[PATCH 10/23] drm/i915/dp: Allow big joiner modes in intel_dp_mode_valid()
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Wed Sep 18 14:11:03 UTC 2019
Small changes to intel_dp_mode_valid(), allow listing modes that
can only be supported in the bigjoiner configuration, which is
not supported yet.
Also unexport a few functions only used internally in intel_dp.c
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 98 +++++++++++++++++++------
1 file changed, 75 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index fe3283633e1c..f28e4f962622 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -247,7 +247,7 @@ intel_dp_max_data_rate(int max_link_clock, int max_lanes)
}
static int
-intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp)
+intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp, bool allow_bigjoiner)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &intel_dig_port->base;
@@ -257,6 +257,9 @@ intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp)
int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
+ if (allow_bigjoiner && INTEL_GEN(dev_priv) >= 11)
+ max_dotclk *= 2;
+
if (type != DP_DS_PORT_TYPE_VGA)
return max_dotclk;
@@ -505,8 +508,10 @@ u32 intel_dp_fec_to_mode_clock(u32 fec_clock)
1000000U);
}
-static u16 intel_dp_dsc_get_output_bpp(u32 link_clock, u32 lane_count,
- u32 mode_clock, u32 mode_hdisplay)
+static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *dev_priv,
+ u32 link_clock, u32 lane_count,
+ u32 mode_clock, u32 mode_hdisplay,
+ bool bigjoiner)
{
u32 bits_per_pixel, max_bpp_small_joiner_ram;
int i;
@@ -523,6 +528,10 @@ static u16 intel_dp_dsc_get_output_bpp(u32 link_clock, u32 lane_count,
/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
max_bpp_small_joiner_ram = DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER / mode_hdisplay;
+
+ if (bigjoiner)
+ max_bpp_small_joiner_ram *= 2;
+
DRM_DEBUG_KMS("Max small joiner bpp: %u\n", max_bpp_small_joiner_ram);
/*
@@ -531,6 +540,15 @@ static u16 intel_dp_dsc_get_output_bpp(u32 link_clock, u32 lane_count,
*/
bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
+ if (bigjoiner) {
+ u32 max_bpp_bigjoiner =
+ dev_priv->max_cdclk_freq * 48 /
+ intel_dp_mode_to_fec_clock(mode_clock);
+
+ DRM_DEBUG_KMS("Max big joiner bpp: %u\n", max_bpp_bigjoiner);
+ bits_per_pixel = min(bits_per_pixel, max_bpp_bigjoiner);
+ }
+
/* Error out if the max bpp is less than smallest allowed valid bpp */
if (bits_per_pixel < valid_dsc_bpp[0]) {
DRM_DEBUG_KMS("Unsupported BPP %u, min %u\n",
@@ -553,7 +571,8 @@ static u16 intel_dp_dsc_get_output_bpp(u32 link_clock, u32 lane_count,
}
static u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
- int mode_clock, int mode_hdisplay)
+ int mode_clock, int mode_hdisplay,
+ bool bigjoiner)
{
u8 min_slice_count, i;
int max_slice_width;
@@ -578,12 +597,20 @@ static u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
/* Find the closest match to the valid slice count values */
for (i = 0; i < ARRAY_SIZE(valid_dsc_slicecount); i++) {
- if (valid_dsc_slicecount[i] >
- drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
- false))
+ u8 test_slice_count = bigjoiner ?
+ 2 * valid_dsc_slicecount[i] :
+ valid_dsc_slicecount[i];
+
+ if (test_slice_count >
+ drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd, false))
break;
- if (min_slice_count <= valid_dsc_slicecount[i])
- return valid_dsc_slicecount[i];
+
+ /* big joiner needs small joiner to be enabled */
+ if (bigjoiner && test_slice_count < 4)
+ continue;
+
+ if (min_slice_count <= test_slice_count)
+ return test_slice_count;
}
DRM_DEBUG_KMS("Unsupported Slice Count %d\n", min_slice_count);
@@ -603,11 +630,15 @@ intel_dp_mode_valid(struct drm_connector *connector,
int max_dotclk;
u16 dsc_max_output_bpp = 0;
u8 dsc_slice_count = 0;
+ bool dsc = false, bigjoiner = false;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
return MODE_NO_DBLESCAN;
- max_dotclk = intel_dp_downstream_max_dotclock(intel_dp);
+ if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+ return MODE_H_ILLEGAL;
+
+ max_dotclk = intel_dp_downstream_max_dotclock(intel_dp, false);
if (intel_dp_is_edp(intel_dp) && fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
@@ -619,6 +650,18 @@ intel_dp_mode_valid(struct drm_connector *connector,
target_clock = fixed_mode->clock;
}
+ if (mode->clock < 10000)
+ return MODE_CLOCK_LOW;
+
+ if (target_clock > max_dotclk) {
+ max_dotclk = intel_dp_downstream_max_dotclock(intel_dp, true);
+
+ if (target_clock > max_dotclk)
+ return MODE_CLOCK_HIGH;
+
+ bigjoiner = true;
+ }
+
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);
@@ -639,26 +682,32 @@ intel_dp_mode_valid(struct drm_connector *connector,
true);
} else if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) {
dsc_max_output_bpp =
- intel_dp_dsc_get_output_bpp(max_link_clock,
+ intel_dp_dsc_get_output_bpp(dev_priv,
+ max_link_clock,
max_lanes,
target_clock,
- mode->hdisplay) >> 4;
+ mode->hdisplay,
+ bigjoiner) >> 4;
dsc_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
target_clock,
- mode->hdisplay);
+ mode->hdisplay,
+ bigjoiner);
}
+
+ dsc = dsc_max_output_bpp && dsc_slice_count;
}
- if ((mode_rate > max_rate && !(dsc_max_output_bpp && dsc_slice_count)) ||
- target_clock > max_dotclk)
+ /* big joiner configuration needs DSC */
+ if (bigjoiner && !dsc) {
+ DRM_DEBUG_KMS("Link clock needs bigjoiner, but DSC or FEC not available\n");
return MODE_CLOCK_HIGH;
+ }
- if (mode->clock < 10000)
- return MODE_CLOCK_LOW;
-
- if (mode->flags & DRM_MODE_FLAG_DBLCLK)
- return MODE_H_ILLEGAL;
+ if (mode_rate > max_rate && !dsc) {
+ DRM_DEBUG_KMS("Cannot drive without DSC\n");
+ return MODE_CLOCK_HIGH;
+ }
return MODE_OK;
}
@@ -2068,14 +2117,17 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
u8 dsc_dp_slice_count;
dsc_max_output_bpp =
- intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
+ intel_dp_dsc_get_output_bpp(dev_priv,
+ pipe_config->port_clock,
pipe_config->lane_count,
adjusted_mode->crtc_clock,
- adjusted_mode->crtc_hdisplay);
+ adjusted_mode->crtc_hdisplay,
+ false);
dsc_dp_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
adjusted_mode->crtc_clock,
- adjusted_mode->crtc_hdisplay);
+ adjusted_mode->crtc_hdisplay,
+ false);
if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
return -EINVAL;
--
2.20.1
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