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d="scan'208";a="88813026" Received: from kandpal-x299-ud4-pro.iind.intel.com ([10.190.239.10]) by orviesa007.jf.intel.com with ESMTP; 14 Nov 2024 19:02:02 -0800 From: Suraj Kandpal To: intel-xe@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: vinod.govindapillai@intel.com, ville.syrjala@intel.com, Suraj Kandpal Subject: [PATCH 1/2] drm/i915/display: Refactor handling of dpkgc latency programming Date: Fri, 15 Nov 2024 08:31:52 +0530 Message-Id: <20241115030153.1418606-1-suraj.kandpal@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" - We want to make sure we have all the required values specially linetime which is computed after intel_wm_compute, this will also help implement some WA's which require linetime. -We do not want to write into any registers during compute_config phase While we are at it do some more refactors in the function like: -Use intel_display wherever possible -Move away from using enable_dpkgc bool and call it fixed_refresh_rate -Optimize value prepration --v2 -No need to save anything in intel_display structure [Vinod] -Move computation and writing into register to intel_atomic_commit_tail [Vinod] --v3 -Rename the subject [Vinod] -Rearrange the variable initialization and declaration [Vinod] -Reaarange condition evaluation for fixed_refresh_rate [Vinod] Signed-off-by: Suraj Kandpal --- drivers/gpu/drm/i915/display/intel_display.c | 2 + drivers/gpu/drm/i915/display/intel_wm.c | 57 ++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_wm.h | 2 + drivers/gpu/drm/i915/display/skl_watermark.c | 52 ------------------ 4 files changed, 61 insertions(+), 52 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index e790a2de5b3d..4f8e45a794bb 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -7826,6 +7826,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state) /* Now enable the clocks, plane, pipe, and connectors that we set up. */ dev_priv->display.funcs.display->commit_modeset_enables(state); + intel_program_dpkgc_latency(state, dev_priv); + if (state->modeset) intel_set_cdclk_post_plane_update(state); diff --git a/drivers/gpu/drm/i915/display/intel_wm.c b/drivers/gpu/drm/i915/display/intel_wm.c index d7dc49aecd27..d893403ff611 100644 --- a/drivers/gpu/drm/i915/display/intel_wm.c +++ b/drivers/gpu/drm/i915/display/intel_wm.c @@ -7,9 +7,18 @@ #include "i915_drv.h" #include "i9xx_wm.h" +#include "intel_de.h" #include "intel_display_types.h" #include "intel_wm.h" #include "skl_watermark.h" +#include "skl_watermark_regs.h" + +/* + * It is expected that DSB can do posted writes to every register in + * the pipe and planes within 100us. For flip queue use case, the + * recommended DSB execution time is 100us + one SAGV block time. + */ +#define DSB_EXE_TIME 100 /** * intel_update_watermarks - update FIFO watermark values based on current modes @@ -131,6 +140,54 @@ bool intel_wm_plane_visible(const struct intel_crtc_state *crtc_state, return plane_state->uapi.visible; } +/* + * If Fixed Refresh Rate or For VRR case Vmin = Vmax = Flipline: + * Program DEEP PKG_C_LATENCY Pkg C with highest valid latency from + * watermark level1 and up and above. If watermark level 1 is + * invalid program it with all 1's. + * Program PKG_C_LATENCY Added Wake Time = DSB execution time + * If Variable Refresh Rate where Vmin != Vmax != Flipline: + * Program DEEP PKG_C_LATENCY Pkg C with all 1's. + * Program PKG_C_LATENCY Added Wake Time = 0 + */ +void +intel_program_dpkgc_latency(struct intel_atomic_state *state, + struct drm_i915_private *i915) +{ + struct intel_display *display = to_intel_display(state); + struct intel_crtc *crtc; + struct intel_crtc_state *new_crtc_state; + u32 max_latency = LNL_PKG_C_LATENCY_MASK; + u32 added_waketime = 0; + bool fixed_refresh_rate = false; + u32 clear, val; + int i; + + if (DISPLAY_VER(display) < 20) + return; + + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) { + if (!new_crtc_state->vrr.enable || + (new_crtc_state->vrr.vmin == new_crtc_state->vrr.vmax && + new_crtc_state->vrr.vmin == new_crtc_state->vrr.flipline)) + fixed_refresh_rate = true; + } + + if (fixed_refresh_rate) { + max_latency = skl_watermark_max_latency(i915, 1); + if (max_latency == 0) + max_latency = LNL_PKG_C_LATENCY_MASK; + added_waketime = DSB_EXE_TIME + + display->sagv.block_time_us; + } + + clear = LNL_ADDED_WAKE_TIME_MASK | LNL_PKG_C_LATENCY_MASK; + val = REG_FIELD_PREP(LNL_PKG_C_LATENCY_MASK, max_latency) | + REG_FIELD_PREP(LNL_ADDED_WAKE_TIME_MASK, added_waketime); + + intel_de_rmw(display, LNL_PKG_C_LATENCY, clear, val); +} + void intel_print_wm_latency(struct drm_i915_private *dev_priv, const char *name, const u16 wm[]) { diff --git a/drivers/gpu/drm/i915/display/intel_wm.h b/drivers/gpu/drm/i915/display/intel_wm.h index e97cdca89a5c..f47e1354605d 100644 --- a/drivers/gpu/drm/i915/display/intel_wm.h +++ b/drivers/gpu/drm/i915/display/intel_wm.h @@ -31,5 +31,7 @@ void intel_print_wm_latency(struct drm_i915_private *i915, const char *name, const u16 wm[]); void intel_wm_init(struct drm_i915_private *i915); void intel_wm_debugfs_register(struct drm_i915_private *i915); +void intel_program_dpkgc_latency(struct intel_atomic_state *state, + struct drm_i915_private *i915); #endif /* __INTEL_WM_H__ */ diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c index 1a4c1fa24820..d419edb196c6 100644 --- a/drivers/gpu/drm/i915/display/skl_watermark.c +++ b/drivers/gpu/drm/i915/display/skl_watermark.c @@ -28,12 +28,6 @@ #include "skl_watermark.h" #include "skl_watermark_regs.h" -/*It is expected that DSB can do posted writes to every register in - * the pipe and planes within 100us. For flip queue use case, the - * recommended DSB execution time is 100us + one SAGV block time. - */ -#define DSB_EXE_TIME 100 - static void skl_sagv_disable(struct drm_i915_private *i915); /* Stores plane specific WM parameters */ @@ -2844,51 +2838,12 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state, return 0; } -/* - * If Fixed Refresh Rate or For VRR case Vmin = Vmax = Flipline: - * Program DEEP PKG_C_LATENCY Pkg C with highest valid latency from - * watermark level1 and up and above. If watermark level 1 is - * invalid program it with all 1's. - * Program PKG_C_LATENCY Added Wake Time = DSB execution time - * If Variable Refresh Rate where Vmin != Vmax != Flipline: - * Program DEEP PKG_C_LATENCY Pkg C with all 1's. - * Program PKG_C_LATENCY Added Wake Time = 0 - */ -static void -skl_program_dpkgc_latency(struct drm_i915_private *i915, bool enable_dpkgc) -{ - u32 max_latency = 0; - u32 clear = 0, val = 0; - u32 added_wake_time = 0; - - if (DISPLAY_VER(i915) < 20) - return; - - if (enable_dpkgc) { - max_latency = skl_watermark_max_latency(i915, 1); - if (max_latency == 0) - max_latency = LNL_PKG_C_LATENCY_MASK; - added_wake_time = DSB_EXE_TIME + - i915->display.sagv.block_time_us; - } else { - max_latency = LNL_PKG_C_LATENCY_MASK; - added_wake_time = 0; - } - - clear |= LNL_ADDED_WAKE_TIME_MASK | LNL_PKG_C_LATENCY_MASK; - val |= REG_FIELD_PREP(LNL_PKG_C_LATENCY_MASK, max_latency); - val |= REG_FIELD_PREP(LNL_ADDED_WAKE_TIME_MASK, added_wake_time); - - intel_uncore_rmw(&i915->uncore, LNL_PKG_C_LATENCY, clear, val); -} - static int skl_compute_wm(struct intel_atomic_state *state) { struct intel_crtc *crtc; struct intel_crtc_state __maybe_unused *new_crtc_state; int ret, i; - bool enable_dpkgc = false; for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) { ret = skl_build_pipe_wm(state, crtc); @@ -2913,15 +2868,8 @@ skl_compute_wm(struct intel_atomic_state *state) ret = skl_wm_add_affected_planes(state, crtc); if (ret) return ret; - - if ((new_crtc_state->vrr.vmin == new_crtc_state->vrr.vmax && - new_crtc_state->vrr.vmin == new_crtc_state->vrr.flipline) || - !new_crtc_state->vrr.enable) - enable_dpkgc = true; } - skl_program_dpkgc_latency(to_i915(state->base.dev), enable_dpkgc); - skl_print_wm_changes(state); return 0;