| Message ID | 20241114043040.1396947-1-suraj.kandpal@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [1/2] drm/i915/watermark: Refactor dpkgc code | expand |
Hi, I guess this is mostly ok. But some minor comments... On Thu, 2024-11-14 at 10:00 +0530, Suraj Kandpal wrote: > We move our dpkgc function for the below reasons: > - 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] > > Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> Probably some better clarity on the subject Something like drm/i915/display: Refactor handling of dpkgc latency programming Btw, i didn't find any patches with "drm/i915/watermark" on git log. > --- > 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); "dev_priv" is redundant here as we are supposed to use intel_display and you can get display from to_intel_display(state) in intel_program_dpkgc_latency > 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..620873d1244f 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 clear = 0, val = 0; No need to init these. > + u32 added_waketime = 0; > + int i; > + bool fixed_refresh_rate = false; Also pls place those variable declarations with initializations first and then the rest. > + > + if (DISPLAY_VER(display) < 20) > + return; > + > + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) { > + 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) I assume new_crtc_state->vrr.vmin/vmax/flipline etc are valid only if new_crtc_state->vrr.enable is true. I guess then it is better to keep the !new_crtc_state->vrr.enable as first condition 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); As mentioned before you don't need |= in these above statements > + > + 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;
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..620873d1244f 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 clear = 0, val = 0; + u32 added_waketime = 0; + int i; + bool fixed_refresh_rate = false; + + if (DISPLAY_VER(display) < 20) + return; + + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) { + 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) + 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;
We move our dpkgc function for the below reasons: - 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] Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> --- 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(-)