[Intel-gfx] [RFC 02/14] drm/i915: Add support for TEAR ON Sequence

[Gaurav K Singh]

For command mode panel, panel's fb enabling and tearing configuration
is done as part of TEAR ON sequence. This patch parses and executes
TEAR ON sequence for MIPI command mode.

Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu at intel.com>
---
 drivers/gpu/drm/i915/intel_bios.h          |    4 ++++
 drivers/gpu/drm/i915/intel_dsi_panel_vbt.c |   11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index af0b476..be4eaab 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -934,6 +934,10 @@ enum mipi_seq {
 	MIPI_SEQ_DISPLAY_ON,
 	MIPI_SEQ_DISPLAY_OFF,
 	MIPI_SEQ_DEASSERT_RESET,
+	MIPI_SEQ_BACKLIGHT_ON,
+	MIPI_SEQ_BACKLIGHT_OFF,
+	MIPI_SEQ_TEAR_ON,
+	MIPI_SEQ_TEAR_OFF,
 	MIPI_SEQ_MAX
 };
 
diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index d2cd8d5..9deaec3 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -251,7 +251,11 @@ static const char * const seq_name[] = {
 	"MIPI_SEQ_INIT_OTP",
 	"MIPI_SEQ_DISPLAY_ON",
 	"MIPI_SEQ_DISPLAY_OFF",
-	"MIPI_SEQ_DEASSERT_RESET"
+	"MIPI_SEQ_DEASSERT_RESET",
+	"MIPI_SEQ_BACKLIGHT_ON",
+	"MIPI_SEQ_BACKLIGHT_OFF",
+	"MIPI_SEQ_TEAR_ON",
+	"MIPI_SEQ_TEAR_OFF"
 };
 
 static void generic_exec_sequence(struct intel_dsi *intel_dsi, const u8 *data)
@@ -306,6 +310,11 @@ static int vbt_panel_prepare(struct drm_panel *panel)
 	sequence = dev_priv->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
 	generic_exec_sequence(intel_dsi, sequence);
 
+	if (intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE) {
+		sequence = dev_priv->vbt.dsi.sequence[MIPI_SEQ_TEAR_ON];
+		generic_exec_sequence(intel_dsi, sequence);
+	}
+
 	return 0;
 }
 
-- 
1.7.9.5