diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index b3a5c3f5ce14..42db41c8e3b3 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2874,7 +2874,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv, /* read the first set of memory latencies[0:3] */ val = 0; /* data0 to be programmed to 0 for first set */ - ret = snb_pcode_read(dev_priv, GEN9_PCODE_READ_MEM_LATENCY, + ret = snb_pcode_read(&dev_priv->uncore, GEN9_PCODE_READ_MEM_LATENCY, &val, NULL); if (ret) { @@ -2893,7 +2893,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv, /* read the second set of memory latencies[4:7] */ val = 1; /* data0 to be programmed to 1 for second set */ - ret = snb_pcode_read(dev_priv, GEN9_PCODE_READ_MEM_LATENCY, + ret = snb_pcode_read(&dev_priv->uncore, GEN9_PCODE_READ_MEM_LATENCY, &val, NULL); if (ret) { drm_err(&dev_priv->drm, @@ -3679,7 +3679,7 @@ intel_sagv_block_time(struct drm_i915_private *dev_priv) u32 val = 0; int ret; - ret = snb_pcode_read(dev_priv, + ret = snb_pcode_read(&dev_priv->uncore, GEN12_PCODE_READ_SAGV_BLOCK_TIME_US, &val, NULL); if (ret) { @@ -3748,7 +3748,7 @@ static void skl_sagv_enable(struct drm_i915_private *dev_priv) return; drm_dbg_kms(&dev_priv->drm, "Enabling SAGV\n"); - ret = snb_pcode_write(dev_priv, GEN9_PCODE_SAGV_CONTROL, + ret = snb_pcode_write(&dev_priv->uncore, GEN9_PCODE_SAGV_CONTROL, GEN9_SAGV_ENABLE); /* We don't need to wait for SAGV when enabling */ @@ -3781,7 +3781,7 @@ static void skl_sagv_disable(struct drm_i915_private *dev_priv) drm_dbg_kms(&dev_priv->drm, "Disabling SAGV\n"); /* bspec says to keep retrying for at least 1 ms */ - ret = skl_pcode_request(dev_priv, GEN9_PCODE_SAGV_CONTROL, + ret = skl_pcode_request(&dev_priv->uncore, GEN9_PCODE_SAGV_CONTROL, GEN9_SAGV_DISABLE, GEN9_SAGV_IS_DISABLED, GEN9_SAGV_IS_DISABLED, 1); @@ -5475,6 +5475,25 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state, } blocks = fixed16_to_u32_round_up(selected_result) + 1; + /* + * Lets have blocks at minimum equivalent to plane_blocks_per_line + * as there will be at minimum one line for lines configuration. This + * is a work around for FIFO underruns observed with resolutions like + * 4k 60 Hz in single channel DRAM configurations. + * + * As per the Bspec 49325, if the ddb allocation can hold at least + * one plane_blocks_per_line, we should have selected method2 in + * the above logic. Assuming that modern versions have enough dbuf + * and method2 guarantees blocks equivalent to at least 1 line, + * select the blocks as plane_blocks_per_line. + * + * TODO: Revisit the logic when we have better understanding on DRAM + * channels' impact on the level 0 memory latency and the relevant + * wm calculations. + */ + if (skl_wm_has_lines(dev_priv, level)) + blocks = max(blocks, + fixed16_to_u32_round_up(wp->plane_blocks_per_line)); lines = div_round_up_fixed16(selected_result, wp->plane_blocks_per_line); |