This patch adds support to iterate over compressed output bpp as per the
fractional step, supported by DP sink.
v2:
-Avoid ending up with compressed bpp, same as pipe bpp. (Stan)
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Reviewed-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 41 +++++++++++++++----------
1 file changed, 25 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 246f50d1f030..e53c87825194 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1737,15 +1737,15 @@ static bool intel_dp_dsc_supports_format(const struct intel_connector *connector
return drm_dp_dsc_sink_supports_format(connector->dp.dsc_dpcd, sink_dsc_format);
}
-static bool is_bw_sufficient_for_dsc_config(u16 compressed_bpp, u32 link_clock,
+static bool is_bw_sufficient_for_dsc_config(u16 compressed_bppx16, u32 link_clock,
u32 lane_count, u32 mode_clock,
enum intel_output_format output_format,
int timeslots)
{
u32 available_bw, required_bw;
- available_bw = (link_clock * lane_count * timeslots) / 8;
- required_bw = compressed_bpp * (intel_dp_mode_to_fec_clock(mode_clock));
+ available_bw = (link_clock * lane_count * timeslots * 16) / 8;
+ required_bw = compressed_bppx16 * (intel_dp_mode_to_fec_clock(mode_clock));
return available_bw > required_bw;
}
@@ -1753,7 +1753,7 @@ static bool is_bw_sufficient_for_dsc_config(u16 compressed_bpp, u32 link_clock,
static int dsc_compute_link_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct link_config_limits *limits,
- u16 compressed_bpp,
+ u16 compressed_bppx16,
int timeslots)
{
const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
@@ -1768,8 +1768,8 @@ static int dsc_compute_link_config(struct intel_dp *intel_dp,
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
lane_count <<= 1) {
- if (!is_bw_sufficient_for_dsc_config(compressed_bpp, link_rate, lane_count,
- adjusted_mode->clock,
+ if (!is_bw_sufficient_for_dsc_config(compressed_bppx16, link_rate,
+ lane_count, adjusted_mode->clock,
pipe_config->output_format,
timeslots))
continue;
@@ -1882,7 +1882,7 @@ icl_dsc_compute_link_config(struct intel_dp *intel_dp,
ret = dsc_compute_link_config(intel_dp,
pipe_config,
limits,
- valid_dsc_bpp[i],
+ valid_dsc_bpp[i] << 4,
timeslots);
if (ret == 0) {
pipe_config->dsc.compressed_bpp_x16 =
@@ -1902,6 +1902,7 @@ icl_dsc_compute_link_config(struct intel_dp *intel_dp,
*/
static int
xelpd_dsc_compute_link_config(struct intel_dp *intel_dp,
+ const struct intel_connector *connector,
struct intel_crtc_state *pipe_config,
struct link_config_limits *limits,
int dsc_max_bpp,
@@ -1909,23 +1910,31 @@ xelpd_dsc_compute_link_config(struct intel_dp *intel_dp,
int pipe_bpp,
int timeslots)
{
- u16 compressed_bpp;
+ u8 bppx16_incr = drm_dp_dsc_sink_bpp_incr(connector->dp.dsc_dpcd);
+ struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+ u16 compressed_bppx16;
+ u8 bppx16_step;
int ret;
+ if (DISPLAY_VER(i915) < 14 || bppx16_incr <= 1)
+ bppx16_step = 16;
+ else
+ bppx16_step = 16 / bppx16_incr;
+
/* Compressed BPP should be less than the Input DSC bpp */
- dsc_max_bpp = min(dsc_max_bpp, pipe_bpp - 1);
+ dsc_max_bpp = min(dsc_max_bpp << 4, (pipe_bpp << 4) - bppx16_step);
+ dsc_min_bpp = dsc_min_bpp << 4;
- for (compressed_bpp = dsc_max_bpp;
- compressed_bpp >= dsc_min_bpp;
- compressed_bpp--) {
+ for (compressed_bppx16 = dsc_max_bpp;
+ compressed_bppx16 >= dsc_min_bpp;
+ compressed_bppx16 -= bppx16_step) {
ret = dsc_compute_link_config(intel_dp,
pipe_config,
limits,
- compressed_bpp,
+ compressed_bppx16,
timeslots);
if (ret == 0) {
- pipe_config->dsc.compressed_bpp_x16 =
- to_bpp_x16(compressed_bpp);
+ pipe_config->dsc.compressed_bpp_x16 = compressed_bppx16;
return 0;
}
}
@@ -1963,7 +1972,7 @@ static int dsc_compute_compressed_bpp(struct intel_dp *intel_dp,
dsc_max_bpp = min(dsc_max_bpp, to_bpp_int(limits->link.max_bpp_x16));
if (DISPLAY_VER(i915) >= 13)
- return xelpd_dsc_compute_link_config(intel_dp, pipe_config, limits,
+ return xelpd_dsc_compute_link_config(intel_dp, connector, pipe_config, limits,
dsc_max_bpp, dsc_min_bpp, pipe_bpp, timeslots);
return icl_dsc_compute_link_config(intel_dp, pipe_config, limits,
dsc_max_bpp, dsc_min_bpp, pipe_bpp, timeslots);
--
2.40.1
