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mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DM4PR11MB5341.namprd11.prod.outlook.com (2603:10b6:5:390::22) by DM6PR11MB4753.namprd11.prod.outlook.com (2603:10b6:5:2ac::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9412.13; Tue, 16 Dec 2025 12:35:53 +0000 Received: from DM4PR11MB5341.namprd11.prod.outlook.com ([fe80::397:7566:d626:e839]) by DM4PR11MB5341.namprd11.prod.outlook.com ([fe80::397:7566:d626:e839%7]) with mapi id 15.20.9434.001; Tue, 16 Dec 2025 12:35:50 +0000 Message-ID: <2f4c633b-e8d1-411c-95b8-d382e5b9a314@intel.com> Date: Tue, 16 Dec 2025 18:05:43 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 15/17] drm/i915/vrr: Pause DC Balancing for DSB commits To: Mitul Golani , CC: , , , References: <20251202073659.926838-1-mitulkumar.ajitkumar.golani@intel.com> <20251202073659.926838-16-mitulkumar.ajitkumar.golani@intel.com> Content-Language: en-US From: "Nautiyal, Ankit K" In-Reply-To: <20251202073659.926838-16-mitulkumar.ajitkumar.golani@intel.com> Content-Type: text/plain; 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(Ankit) > - Separate vrr enable structuring. (Ankit) > > --v3: > - Add gaurd before accessing DC balance bits. > - Remove redundancy checks. > > --v4: > - Move events to separate function. > > Signed-off-by: Ville Syrjälä > Signed-off-by: Mitul Golani Reviewed-by: Ankit Nautiyal > --- > drivers/gpu/drm/i915/display/intel_display.c | 19 +++++++++++++++++++ > drivers/gpu/drm/i915/display/intel_vrr.c | 3 +++ > 2 files changed, 22 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c > index f9a779c555cc..3dbad592832e 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -7321,6 +7321,21 @@ static void intel_atomic_dsb_finish(struct intel_atomic_state *state, > if (new_crtc_state->use_flipq) > intel_flipq_wait_dmc_halt(new_crtc_state->dsb_commit, crtc); > > + if (new_crtc_state->vrr.dc_balance.enable) { > + /* > + * Pause the DMC DC balancing for the remainder of > + * the commit so that vmin/vmax won't change after > + * we've baked them into the DSB vblank evasion > + * commands. > + * > + * FIXME maybe need a small delay here to make sure > + * DMC has finished updating the values? Or we need > + * a better DMC<->driver protocol that gives is real > + * guarantees about that... > + */ > + intel_pipedmc_dcb_disable(NULL, crtc); > + } > + > if (intel_crtc_needs_color_update(new_crtc_state)) > intel_color_commit_noarm(new_crtc_state->dsb_commit, > new_crtc_state); > @@ -7374,6 +7389,10 @@ static void intel_atomic_dsb_finish(struct intel_atomic_state *state, > intel_dsb_wait_for_delayed_vblank(state, new_crtc_state->dsb_commit); > intel_vrr_check_push_sent(new_crtc_state->dsb_commit, > new_crtc_state); > + > + if (new_crtc_state->vrr.dc_balance.enable) > + intel_pipedmc_dcb_enable(new_crtc_state->dsb_commit, crtc); > + > intel_dsb_interrupt(new_crtc_state->dsb_commit); > } > > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c > index 4c1470dcd3bb..38dc4f87e6fe 100644 > --- a/drivers/gpu/drm/i915/display/intel_vrr.c > +++ b/drivers/gpu/drm/i915/display/intel_vrr.c > @@ -10,6 +10,7 @@ > #include "intel_de.h" > #include "intel_display_regs.h" > #include "intel_display_types.h" > +#include "intel_dmc.h" > #include "intel_dmc_regs.h" > #include "intel_dp.h" > #include "intel_psr.h" > @@ -824,6 +825,7 @@ intel_vrr_enable_dc_balancing(const struct intel_crtc_state *crtc_state) > crtc_state->vrr.dc_balance.vblank_target); > intel_de_write(display, TRANS_ADAPTIVE_SYNC_DCB_CTL(cpu_transcoder), > ADAPTIVE_SYNC_COUNTER_EN); > + intel_pipedmc_dcb_enable(NULL, crtc); > } > > static void > @@ -837,6 +839,7 @@ intel_vrr_disable_dc_balancing(const struct intel_crtc_state *old_crtc_state) > if (!old_crtc_state->vrr.dc_balance.enable) > return; > > + intel_pipedmc_dcb_disable(NULL, crtc); > intel_de_write(display, TRANS_ADAPTIVE_SYNC_DCB_CTL(cpu_transcoder), 0); > intel_de_write(display, PIPEDMC_DCB_VMIN(pipe), 0); > intel_de_write(display, PIPEDMC_DCB_VMAX(pipe), 0);