[PATCH v4 02/21] drm/i915/dsb: Provide intel_dsb_head() and intel_dsb_size()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

The upcoming flip queue implementation will need to know the
DSB buffer head and size. Expose those outside intel_dsb.c.

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 9 +++++++--
 drivers/gpu/drm/i915/display/intel_dsb.h | 2 ++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c 
b/drivers/gpu/drm/i915/display/intel_dsb.c
index abda04d969c7..8cbb5695c651 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -242,14 +242,19 @@ static bool is_dsb_busy(struct intel_display *display, 
enum pipe pipe,
        return intel_de_read_fw(display, DSB_CTRL(pipe, dsb_id)) & 
DSB_STATUS_BUSY;
 }
 
-static unsigned int intel_dsb_head(struct intel_dsb *dsb)
+unsigned int intel_dsb_size(struct intel_dsb *dsb)
+{
+       return dsb->free_pos * 4;
+}
+
+unsigned int intel_dsb_head(struct intel_dsb *dsb)
 {
        return intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf);
 }
 
 static unsigned int intel_dsb_tail(struct intel_dsb *dsb)
 {
-       return intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf) + dsb->free_pos * 4;
+       return intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf) + 
intel_dsb_size(dsb);
 }
 
 static void intel_dsb_ins_align(struct intel_dsb *dsb)
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h 
b/drivers/gpu/drm/i915/display/intel_dsb.h
index 6900acd603b8..ab6489749866 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb.h
@@ -26,6 +26,8 @@ enum intel_dsb_id {
        I915_MAX_DSBS,
 };
 
+unsigned int intel_dsb_size(struct intel_dsb *dsb);
+unsigned int intel_dsb_head(struct intel_dsb *dsb);
 struct intel_dsb *intel_dsb_prepare(struct intel_atomic_state *state,
                                    struct intel_crtc *crtc,
                                    enum intel_dsb_id dsb_id,
-- 
2.49.0