From patchwork Thu Sep 19 13:31:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun R Murthy X-Patchwork-Id: 13807753 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 84E0FCF3943 for ; Thu, 19 Sep 2024 13:41:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 10DF110E6FB; Thu, 19 Sep 2024 13:41:33 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="IsQRl36V"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 85E4410E6F8; Thu, 19 Sep 2024 13:41:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1726753292; x=1758289292; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=SI5H8KsoMqAQLlBCakOkZ6y4mpkj+fyWin2xUnIQxV4=; b=IsQRl36VCyMmlUUwWWIV0dErCp4FvNythp2bJRr75CKI2pliuEdCTfki XY+shNQ4GHG4LKmiCKAQBT0dsZL5E09oNSTkjesp/uSVC2rZMJmy0ipil VSESiJ9tpI0MM90WxyKUKKQaqJn091vP70Wnj13bHbEqFm5xhIB3XGX6u QXp+IX36/zHxmNDePyWAZkENkGrX2+MxVkUQkMVnu3vqLDVBKBaZ+hhQv YZFsfe7xSkBF+IvPesb2ksdNOTHtHpldDkVeY54R+GB9EExtLvYADen5m VJ61TMbVkrmixdoMZNbo8gHg3NNE/ELSIPTJIOeoDBfMemCDb3nQ2PhaA w==; X-CSE-ConnectionGUID: 39I0/elgQbeVoIfhM9yEYw== X-CSE-MsgGUID: EIHF+n/yTZCrj9WXTtAd9A== X-IronPort-AV: E=McAfee;i="6700,10204,11199"; a="29505353" X-IronPort-AV: E=Sophos;i="6.10,241,1719903600"; d="scan'208";a="29505353" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2024 06:41:32 -0700 X-CSE-ConnectionGUID: 3E1iZnM8Sou8GugG9ct6tA== X-CSE-MsgGUID: o+rS3Yj9RJCew/q9bG0HBA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,241,1719903600"; d="scan'208";a="74912648" Received: from srr4-3-linux-106-armuthy.iind.intel.com ([10.190.238.56]) by orviesa004.jf.intel.com with ESMTP; 19 Sep 2024 06:41:29 -0700 From: Arun R Murthy To: intel-xe@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Arun R Murthy Subject: [PATCHv3 3/6] drm/i915/histogram: histogram interrupt handling Date: Thu, 19 Sep 2024 19:01:37 +0530 Message-Id: <20240919133140.1372663-4-arun.r.murthy@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240919133140.1372663-1-arun.r.murthy@intel.com> References: <20240919133140.1372663-1-arun.r.murthy@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Upon enabling histogram an interrupt is trigerred after the generation of the statistics. This patch registers the histogram interrupt and handles the interrupt. v2: Added intel_crtc backpointer to intel_histogram struct (Jani) Removed histogram_wq and instead use dev_priv->unodered_eq (Jani) v3: Replaced drm_i915_private with intel_display (Suraj) Refactored the histogram read code (Jani) Signed-off-by: Arun R Murthy --- .../gpu/drm/i915/display/intel_display_irq.c | 6 +- .../gpu/drm/i915/display/intel_histogram.c | 93 +++++++++++++++++++ .../gpu/drm/i915/display/intel_histogram.h | 3 + drivers/gpu/drm/i915/i915_reg.h | 5 +- 4 files changed, 104 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c index 8f13f148c73e..930eb2ed17a6 100644 --- a/drivers/gpu/drm/i915/display/intel_display_irq.c +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c @@ -20,6 +20,7 @@ #include "intel_fdi_regs.h" #include "intel_fifo_underrun.h" #include "intel_gmbus.h" +#include "intel_histogram.h" #include "intel_hotplug_irq.h" #include "intel_pipe_crc_regs.h" #include "intel_pmdemand.h" @@ -1190,6 +1191,9 @@ void gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl) if (iir & gen8_de_pipe_underrun_mask(dev_priv)) intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe); + if (iir & GEN9_PIPE_HISTOGRAM_EVENT) + intel_histogram_irq_handler(display, pipe); + fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv); if (fault_errors) drm_err_ratelimited(&dev_priv->drm, @@ -1721,7 +1725,7 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv) struct intel_uncore *uncore = &dev_priv->uncore; u32 de_pipe_masked = gen8_de_pipe_fault_mask(dev_priv) | - GEN8_PIPE_CDCLK_CRC_DONE; + GEN8_PIPE_CDCLK_CRC_DONE | GEN9_PIPE_HISTOGRAM_EVENT; u32 de_pipe_enables; u32 de_port_masked = gen8_de_port_aux_mask(dev_priv); u32 de_port_enables; diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c index bf9ffb1b8bfb..ed3f455666aa 100644 --- a/drivers/gpu/drm/i915/display/intel_histogram.c +++ b/drivers/gpu/drm/i915/display/intel_histogram.c @@ -18,6 +18,8 @@ #define HISTOGRAM_GUARDBAND_THRESHOLD_DEFAULT 300 // 3.0% of the pipe's current pixel count. #define HISTOGRAM_GUARDBAND_PRECISION_FACTOR 10000 // Precision factor for threshold guardband. #define HISTOGRAM_DEFAULT_GUARDBAND_DELAY 0x04 +#define HISTOGRAM_BIN_READ_RETRY_COUNT 5 +#define HISTOGRAM_BIN_READ_DELAY 2 struct intel_histogram { struct intel_crtc *crtc; @@ -27,6 +29,92 @@ struct intel_histogram { u32 bindata[HISTOGRAM_BIN_COUNT]; }; +static bool intel_histogram_get_data(struct intel_crtc *intel_crtc) +{ + struct intel_display *display = to_intel_display(intel_crtc); + struct intel_histogram *histogram = intel_crtc->histogram; + u8 index, retry_count; + u32 dpstbin; + + index = 0; + retry_count = 0; + + while (index < HISTOGRAM_BIN_COUNT) { + dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe)); + if (!(dpstbin & DPST_BIN_BUSY)) { + histogram->bindata[index] = dpstbin & DPST_BIN_DATA_MASK; + index++; + } else { + /* + * If DPST_BIN busy bit is set, then set the + * DPST_CTL bin reg index to 0 and proceed + * from beginning. + */ + retry_count++; + if (retry_count > HISTOGRAM_BIN_READ_RETRY_COUNT) { + drm_err(display->drm, "Histogram bin read failed with max retry\n"); + return false; + } + /* Add a delay before retrying */ + fsleep(HISTOGRAM_BIN_READ_DELAY); + index = 0; + intel_de_rmw(display, DPST_CTL(intel_crtc->pipe), + DPST_CTL_BIN_REG_FUNC_SEL | + DPST_CTL_BIN_REG_MASK, 0); + } + } + return true; +} + +static void intel_histogram_handle_int_work(struct work_struct *work) +{ + struct intel_histogram *histogram = container_of(work, + struct intel_histogram, histogram_int_work.work); + struct intel_crtc *intel_crtc = histogram->crtc; + struct intel_display *display = to_intel_display(intel_crtc); + char *histogram_event[] = {"HISTOGRAM=1", NULL}; + + /* + * TODO: PSR to be exited while reading the Histogram data + * Set DPST_CTL Bin Reg function select to TC + * Set DPST_CTL Bin Register Index to 0 + */ + intel_de_rmw(display, DPST_CTL(intel_crtc->pipe), + DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK, 0); + if (intel_histogram_get_data(intel_crtc)) { + /* Notify user for Histogram rediness */ + if (kobject_uevent_env(&display->drm->primary->kdev->kobj, + KOBJ_CHANGE, histogram_event)) + drm_err(display->drm, + "sending HISTOGRAM event failed\n"); + } + + /* Enable histogram interrupt */ + intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe), DPST_GUARD_HIST_INT_EN, + DPST_GUARD_HIST_INT_EN); + + /* Clear histogram interrupt by setting histogram interrupt status bit*/ + intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe), + DPST_GUARD_HIST_EVENT_STATUS, 1); +} + +void intel_histogram_irq_handler(struct intel_display *display, enum pipe pipe) +{ + struct intel_crtc *intel_crtc = + to_intel_crtc(drm_crtc_from_index(display->drm, pipe)); + struct intel_histogram *histogram = intel_crtc->histogram; + struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev); + + if (!histogram->enable) { + drm_err(display->drm, + "spurious interrupt, histogram not enabled\n"); + return; + } + + queue_delayed_work(i915->unordered_wq, + &histogram->histogram_int_work, 0); +} + int intel_histogram_atomic_check(struct intel_crtc *intel_crtc) { struct intel_histogram *histogram = intel_crtc->histogram; @@ -118,6 +206,7 @@ static void intel_histogram_disable(struct intel_crtc *intel_crtc) intel_de_rmw(display, DPST_CTL(pipe), DPST_CTL_IE_HIST_EN, 0); + cancel_delayed_work(&histogram->histogram_int_work); histogram->enable = false; } @@ -179,6 +268,7 @@ void intel_histogram_deinit(struct intel_crtc *intel_crtc) { struct intel_histogram *histogram = intel_crtc->histogram; + cancel_delayed_work_sync(&histogram->histogram_int_work); kfree(histogram); } @@ -196,5 +286,8 @@ int intel_histogram_init(struct intel_crtc *intel_crtc) histogram->crtc = intel_crtc; histogram->can_enable = false; + INIT_DEFERRABLE_WORK(&histogram->histogram_int_work, + intel_histogram_handle_int_work); + return 0; } diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h b/drivers/gpu/drm/i915/display/intel_histogram.h index 8de7d0ed5923..fee1715b4235 100644 --- a/drivers/gpu/drm/i915/display/intel_histogram.h +++ b/drivers/gpu/drm/i915/display/intel_histogram.h @@ -9,6 +9,8 @@ #include struct intel_crtc; +struct intel_display; +enum pipe; #define HISTOGRAM_BIN_COUNT 32 #define HISTOGRAM_IET_LENGTH 33 @@ -27,6 +29,7 @@ enum intel_global_hist_lut { }; int intel_histogram_atomic_check(struct intel_crtc *intel_crtc); +void intel_histogram_irq_handler(struct intel_display *display, enum pipe pipe); int intel_histogram_update(struct intel_crtc *intel_crtc, bool enable); int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data); int intel_histogram_init(struct intel_crtc *intel_crtc); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 41f4350a7c6c..a18cfef3ab21 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1655,7 +1655,7 @@ #define PIPE_HOTPLUG_INTERRUPT_ENABLE (1UL << 26) #define PIPE_VSYNC_INTERRUPT_ENABLE (1UL << 25) #define PIPE_DISPLAY_LINE_COMPARE_ENABLE (1UL << 24) -#define PIPE_DPST_EVENT_ENABLE (1UL << 23) +#define PIPE_HISTOGRAM_EVENT_ENABLE (1UL << 23) #define SPRITE0_FLIP_DONE_INT_EN_VLV (1UL << 22) #define PIPE_LEGACY_BLC_EVENT_ENABLE (1UL << 22) #define PIPE_ODD_FIELD_INTERRUPT_ENABLE (1UL << 21) @@ -1678,7 +1678,7 @@ #define PIPE_HOTPLUG_INTERRUPT_STATUS (1UL << 10) #define PIPE_VSYNC_INTERRUPT_STATUS (1UL << 9) #define PIPE_DISPLAY_LINE_COMPARE_STATUS (1UL << 8) -#define PIPE_DPST_EVENT_STATUS (1UL << 7) +#define PIPE_HISTOGRAM_EVENT_STATUS (1UL << 7) #define PIPE_A_PSR_STATUS_VLV (1UL << 6) #define PIPE_LEGACY_BLC_EVENT_STATUS (1UL << 6) #define PIPE_ODD_FIELD_INTERRUPT_STATUS (1UL << 5) @@ -2520,6 +2520,7 @@ #define GEN12_DSB_1_INT REG_BIT(14) /* tgl+ */ #define GEN12_DSB_0_INT REG_BIT(13) /* tgl+ */ #define GEN12_DSB_INT(dsb_id) REG_BIT(13 + (dsb_id)) +#define GEN9_PIPE_HISTOGRAM_EVENT REG_BIT(12) /* skl+ */ #define GEN9_PIPE_CURSOR_FAULT REG_BIT(11) /* skl+ */ #define GEN9_PIPE_PLANE4_FAULT REG_BIT(10) /* skl+ */ #define GEN8_PIPE_CURSOR_FAULT REG_BIT(10) /* bdw */