Define frl_dfm structure to hold frl characteristics
needed for frl capacity computation in order to
meet the data flow metering requirement.
Signed-off-by: Vandita Kulkarni <vandita.kulka...@intel.com>
---
include/drm/drm_frl_dfm_helper.h | 124 +++++++++++++++++++++++++++++++
1 file changed, 124 insertions(+)
create mode 100644 include/drm/drm_frl_dfm_helper.h
diff --git a/include/drm/drm_frl_dfm_helper.h b/include/drm/drm_frl_dfm_helper.h
new file mode 100644
index 000000000000..5cab102fe25f
--- /dev/null
+++ b/include/drm/drm_frl_dfm_helper.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright © 2022 Intel Corp
+ */
+
+#ifndef DRM_FRL_DFM_H_
+#define DRM_FRL_DFM_H_
+
+/* DFM constraints and tolerance values from HDMI2.1 spec */
+#define TB_BORROWED_MAX 400
+#define FRL_CHAR_PER_CHAR_BLK 510
+/* Tolerance pixel clock unit is in mHz */
+#define TOLERANCE_PIXEL_CLOCK 5
+#define TOLERANCE_FRL_BIT_RATE 300
+#define TOLERANCE_AUDIO_CLOCK 1000
+#define ACR_RATE_MAX 1500
+#define EFFICIENCY_MULTIPLIER 1000
+#define OVERHEAD_M (3 * EFFICIENCY_MULTIPLIER / 1000)
+#define BPP_MULTIPLIER 16
+#define FRL_TIMING_NS_MULTIPLIER 1000000000
+
+/* ALl the input config needed to compute DFM requirements */
+struct drm_frl_dfm_input_config {
+ /*
+ * Pixel clock rate kHz, when FVA is
+ * enabled this rate is the rate after adjustment
+ */
+ unsigned int pixel_clock_nominal_khz;
+
+ /* active pixels per line */
+ unsigned int hactive;
+
+ /* Blanking pixels per line */
+ unsigned int hblank;
+
+ /* Bits per component */
+ unsigned int bpc;
+
+ /* Pixel encoding */
+ unsigned int color_format;
+
+ /* FRL bit rate in kbps */
+ unsigned int bit_rate_kbps;
+
+ /* FRL lanes */
+ unsigned int lanes;
+
+ /* Number of audio channels */
+ unsigned int audio_channels;
+
+ /* Audio rate in Hz */
+ unsigned int audio_hz;
+
+ /* Selected bpp target value */
+ unsigned int target_bpp_16;
+
+ /*
+ * Number of horizontal pixels in a slice.
+ * Equivalent to PPS parameter slice_width
+ */
+ unsigned int slice_width;
+};
+
+/* Computed dfm parameters as per the HDMI2.1 spec */
+struct drm_frl_dfm_params {
+ /*
+ * Link overhead in percentage
+ * multiplied by 1000 (efficiency multiplier)
+ */
+ unsigned int overhead_max;
+
+ /* Maximum pixel rate in kHz */
+ unsigned int pixel_clock_max_khz;
+
+ /* Minimum video line period in nano sec */
+ unsigned int line_time_ns;
+
+ /* worst case slow frl character rate in kbps */
+ unsigned int char_rate_min_kbps;
+
+ /* minimum total frl charecters per line perios */
+ unsigned int cfrl_line;
+
+ /* Average tribyte rate in khz */
+ unsigned int ftb_avg_k;
+
+ /* Audio characteristics */
+
+ /* number of audio packets needed during hblank */
+ unsigned int num_audio_pkts_line;
+
+ /*
+ * Minimum required hblank assuming no control preiod
+ * RC compression
+ */
+ unsigned int hblank_audio_min;
+
+ /* Number of tribytes required to carry active video */
+ unsigned int tb_active;
+
+ /* Total available tribytes during the blanking period */
+ unsigned int tb_blank;
+
+ /*
+ * Number of tribytes required to be transmitted during
+ * the hblank period
+ */
+ unsigned int tb_borrowed;
+
+ /* DSC frl characteristics */
+
+ /* Tribytes required to carry the target bpp */
+ unsigned int hcactive_target;
+
+ /* tribytes available during blanking with target bpp */
+ unsigned int hcblank_target;
+};
+
+/* FRL DFM structure to hold involved in DFM computation */
+struct drm_hdmi_frl_dfm {
+ struct drm_frl_dfm_input_config config;
+ struct drm_frl_dfm_params params;
+};
+
+#endif
--
2.32.0
