-- 
1.7.9.5