From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4787BC54F56 for ; Tue, 28 Jul 2026 15:11:28 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2B6B010E94F; Tue, 28 Jul 2026 15:11:26 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ILcLaCkj"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9738A10E926; Tue, 28 Jul 2026 15:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785251485; x=1816787485; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=80YikCK21YQb+r524cZ8QZTBBCJJFNf7699Nt5zuCKs=; b=ILcLaCkjn73FclemIPf9QLU7DP/JInpjCuDzvilqITHLpWL70UzGcBLu P6W7toCwq+yrz8gPpUqapJrO0J6Y4TABCRqYlayHyvFwkKAcgBD4b9LKO CspPM9Xt+a3QA6WGZHV73RYSrkT9ajgQXWaUyKZUyIAOqbS8vrA4OWhI2 Oc5RKwkuId0B2bTIfCNHI4pADMLKETBd00dexc41AUg4U0wn7gy+47tjh 1OKLEiBzOezQ0R78LVm+eYlILSGASnyW+hwJZsD8pNKIPz2PIukrO7bw5 LWTwxa6lrZFNm+0odPm90O1RKnGxOBNZJJE/HS5SxqvR+DPNj6He88zv4 g==; X-CSE-ConnectionGUID: FcItPFZoRoKH2xDQ6rrivQ== X-CSE-MsgGUID: BBF5XAhDSdaQNo57uirKqw== X-IronPort-AV: E=McAfee;i="6800,10657,11859"; a="88376958" X-IronPort-AV: E=Sophos;i="6.25,190,1779174000"; d="scan'208";a="88376958" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jul 2026 08:10:12 -0700 X-CSE-ConnectionGUID: c/sxYMJbToOYH8Eq/vgO/A== X-CSE-MsgGUID: JsnloefpTLaYL2zDvQHbZg== X-ExtLoop1: 1 Received: from mgolanimitul-x299-ud4-pro.iind.intel.com ([10.190.239.114]) by fmviesa003.fm.intel.com with ESMTP; 28 Jul 2026 08:10:10 -0700 From: Mitul Golani To: intel-gfx@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, uma.shankar@intel.com, ankit.k.nautiyal@intel.com, chaitanya.kumar.borah@intel.com Subject: [PATCH v7 08/10] drm/i915/vrr: Program CMRR enable/disable from transcoder timings Date: Tue, 28 Jul 2026 20:29:40 +0530 Message-ID: <20260728145943.3848704-9-mitulkumar.ajitkumar.golani@intel.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20260728145943.3848704-1-mitulkumar.ajitkumar.golani@intel.com> References: <20260728145943.3848704-1-mitulkumar.ajitkumar.golani@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" Split the CMRR M/N register programming into intel_vrr_enable_cmrr() and intel_vrr_disable_cmrr(), and drive them from intel_vrr_set_fixed_rr_timings() based on crtc_state->vrr.cmrr.enable. VRR_CTL_CMRR_ENABLE is not set explicitly, writing TRANS_CMRR_N_HI arms CMRR in hardware. Drop the now-unused cmrr_enable argument to intel_vrr_tg_enable(). No functional change intended for non-CMRR configurations. --v2: - Commit message changes. - Added Simplified enable/disable sequence. (Chaitanya) --v3: - Guard CMRR enable condition (Chaitanya) - Comment changes updated (Chaitanya) - Squash register write commits together and avoid double writing issue. (Chaitanya) --v4: - Guard CMRR enable/disable with platform check --v5: - Update CMRR in enable/disable path --v6: - Simplify enable/disable calls (Chaitanya) - Make function usable for common cmtg and cpu transcoder (Chaitanya) Signed-off-by: Mitul Golani Assisted-by: Claude:claude-opus-4-8 --- drivers/gpu/drm/i915/display/intel_vrr.c | 59 ++++++++++++++++-------- 1 file changed, 40 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c index 056d513ab637..8d871aa58cab 100644 --- a/drivers/gpu/drm/i915/display/intel_vrr.c +++ b/drivers/gpu/drm/i915/display/intel_vrr.c @@ -352,6 +352,36 @@ int intel_vrr_fixed_rr_hw_flipline(const struct intel_crtc_state *crtc_state) return intel_vrr_fixed_rr_hw_vtotal(crtc_state); } +static void +intel_vrr_set_cmrr_timings(const struct intel_crtc_state *crtc_state, + enum transcoder transcoder) +{ + struct intel_display *display = to_intel_display(crtc_state); + + if (!intel_vrr_cmrr_possible(crtc_state)) + return; + + intel_de_write(display, TRANS_CMRR_M_HI(display, transcoder), + upper_32_bits(crtc_state->vrr.cmrr.cmrr_m)); + intel_de_write(display, TRANS_CMRR_M_LO(display, transcoder), + lower_32_bits(crtc_state->vrr.cmrr.cmrr_m)); + intel_de_write(display, TRANS_CMRR_N_LO(display, transcoder), + lower_32_bits(crtc_state->vrr.cmrr.cmrr_n)); + intel_de_write(display, TRANS_CMRR_N_HI(display, transcoder), + upper_32_bits(crtc_state->vrr.cmrr.cmrr_n)); + + /* + * On always-VRR-TG platforms the fastset path does not rewrite the + * whole TRANS_VRR_CTL, so RMW only the CMRR enable bit here. On a + * modeset the authoritative writes (intel_vrr_tg_enable(), + * intel_cmtg_set_vrr_ctl()) carry the same bit, so this stays + * consistent. + */ + intel_de_rmw(display, TRANS_VRR_CTL(display, transcoder), + VRR_CTL_CMRR_ENABLE, + crtc_state->vrr.cmrr.enable ? VRR_CTL_CMRR_ENABLE : 0); +} + void intel_vrr_set_fixed_rr_timings(const struct intel_crtc_state *crtc_state, enum transcoder transcoder) { @@ -360,6 +390,8 @@ void intel_vrr_set_fixed_rr_timings(const struct intel_crtc_state *crtc_state, if (!intel_vrr_possible(crtc_state)) return; + intel_vrr_set_cmrr_timings(crtc_state, transcoder); + intel_de_write(display, TRANS_VRR_VMIN(display, transcoder), intel_vrr_fixed_rr_hw_vmin(crtc_state) - 1); intel_de_write(display, TRANS_VRR_VMAX(display, transcoder), @@ -671,17 +703,6 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state) return; } - if (crtc_state->vrr.cmrr.enable) { - intel_de_write(display, TRANS_CMRR_M_HI(display, cpu_transcoder), - upper_32_bits(crtc_state->vrr.cmrr.cmrr_m)); - intel_de_write(display, TRANS_CMRR_M_LO(display, cpu_transcoder), - lower_32_bits(crtc_state->vrr.cmrr.cmrr_m)); - intel_de_write(display, TRANS_CMRR_N_HI(display, cpu_transcoder), - upper_32_bits(crtc_state->vrr.cmrr.cmrr_n)); - intel_de_write(display, TRANS_CMRR_N_LO(display, cpu_transcoder), - lower_32_bits(crtc_state->vrr.cmrr.cmrr_n)); - } - intel_vrr_set_fixed_rr_timings(crtc_state, cpu_transcoder); intel_cmtg_set_vrr_timings(crtc_state); @@ -947,8 +968,7 @@ intel_vrr_disable_dc_balancing(const struct intel_crtc_state *old_crtc_state) intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), vrr_ctl); } -static void intel_vrr_tg_enable(const struct intel_crtc_state *crtc_state, - bool cmrr_enable) +static void intel_vrr_tg_enable(const struct intel_crtc_state *crtc_state) { struct intel_display *display = to_intel_display(crtc_state); enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; @@ -960,11 +980,12 @@ static void intel_vrr_tg_enable(const struct intel_crtc_state *crtc_state, vrr_ctl = VRR_CTL_VRR_ENABLE | trans_vrr_ctl(crtc_state); /* - * FIXME this might be broken as bspec seems to imply that - * even VRR_CTL_CMRR_ENABLE is armed by TRANS_CMRR_N_HI - * when enabling CMRR (but not when disabling CMRR?). + * This full TRANS_VRR_CTL write is the authoritative one, so it must + * carry VRR_CTL_CMRR_ENABLE when CMRR is in use. Writing TRANS_CMRR_N_HI + * arms the bit in hardware, but this later write would otherwise clear + * it again. */ - if (cmrr_enable) + if (crtc_state->vrr.cmrr.enable) vrr_ctl |= VRR_CTL_CMRR_ENABLE; intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), vrr_ctl); @@ -1000,7 +1021,7 @@ void intel_vrr_enable(const struct intel_crtc_state *crtc_state) intel_vrr_enable_dc_balancing(crtc_state); if (!intel_vrr_always_use_vrr_tg(display)) - intel_vrr_tg_enable(crtc_state, crtc_state->vrr.cmrr.enable); + intel_vrr_tg_enable(crtc_state); } void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state) @@ -1027,7 +1048,7 @@ void intel_vrr_transcoder_enable(const struct intel_crtc_state *crtc_state) return; if (intel_vrr_always_use_vrr_tg(display)) - intel_vrr_tg_enable(crtc_state, false); + intel_vrr_tg_enable(crtc_state); } void intel_vrr_transcoder_disable(const struct intel_crtc_state *old_crtc_state) -- 2.48.1