[PATCH v2 5/8] drm/i915/hdmi: Expose DSC min/max bpp helpers

Expose intel_hdmi_dsc_get_min_max_bpp() to query the allowed compressed
bpp range.
This will be used in the subsequent change to compute the compressed bpp
range in mode_valid() for an HDMI with DSC connected to a DP DFP.

Signed-off-by: Ankit Nautiyal <[email protected]>
Reviewed-by: Suraj Kandpal <[email protected]>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c | 20 +++++++++++++++-----
 drivers/gpu/drm/i915/display/intel_hdmi.h |  2 ++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index df88d7c141f7..ee6a559762c5 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -3325,9 +3325,19 @@ intel_hdmi_dsc_get_num_slices(const struct drm_display_mode *mode,
 	return target_slices;
 }
 
-static void
-get_dsc_min_max_bpp(enum intel_output_format output_format, u8 bpc,
-		    bool hdmi_all_bpp, int *min_dsc_bpp, int *max_dsc_bpp)
+/*
+ * intel_hdmi_dsc_get_min_max_bpp - get the min and max compressed bpp range
+ * allowed for a given output format and bpc.
+ *
+ * @output_format: video output format
+ * @bpc: bits per color
+ * @hdmi_all_bpp: sink supports decoding of 1/16th bpp setting
+ * @min_dsc_bpp: returns the minimum allowed compressed bpp
+ * @max_dsc_bpp: returns the maximum allowed compressed bpp
+ */
+void
+intel_hdmi_dsc_get_min_max_bpp(enum intel_output_format output_format, u8 bpc,
+			       bool hdmi_all_bpp, int *min_dsc_bpp, int *max_dsc_bpp)
 {
 	/*
 	 * Get min bpp and max bpp that can be supported for a
@@ -3433,8 +3443,8 @@ intel_hdmi_dsc_get_bpp(int src_fractional_bpp, int slice_width, int num_slices,
 	int max_dsc_bpp, min_dsc_bpp;
 	int dsc_bpp_x16;
 
-	get_dsc_min_max_bpp(output_format, bpc, hdmi_all_bpp,
-			    &min_dsc_bpp, &max_dsc_bpp);
+	intel_hdmi_dsc_get_min_max_bpp(output_format, bpc, hdmi_all_bpp,
+				       &min_dsc_bpp, &max_dsc_bpp);
 
 	dsc_bpp_x16 = get_dsc_compressed_bpp(num_slices, slice_width,
 					     hdmi_max_chunk_bytes,
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.h b/drivers/gpu/drm/i915/display/intel_hdmi.h
index c95ed37bcc0c..3ab75ef4836e 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.h
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.h
@@ -57,6 +57,8 @@ int intel_hdmi_tmds_clock(int clock, int bpc, enum intel_output_format sink_form
 int intel_hdmi_dsc_get_bpp(int src_fractional_bpp, int slice_width,
 			   int num_slices, enum intel_output_format output_format,
 			   int bpc, bool hdmi_all_bpp, int hdmi_max_chunk_bytes);
+void intel_hdmi_dsc_get_min_max_bpp(enum intel_output_format output_format, u8 bpc,
+				    bool hdmi_all_bpp, int *min_dsc_bpp, int *max_dsc_bpp);
 int intel_hdmi_dsc_get_num_slices(const struct drm_display_mode *mode,
 				  enum intel_output_format output_format,
 				  int src_max_slices, int src_max_slice_width,
-- 
2.50.1