On Tue, Aug 28, 2018 at 03:47:21PM -0700, Manasi Navare wrote:
> On Tue, Aug 28, 2018 at 03:18:56PM -0700, Srivatsa, Anusha wrote:
> >
> >
> > >-----Original Message-----
> > >From: Navare, Manasi D
> > >Sent: Tuesday, July 31, 2018 2:07 PM
> > >To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > >Cc: Singh, Gaurav K <gaurav.k.singh@xxxxxxxxx>; Jani Nikula
> > ><jani.nikula@xxxxxxxxxxxxxxx>; Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>;
> > >Srivatsa, Anusha <anusha.srivatsa@xxxxxxxxx>; Navare, Manasi D
> > ><manasi.d.navare@xxxxxxxxx>
> > >Subject: [PATCH v2 15/23] drm/i915/dsc: Define & Compute VESA DSC params
> > >
> > >From: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> > >
> > >This patches does the following:
> > >
> > >1. This patch defines all the DSC parameters as per the VESA DSC specification.
> > >These are stored in the encoder and used to compute the PPS parameters to be
> > >sent to the Sink.
> > >2. Compute all the DSC parameters which are derived from DSC state of
> > >intel_crtc_state.
> > >3. Compute all parameters that are VESA DSC specific
> > >
> > >This computation happens in the atomic check phase during
> > >compute_config() to validate if display stream compression can be enabled for
> > >the requested mode.
> > >
> > >v5 (From Manasi):
> > >* Add logic to limit the max line buf depth for DSC 1.1 to 13 as per DSC 1.1 spec
> > >* Fix dim checkpatch warnings/checks
> > >
> > >v4 (From Gaurav):
> > >* Rebase on latest drm tip
> > >* rename variable name(Manasi)
> > >* Populate linebuf_depth variable(Manasi)
> > >
> > >v3 (From Gaurav):
> > >* Rebase my previous patches on top of Manasi's latest patch series
> > >* Using >>n rather than /2^n (Manasi)
> > >* Change the commit message to explain what the patch is doing(Gaurav)
> > >
> > >Fixed review comments from Ville:
> > >* Don't use macro TWOS_COMPLEMENT
> > >* Mention in comment about the source of RC params
> > >* Return directly from case statements
> > >* Using single asssignment for assigning rc_range_params
> > >* Using <<n rather than *2^n and removing the comments about the fixed point
> > >numbers
> > >
> > >v2 (From Manasi):
> > >* Update logic for minor version to consider the dpcd value and what supported
> > >by the HW platform
> > >* Use DRM DSC config struct instead of intel_dp struct
> > >* Move the DSC constants to DRM DSC header file
> > >* Use u16, u8 where bigger data types not needed
> > >* * Compute the DSC parameters as part of DSC compute config since the
> > >computation can fail (Manasi)
> > >
> > >Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> > >Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> > >Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> > >Cc: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> > >Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> > >Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > >---
> > > drivers/gpu/drm/i915/Makefile | 3 +-
> > > drivers/gpu/drm/i915/intel_dp.c | 7 +
> > > drivers/gpu/drm/i915/intel_drv.h | 4 +
> > > drivers/gpu/drm/i915/intel_vdsc.c | 455
> > >++++++++++++++++++++++++++++++++++++++
> > > include/drm/drm_dp_helper.h | 3 +
> > > include/drm/drm_dsc.h | 2 +-
> > > 6 files changed, 472 insertions(+), 2 deletions(-) create mode 100644
> > >drivers/gpu/drm/i915/intel_vdsc.c
> > >
> > >diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> > >index 5794f10..deaf2d4 100644
> > >--- a/drivers/gpu/drm/i915/Makefile
> > >+++ b/drivers/gpu/drm/i915/Makefile
> > >@@ -153,7 +153,8 @@ i915-y += dvo_ch7017.o \
> > > intel_sdvo.o \
> > > intel_tv.o \
> > > vlv_dsi.o \
> > >- vlv_dsi_pll.o
> > >+ vlv_dsi_pll.o \
> > >+ intel_vdsc.o
> > >
> > > # Post-mortem debug and GPU hang state capture
> > > i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o diff --git
> > >a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index
> > >7132f52..dc0a3c2 100644
> > >--- a/drivers/gpu/drm/i915/intel_dp.c
> > >+++ b/drivers/gpu/drm/i915/intel_dp.c
> > >@@ -2042,6 +2042,13 @@ static bool intel_dp_dsc_compute_config(struct
> > >intel_dp *intel_dp,
> > > return false;
> > > }
> > > }
> > >+ if (intel_dp_compute_dsc_params(intel_dp, pipe_config) < 0) {
> > >+ DRM_ERROR("Cannot compute valid DSC parameters for Input
> > >Bpp = %d"
> > >+ "Compressed BPP = %d\n",
> > >+ pipe_config->pipe_bpp,
> > >+ pipe_config->dsc_params.compressed_bpp);
> > >+ return false;
> > >+ }
> > > pipe_config->dsc_params.compression_enable = true;
> > > DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> > > "Compressed Bpp = %d Slice Count = %d\n", diff --git
> > >a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > >index b7c2652..33cc777 100644
> > >--- a/drivers/gpu/drm/i915/intel_drv.h
> > >+++ b/drivers/gpu/drm/i915/intel_drv.h
> > >@@ -1749,6 +1749,10 @@ uint16_t intel_dp_dsc_get_output_bpp(int link_clock,
> > >uint8_t lane_count, uint8_t intel_dp_dsc_get_slice_count(struct intel_dp
> > >*intel_dp, int mode_clock,
> > > int mode_hdisplay);
> > >
> > >+/* intel_vdsc.c */
> > >+int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
> > >+ struct intel_crtc_state *pipe_config);
> > >+
> > > static inline unsigned int intel_dp_unused_lane_mask(int lane_count) {
> > > return ~((1 << lane_count) - 1) & 0xf; diff --git
> > >a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> > >new file mode 100644
> > >index 0000000..ecd270c
> > >--- /dev/null
> > >+++ b/drivers/gpu/drm/i915/intel_vdsc.c
> > >@@ -0,0 +1,455 @@
> > >+/*
> > >+ * Copyright © 2018 Intel Corporation
> > >+ *
> > >+ * Permission is hereby granted, free of charge, to any person
> > >+obtaining a
> > >+ * copy of this software and associated documentation files (the
> > >+"Software"),
> > >+ * to deal in the Software without restriction, including without
> > >+limitation
> > >+ * the rights to use, copy, modify, merge, publish, distribute,
> > >+sublicense,
> > >+ * and/or sell copies of the Software, and to permit persons to whom
> > >+the
> > >+ * Software is furnished to do so, subject to the following conditions:
> > >+ *
> > >+ * The above copyright notice and this permission notice (including the
> > >+next
> > >+ * paragraph) shall be included in all copies or substantial portions
> > >+of the
> > >+ * Software.
> > >+ *
> > >+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > >+EXPRESS OR
> > >+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> > >+MERCHANTABILITY,
> > >+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> > >EVENT
> > >+SHALL
> > >+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> > >DAMAGES OR
> > >+OTHER
> > >+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> > >+ARISING
> > >+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > >OTHER
> > >+ * DEALINGS IN THE SOFTWARE.
> > >+ *
> > >+ * Author: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> > >+ * Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > >+ */
> > >+
> > >+#include <drm/drmP.h>
> > >+#include <drm/i915_drm.h>
> > >+#include "i915_drv.h"
> > >+#include "intel_drv.h"
> > >+
> > >+enum ROW_INDEX_BPP {
> > >+ ROW_INDEX_6BPP = 0,
> > >+ ROW_INDEX_8BPP,
> > >+ ROW_INDEX_10BPP,
> > >+ ROW_INDEX_12BPP,
> > >+ ROW_INDEX_15BPP,
> > >+ MAX_ROW_INDEX
> > >+};
> > >+
> > >+enum COLUMN_INDEX_BPC {
> > >+ COLUMN_INDEX_8BPC = 0,
> > >+ COLUMN_INDEX_10BPC,
> > >+ COLUMN_INDEX_12BPC,
> > >+ COLUMN_INDEX_14BPC,
> > >+ COLUMN_INDEX_16BPC,
> > >+ MAX_COLUMN_INDEX
> > >+};
> > >+
> > >+#define DSC_SUPPORTED_VERSION_MIN 1
> > >+
> > >+/* From DSC_v1.11 spec, rc_parameter_Set syntax element typically
> > >+constant */ static u16 rc_buf_thresh[] = {
> > >+ 896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
> > >+ 7744, 7872, 8000, 8064
> > >+};
> > >+
> > >+struct rc_parameters {
> > >+ u16 initial_xmit_delay;
> > >+ u8 first_line_bpg_offset;
> > >+ u16 initial_offset;
> > >+ u8 flatness_min_qp;
> > >+ u8 flatness_max_qp;
> > >+ u8 rc_quant_incr_limit0;
> > >+ u8 rc_quant_incr_limit1;
> > >+ struct dsc_rc_range_parameters
> > >rc_range_params[DSC_NUM_BUF_RANGES];
> > >+};
> > >+
> > >+/*
> > >+ * Selected Rate Control Related Parameter Recommended Values
> > >+ * from DSC_v1.11 spec & C Model release: DSC_model_20161212 */ static
> > >+struct rc_parameters rc_params[][MAX_COLUMN_INDEX] = { {
> > >+ /* 6BPP/8BPC */
> > >+ { 768, 15, 6144, 3, 13, 11, 11, {
> > >+ { 0, 4, 0 }, { 1, 6, -2 }, { 3, 8, -2 }, { 4, 8, -4 },
> > >+ { 5, 9, -6 }, { 5, 9, -6 }, { 6, 9, -6 }, { 6, 10, -8 },
> > >+ { 7, 11, -8 }, { 8, 12, -10 }, { 9, 12, -10 }, { 10, 12, -12 },
> > >+ { 10, 12, -12 }, { 11, 12, -12 }, { 13, 14, -12 }
> > >+ }
> > >+ },
> > >+ /* 6BPP/10BPC */
> > >+ { 768, 15, 6144, 7, 17, 15, 15, {
> > >+ { 0, 8, 0 }, { 3, 10, -2 }, { 7, 12, -2 }, { 8, 12, -4 },
> > >+ { 9, 13, -6 }, { 9, 13, -6 }, { 10, 13, -6 }, { 10, 14, -8 },
> > >+ { 11, 15, -8 }, { 12, 16, -10 }, { 13, 16, -10 },
> > >+ { 14, 16, -12 }, { 14, 16, -12 }, { 15, 16, -12 },
> > >+ { 17, 18, -12 }
> > >+ }
> > >+ },
> > >+ /* 6BPP/12BPC */
> > >+ { 768, 15, 6144, 11, 21, 19, 19, {
> > >+ { 0, 12, 0 }, { 5, 14, -2 }, { 11, 16, -2 }, { 12, 16, -4 },
> > >+ { 13, 17, -6 }, { 13, 17, -6 }, { 14, 17, -6 }, { 14, 18, -8 },
> > >+ { 15, 19, -8 }, { 16, 20, -10 }, { 17, 20, -10 },
> > >+ { 18, 20, -12 }, { 18, 20, -12 }, { 19, 20, -12 },
> > >+ { 21, 22, -12 }
> > >+ }
> > >+ },
> > >+ /* 6BPP/14BPC */
> > >+ { 768, 15, 6144, 15, 25, 23, 27, {
> > >+ { 0, 16, 0 }, { 7, 18, -2 }, { 15, 20, -2 }, { 16, 20, -4 },
> > >+ { 17, 21, -6 }, { 17, 21, -6 }, { 18, 21, -6 }, { 18, 22, -8 },
> > >+ { 19, 23, -8 }, { 20, 24, -10 }, { 21, 24, -10 },
> > >+ { 22, 24, -12 }, { 22, 24, -12 }, { 23, 24, -12 },
> > >+ { 25, 26, -12 }
> > >+ }
> > >+ },
> > >+ /* 6BPP/16BPC */
> > >+ { 768, 15, 6144, 19, 29, 27, 27, {
> > >+ { 0, 20, 0 }, { 9, 22, -2 }, { 19, 24, -2 }, { 20, 24, -4 },
> > >+ { 21, 25, -6 }, { 21, 25, -6 }, { 22, 25, -6 }, { 22, 26, -8 },
> > >+ { 23, 27, -8 }, { 24, 28, -10 }, { 25, 28, -10 },
> > >+ { 26, 28, -12 }, { 26, 28, -12 }, { 27, 28, -12 },
> > >+ { 29, 30, -12 }
> > >+ }
> > >+ },
> > >+},
> > >+{
> > >+ /* 8BPP/8BPC */
> > >+ { 512, 12, 6144, 3, 12, 11, 11, {
> > >+ { 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
> > >+ { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> > >+ { 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
> > >+ { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> > >+ }
> > >+ },
> > >+ /* 8BPP/10BPC */
> > >+ { 512, 12, 6144, 7, 16, 15, 15, {
> > >+ { 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
> > >+ { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> > >+ { 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> > >+ { 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> > >+ }
> > >+ },
> > >+ /* 8BPP/12BPC */
> > >+ { 512, 12, 6144, 11, 20, 19, 19, {
> > >+ { 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
> > >+ { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> > >+ { 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> > >+ { 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> > >+ { 21, 23, -12 }
> > >+ }
> > >+ },
> > >+ /* 8BPP/14BPC */
> > >+ { 512, 12, 6144, 15, 24, 23, 23, {
> > >+ { 0, 12, 0 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
> > >+ { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
> > >+ { 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
> > >+ { 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
> > >+ { 24, 25, -12 }
> > >+ }
> > >+ },
> > >+ /* 8BPP/16BPC */
> > >+ { 512, 12, 6144, 19, 28, 27, 27, {
> > >+ { 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
> > >+ { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
> > >+ { 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
> > >+ { 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
> > >+ { 28, 29, -12 }
> > >+ }
> > >+ },
> > >+},
> > >+{
> > >+ /* 10BPP/8BPC */
> > >+ { 410, 15, 5632, 3, 12, 11, 11, {
> > >+ { 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
> > >+ { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> > >+ { 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
> > >+ { 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
> > >+ }
> > >+ },
> > >+ /* 10BPP/10BPC */
> > >+ { 410, 15, 5632, 7, 16, 15, 15, {
> > >+ { 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
> > >+ { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> > >+ { 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
> > >+ { 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
> > >+ }
> > >+ },
> > >+ /* 10BPP/12BPC */
> > >+ { 410, 15, 5632, 11, 20, 19, 19, {
> > >+ { 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
> > >+ { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> > >+ { 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
> > >+ { 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
> > >+ { 19, 20, -12 }
> > >+ }
> > >+ },
> > >+ /* 10BPP/14BPC */
> > >+ { 410, 15, 5632, 15, 24, 23, 23, {
> > >+ { 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
> > >+ { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
> > >+ { 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
> > >+ { 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
> > >+ { 23, 24, -12 }
> > >+ }
> > >+ },
> > >+ /* 10BPP/16BPC */
> > >+ { 410, 15, 5632, 19, 28, 27, 27, {
> > >+ { 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
> > >+ { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
> > >+ { 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
> > >+ { 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
> > >+ { 27, 28, -12 }
> > >+ }
> > >+ },
> > >+},
> > >+{
> > >+ /* 12BPP/8BPC */
> > >+ { 341, 15, 2048, 3, 12, 11, 11, {
> > >+ { 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
> > >+ { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> > >+ { 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
> > >+ { 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> > >+ }
> > >+ },
> > >+ /* 12BPP/10BPC */
> > >+ { 341, 15, 2048, 7, 16, 15, 15, {
> > >+ { 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
> > >+ { 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> > >+ { 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> > >+ { 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> > >+ }
> > >+ },
> > >+ /* 12BPP/12BPC */
> > >+ { 341, 15, 2048, 11, 20, 19, 19, {
> > >+ { 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
> > >+ { 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> > >+ { 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> > >+ { 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> > >+ { 21, 23, -12 }
> > >+ }
> > >+ },
> > >+ /* 12BPP/14BPC */
> > >+ { 341, 15, 2048, 15, 24, 23, 23, {
> > >+ { 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
> > >+ { 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
> > >+ { 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
> > >+ { 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
> > >+ { 22, 23, -12 }
> > >+ }
> > >+ },
> > >+ /* 12BPP/16BPC */
> > >+ { 341, 15, 2048, 19, 28, 27, 27, {
> > >+ { 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
> > >+ { 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
> > >+ { 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
> > >+ { 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
> > >+ { 26, 27, -12 }
> > >+ }
> > >+ },
> > >+},
> > >+{
> > >+ /* 15BPP/8BPC */
> > >+ { 273, 15, 2048, 3, 12, 11, 11, {
> > >+ { 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
> > >+ { 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
> > >+ { 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
> > >+ { 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
> > >+ }
> > >+ },
> > >+ /* 15BPP/10BPC */
> > >+ { 273, 15, 2048, 7, 16, 15, 15, {
> > >+ { 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
> > >+ { 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
> > >+ { 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
> > >+ { 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
> > >+ }
> > >+ },
> > >+ /* 15BPP/12BPC */
> > >+ { 273, 15, 2048, 11, 20, 19, 19, {
> > >+ { 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
> > >+ { 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
> > >+ { 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
> > >+ { 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
> > >+ { 16, 17, -12 }
> > >+ }
> > >+ },
> > >+ /* 15BPP/14BPC */
> > >+ { 273, 15, 2048, 15, 24, 23, 23, {
> > >+ { 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
> > >+ { 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
> > >+ { 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
> > >+ { 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
> > >+ { 20, 21, -12 }
> > >+ }
> > >+ },
> > >+ /* 15BPP/16BPC */
> > >+ { 273, 15, 2048, 19, 28, 27, 27, {
> > >+ { 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
> > >+ { 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
> > >+ { 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
> > >+ { 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
> > >+ { 24, 25, -12 }
> > >+ }
> > >+ }
> > >+}
> > >+};
> > >+
> > >+static int get_row_index_for_rc_params(u16 compressed_bpp) {
> > >+ switch (compressed_bpp) {
> > >+ case 6:
> > >+ return ROW_INDEX_6BPP;
> > >+ case 8:
> > >+ return ROW_INDEX_8BPP;
> > >+ case 10:
> > >+ return ROW_INDEX_10BPP;
> > >+ case 12:
> > >+ return ROW_INDEX_12BPP;
> > >+ case 15:
> > >+ return ROW_INDEX_15BPP;
> > >+ default:
> > >+ return -EINVAL;
> > >+ }
> > >+}
> > >+
> > >+static int get_column_index_for_rc_params(u8 bits_per_component) {
> > >+ switch (bits_per_component) {
> > >+ case 8:
> > >+ return COLUMN_INDEX_8BPC;
> > >+ case 10:
> > >+ return COLUMN_INDEX_10BPC;
> > >+ case 12:
> > >+ return COLUMN_INDEX_12BPC;
> > >+ case 14:
> > >+ return COLUMN_INDEX_14BPC;
> > >+ case 16:
> > >+ return COLUMN_INDEX_16BPC;
> > >+ default:
> > >+ return -EINVAL;
> > >+ }
> > >+}
> > >+
> > >+int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
> > >+ struct intel_crtc_state *pipe_config) {
> > >+ struct drm_dsc_config *vdsc_cfg = &pipe_config->dp_dsc_cfg;
> > >+ u16 compressed_bpp = pipe_config->dsc_params.compressed_bpp;
> > >+ u8 i = 0;
> > >+ u8 row_index = 0;
> > >+ u8 column_index = 0;
> > >+ u8 line_buf_depth = 0;
> > >+
> > >+ vdsc_cfg->pic_width = pipe_config->base.adjusted_mode.crtc_hdisplay;
> > >+ vdsc_cfg->pic_height = pipe_config->base.adjusted_mode.crtc_vdisplay;
> > >+ vdsc_cfg->slice_width = DIV_ROUND_UP(vdsc_cfg->pic_width,
> > >+ pipe_config-
> > >>dsc_params.slice_count);
> > >+ /*
> > >+ * Slice Height of 8 works for all currently available panels. So start
> > >+ * with that if pic_height is an integral multiple of 8.
> > >+ * Eventually add logic to try multiple slice heights.
> > >+ */
> > >+ if (vdsc_cfg->pic_height % 8 == 0)
> > >+ vdsc_cfg->slice_height = 8;
> > >+ else if (vdsc_cfg->pic_height % 4 == 0)
> > >+ vdsc_cfg->slice_height = 4;
> > >+ else
> > >+ vdsc_cfg->slice_height = 2;
> > >+
> > >+ /* Values filled from DSC Sink DPCD */
> > >+ vdsc_cfg->dsc_version_major = (intel_dp->dsc_dpcd[DP_DSC_REV -
> > >DP_DSC_SUPPORT] &
> > >+ DP_DSC_MAJOR_MASK) >>
> > >DP_DSC_MAJOR_SHIFT;
> > >+ vdsc_cfg->dsc_version_minor = min(DSC_SUPPORTED_VERSION_MIN,
> > >+ (intel_dp->dsc_dpcd[DP_DSC_REV -
> > >DP_DSC_SUPPORT] &
> > >+ DP_DSC_MINOR_MASK) >>
> > >DP_DSC_MINOR_SHIFT);
> > >+
> > >+ vdsc_cfg->convert_rgb = intel_dp-
> > >>dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] &
> > >+ DP_DSC_RGB;
> > >+
> > >+ line_buf_depth = drm_dp_dsc_sink_line_buf_depth(intel_dp->dsc_dpcd);
> > >+ if (vdsc_cfg->dsc_version_minor == 2)
> > >+ vdsc_cfg->line_buf_depth = (line_buf_depth ==
> > >DSC_1_2_MAX_LINEBUF_DEPTH_BITS) ?
> > >+ DSC_1_2_MAX_LINEBUF_DEPTH_VAL : line_buf_depth;
> > Shouldn't this be line_buf_depth >= DSC_1_2_MAX_LINEBUF_DEPTH_BITS?
>
> If you look at drm_dp_dsc_sink_line_buf_depth() function, it will only return maximum of 16.
> Greater than DSC_1_2_MAX_LINEBUF_DEPTH_BITS is not a valid value and the function will return 0 for that.
>
But if at all its an invalid value greater than 16, then the function returns 0, so I will need to
add a check for it to be greater than 0.
Thanks for catching this!
Manasi
> >
> > >+ else
> > >+ vdsc_cfg->line_buf_depth = (line_buf_depth >
> > Line_buf_depth >= DSC_1_1_MAX_LINEBUF_DEPTH_BITS??
>
> This should be only greater than since if its equal to the max then it can just use the maximum value.
>
> Manasi
>
> >
> > Anusha
> > >DSC_1_1_MAX_LINEBUF_DEPTH_BITS) ?
> > >+ DSC_1_1_MAX_LINEBUF_DEPTH_BITS : line_buf_depth;
> > >+
> > >+ /* Gen 11 does not support YCbCr */
> > >+ vdsc_cfg->enable422 = false;
> > >+ /* Gen 11 does not support VBR */
> > >+ vdsc_cfg->vbr_enable = false;
> > >+ vdsc_cfg->block_pred_enable =
> > >+ intel_dp-
> > >>dsc_dpcd[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] &
> > >+ DP_DSC_BLK_PREDICTION_IS_SUPPORTED;
> > >+
> > >+ /* Gen 11 only supports integral values of bpp */
> > >+ vdsc_cfg->bits_per_pixel = compressed_bpp << 4;
> > >+ vdsc_cfg->bits_per_component = pipe_config->pipe_bpp / 3;
> > >+
> > >+ for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++) {
> > >+ /*
> > >+ * six 0s are appended to the lsb of each threshold value
> > >+ * internally in h/w.
> > >+ * Only 8 bits are allowed for programming RcBufThreshold
> > >+ */
> > >+ vdsc_cfg->rc_buf_thresh[i] = rc_buf_thresh[i] >> 6;
> > >+ }
> > >+
> > >+ /*
> > >+ * For 6bpp, RC Buffer threshold 12 and 13 need a different value
> > >+ * as per C Model
> > >+ */
> > >+ if (compressed_bpp == 6) {
> > >+ vdsc_cfg->rc_buf_thresh[12] = 0x7C;
> > >+ vdsc_cfg->rc_buf_thresh[13] = 0x7D;
> > >+ }
> > >+
> > >+ row_index = get_row_index_for_rc_params(compressed_bpp);
> > >+ column_index =
> > >+ get_column_index_for_rc_params(vdsc_cfg-
> > >>bits_per_component);
> > >+
> > >+ if (row_index < 0 || column_index < 0)
> > >+ return -EINVAL;
> > >+
> > >+ vdsc_cfg->first_line_bpg_offset =
> > >+ rc_params[row_index][column_index].first_line_bpg_offset;
> > >+ vdsc_cfg->initial_xmit_delay =
> > >+ rc_params[row_index][column_index].initial_xmit_delay;
> > >+ vdsc_cfg->initial_offset =
> > >+ rc_params[row_index][column_index].initial_offset;
> > >+ vdsc_cfg->flatness_min_qp =
> > >+ rc_params[row_index][column_index].flatness_min_qp;
> > >+ vdsc_cfg->flatness_max_qp =
> > >+ rc_params[row_index][column_index].flatness_max_qp;
> > >+ vdsc_cfg->rc_quant_incr_limit0 =
> > >+ rc_params[row_index][column_index].rc_quant_incr_limit0;
> > >+ vdsc_cfg->rc_quant_incr_limit1 =
> > >+ rc_params[row_index][column_index].rc_quant_incr_limit1;
> > >+
> > >+ for (i = 0; i < DSC_NUM_BUF_RANGES; i++)
> > >+ vdsc_cfg->rc_range_params[i] =
> > >+
> > > rc_params[row_index][column_index].rc_range_params[i];
> > >+
> > >+ /*
> > >+ * BitsPerComponent value determines mux_word_size:
> > >+ * When BitsPerComponent is 12bpc, muxWordSize will be equal to 64
> > >bits
> > >+ * When BitsPerComponent is 8 or 10bpc, muxWordSize will be equal to
> > >+ * 48 bits
> > >+ */
> > >+ if (vdsc_cfg->bits_per_component == 8 ||
> > >+ vdsc_cfg->bits_per_component == 10)
> > >+ vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
> > >+ else if (vdsc_cfg->bits_per_component == 12)
> > >+ vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
> > >+
> > >+ /* InitialScaleValue is a 6 bit value with 3 fractional bits (U3.3) */
> > >+ vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
> > >+ (vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
> > >+
> > >+ return 0;
> > >+}
> > >diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index
> > >0cf2407..f178933 100644
> > >--- a/include/drm/drm_dp_helper.h
> > >+++ b/include/drm/drm_dp_helper.h
> > >@@ -186,6 +186,9 @@
> > >
> > > #define DP_GUID 0x030 /* 1.2 */
> > >
> > >+#define DP_DSC_RC_PIXELS_PER_GROUP 3
> > >+#define DP_DSC_SCALE_DECREMENT_INTERVAL_MAX 4095
> > >+
> > > #define DP_DSC_SUPPORT 0x060 /* DP 1.4 */
> > > # define DP_DSC_DECOMPRESSION_IS_SUPPORTED (1 << 0)
> > >
> > >diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h index
> > >4cfcd03..796c798 100644
> > >--- a/include/drm/drm_dsc.h
> > >+++ b/include/drm/drm_dsc.h
> > >@@ -67,7 +67,7 @@ struct dsc_rc_range_parameters {
> > > /* Max Quantization Parameters allowed for this range */
> > > u8 range_max_qp;
> > > /* Bits/group offset to apply to target for this group */
> > >- u8 range_bpg_offset;
> > >+ s8 range_bpg_offset;
> > > };
> > >
> > > struct drm_dsc_config {
> > >--
> > >2.7.4
> >
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