diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/dispnv50/disp.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv50/disp.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index a0ac8c258d9f..7840b6428afb 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1592,6 +1592,148 @@ nv50_sor_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *st nv_encoder->crtc = NULL; } +// common/inc/displayport/displayport.h +#define DP_CONFIG_WATERMARK_ADJUST 2 +#define DP_CONFIG_WATERMARK_LIMIT 20 +#define DP_CONFIG_INCREASED_WATERMARK_ADJUST 8 +#define DP_CONFIG_INCREASED_WATERMARK_LIMIT 22 + +static bool +nv50_sor_dp_watermark_sst(struct nouveau_encoder *outp, + struct nv50_head *head, struct nv50_head_atom *asyh) +{ + bool enhancedFraming = outp->dp.dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP; + u64 minRate = outp->dp.link_bw * 1000; + unsigned tuSize = 64; + unsigned waterMark; + unsigned hBlankSym; + unsigned vBlankSym; + unsigned watermarkAdjust = DP_CONFIG_WATERMARK_ADJUST; + unsigned watermarkMinimum = DP_CONFIG_WATERMARK_LIMIT; + // depth is multiplied by 16 in case of DSC enable + s32 hblank_symbols; + // number of link clocks per line. + int vblank_symbols = 0; + bool bEnableDsc = false; + unsigned surfaceWidth = asyh->mode.h.blanks - asyh->mode.h.blanke; + unsigned rasterWidth = asyh->mode.h.active; + unsigned depth = asyh->or.bpc * 3; + unsigned DSC_FACTOR = bEnableDsc ? 16 : 1; + u64 pixelClockHz = asyh->mode.clock * 1000; + u64 PrecisionFactor = 100000, ratioF, watermarkF; + u32 numLanesPerLink = outp->dp.link_nr; + u32 numSymbolsPerLine; + u32 BlankingBits; + u32 surfaceWidthPerLink; + u32 PixelSteeringBits; + u64 NumBlankingLinkClocks; + u32 MinHBlank; + + if (outp->outp.info.dp.increased_wm) { + watermarkAdjust = DP_CONFIG_INCREASED_WATERMARK_ADJUST; + watermarkMinimum = DP_CONFIG_INCREASED_WATERMARK_LIMIT; + } + + if ((pixelClockHz * depth) >= (8 * minRate * outp->dp.link_nr * DSC_FACTOR)) + { + return false; + } + + // + // For DSC, if (pclk * bpp) < (1/64 * orclk * 8 * lanes) then some TU may end up with + // 0 active symbols. This may cause HW hang. Bug 200379426 + // + if ((bEnableDsc) && + ((pixelClockHz * depth) < div_u64(8 * minRate * outp->dp.link_nr * DSC_FACTOR, 64))) + { + return false; + } + + // + // Perform the SST calculation. + // For auto mode the watermark calculation does not need to track accumulated error the + // formulas for manual mode will not work. So below calculation was extracted from the DTB. + // + ratioF = div_u64((u64)pixelClockHz * depth * PrecisionFactor, DSC_FACTOR); + + ratioF = div_u64(ratioF, 8 * (u64) minRate * outp->dp.link_nr); + + if (PrecisionFactor < ratioF) // Assert if we will end up with a negative number in below + return false; + + watermarkF = div_u64(ratioF * tuSize * (PrecisionFactor - ratioF), PrecisionFactor); + waterMark = (unsigned)(watermarkAdjust + (div_u64(2 * div_u64(depth * PrecisionFactor, 8 * numLanesPerLink * DSC_FACTOR) + watermarkF, PrecisionFactor))); + + // + // Bounds check the watermark + // + numSymbolsPerLine = div_u64(surfaceWidth * depth, 8 * outp->dp.link_nr * DSC_FACTOR); + + if (WARN_ON(waterMark > 39 || waterMark > numSymbolsPerLine)) + return false; + + // + // Clamp the low side + // + if (waterMark < watermarkMinimum) + waterMark = watermarkMinimum; + + //Bits to send BS/BE/Extra symbols due to pixel padding + //Also accounts for enhanced framing. + BlankingBits = 3*8*numLanesPerLink + (enhancedFraming ? 3*8*numLanesPerLink : 0); + + //VBID/MVID/MAUD sent 4 times all the time + BlankingBits += 3*8*4; + + surfaceWidthPerLink = surfaceWidth; + + //Extra bits sent due to pixel steering + u32 remain; + div_u64_rem(surfaceWidthPerLink, numLanesPerLink, &remain); + PixelSteeringBits = remain ? div_u64((numLanesPerLink - remain) * depth, DSC_FACTOR) : 0; + + BlankingBits += PixelSteeringBits; + NumBlankingLinkClocks = div_u64((u64)BlankingBits * PrecisionFactor, (8 * numLanesPerLink)); + MinHBlank = (u32)(div_u64(div_u64(NumBlankingLinkClocks * pixelClockHz, minRate), PrecisionFactor)); + MinHBlank += 12; + + if (WARN_ON(MinHBlank > rasterWidth - surfaceWidth)) + return false; + + // Bug 702290 - Active Width should be greater than 60 + if (WARN_ON(surfaceWidth <= 60)) + return false; + + + hblank_symbols = (s32)(div_u64((u64)(rasterWidth - surfaceWidth - MinHBlank) * minRate, pixelClockHz)); + + //reduce HBlank Symbols to account for secondary data packet + hblank_symbols -= 1; //Stuffer latency to send BS + hblank_symbols -= 3; //SPKT latency to send data to stuffer + + hblank_symbols -= numLanesPerLink == 1 ? 9 : numLanesPerLink == 2 ? 6 : 3; + + hBlankSym = (hblank_symbols < 0) ? 0 : hblank_symbols; + + // Refer to dev_disp.ref for more information. + // # symbols/vblank = ((SetRasterBlankEnd.X + SetRasterSize.Width - SetRasterBlankStart.X - 40) * link_clk / pclk) - Y - 1; + // where Y = (# lanes == 4) 12 : (# lanes == 2) ? 21 : 39 + if (surfaceWidth < 40) + { + vblank_symbols = 0; + } + else + { + vblank_symbols = (s32)((div_u64((u64)(surfaceWidth - 40) * minRate, pixelClockHz))) - 1; + + vblank_symbols -= numLanesPerLink == 1 ? 39 : numLanesPerLink == 2 ? 21 : 12; + } + + vBlankSym = (vblank_symbols < 0) ? 0 : vblank_symbols; + + return nvif_outp_dp_sst(&outp->outp, head->base.index, waterMark, hBlankSym, vBlankSym); +} + static void nv50_sor_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state) { @@ -1679,6 +1821,7 @@ nv50_sor_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *sta break; case DCB_OUTPUT_DP: nouveau_dp_train(nv_encoder, false, mode->clock, asyh->or.bpc); + nv50_sor_dp_watermark_sst(nv_encoder, head, asyh); depth = nv50_dp_bpc_to_depth(asyh->or.bpc); if (nv_encoder->outp.or.link & 1) |