From: Mahesh Kumar Date: Mon, 9 Apr 2018 09:11:06 +0530 Subject: drm/i915/skl+: make sure higher latency level has higher wm value Git-commit: 8b2b53ce94e808ef9340add94c4c50b9e5267413 Patch-mainline: v4.18-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 DDB allocation optimization algorithm requires/assumes ddb allocation for any memory C-state level DDB value to be as high as level below the current level. Render decompression requires level WM to be as high as wm level-0. This patch fulfils both the requirements. v2: Changed plane_num to plane_id in skl_compute_wm_levels v3: Addressed review comments from Shashank Sharma Changed the commit message "statement can be more clear, "DDB value to be as high as level below " what is level below ?" v4: Added reviewed by tag from Shashank Sharma v5: Added reviewed by from Juha-Pekka Heikkila v6: Rebased the series Reviewed-by: Juha-Pekka Heikkila Reviewed-by: Shashank Sharma Signed-off-by: Mahesh Kumar Reviewed-by: Maarten Lankhorst Signed-off-by: Maarten Lankhorst Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-8-git-send-email-vidya.srinivas@intel.com Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/intel_pm.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4529,6 +4529,7 @@ static int skl_compute_plane_wm(const st uint16_t ddb_allocation, int level, const struct skl_wm_params *wp, + const struct skl_wm_level *result_prev, struct skl_wm_level *result /* out */) { const struct drm_plane_state *pstate = &intel_pstate->base; @@ -4596,6 +4597,15 @@ static int skl_compute_plane_wm(const st } else { res_blocks++; } + + /* + * Make sure result blocks for higher latency levels are atleast + * as high as level below the current level. + * Assumption in DDB algorithm optimization for special cases. + * Also covers Display WA #1125 for RC. + */ + if (result_prev->plane_res_b > res_blocks) + res_blocks = result_prev->plane_res_b; } if (INTEL_GEN(dev_priv) >= 11) { @@ -4679,6 +4689,13 @@ skl_compute_wm_levels(const struct drm_i for (level = 0; level <= max_level; level++) { struct skl_wm_level *result = plane_id ? &wm->uv_wm[level] : &wm->wm[level]; + struct skl_wm_level *result_prev; + + if (level) + result_prev = plane_id ? &wm->uv_wm[level - 1] : + &wm->wm[level - 1]; + else + result_prev = plane_id ? &wm->uv_wm[0] : &wm->wm[0]; ret = skl_compute_plane_wm(dev_priv, cstate, @@ -4686,6 +4703,7 @@ skl_compute_wm_levels(const struct drm_i ddb_blocks, level, wm_params, + result_prev, result); if (ret) return ret;