From patchwork Mon Oct 31 22:56:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Srivatsa, Anusha" X-Patchwork-Id: 13026447 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 D253EFA3746 for ; Mon, 31 Oct 2022 22:56:43 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CFB5C10E230; Mon, 31 Oct 2022 22:56:42 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9022410E235 for ; Mon, 31 Oct 2022 22:56:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667257000; x=1698793000; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=8v/u0ihCrWabXh+la3Ye+5kbCPLzp8DJmr7I5UYeR0s=; b=a574hHTKis4YywxWvd2z33l+kV5QTEbch3SKnUJCxrKEWNP0VZZaIQln yrMkPfgep+zvqVe4V3FBsBty/4mBH8vAfKvCIqwDmUzc6OiAzPwICpXy+ RyMbj2a6cR+a7nv4VwQQSKkC//wPhKf84SSJHLIPjsJo8dEbRfICjz7bU pawri1dLufDh4avyRZzyr6PgMpAAFG7PUl1KgznooxQTuuUCrClYTcHFp 5cbTUMdeWM/JrYqhdmBXZDi7zmykfzAHjg4iVqeUx/WdcishFgkv9xfX8 jEuxyklbdEd2QLzF1Exl+siqp69lAuYeTp5Khl+IAbaVdOiPOj2xRvYEO g==; X-IronPort-AV: E=McAfee;i="6500,9779,10517"; a="335679205" X-IronPort-AV: E=Sophos;i="5.95,229,1661842800"; d="scan'208";a="335679205" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Oct 2022 15:56:39 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10517"; a="584819769" X-IronPort-AV: E=Sophos;i="5.95,229,1661842800"; d="scan'208";a="584819769" Received: from anushasr-mobl7.jf.intel.com ([10.24.14.130]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Oct 2022 15:56:37 -0700 From: Anusha Srivatsa To: intel-gfx@lists.freedesktop.org Date: Mon, 31 Oct 2022 15:56:47 -0700 Message-Id: <20221031225648.552363-1-anusha.srivatsa@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 1/2] drm/i915/display: Do both crawl and squash when changing cdclk 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: , Cc: Balasubramani Vivekanandan Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Ville Syrjälä For MTL, changing cdclk from between certain frequencies has both squash and crawl. Use the current cdclk config and the new(desired) cdclk config to construtc a mid cdclk config. Set the cdclk twice: - Current cdclk -> mid cdclk - mid cdclk -> desired cdclk v2: Add check in intel_modeset_calc_cdclk() to avoid cdclk change via modeset for platforms that support squash_crawl sequences(Ville) v3: Add checks for: - scenario where only slow clock is used and cdclk is actually 0 (bringing up display). - PLLs are on before looking up the waveform. - Squash and crawl capability checks.(Ville) v4: Rebase - Move checks to be more consistent (Ville) - Add comments (Bala) v5: - Further small changes. Move checks around. - Make if-else better looking (Ville) Cc: Balasubramani Vivekanandan Signed-off-by: Anusha Srivatsa Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/i915/display/intel_cdclk.c | 156 +++++++++++++++++---- 1 file changed, 128 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c index eada931cb1c8..d79cf282faa8 100644 --- a/drivers/gpu/drm/i915/display/intel_cdclk.c +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c @@ -1716,37 +1716,74 @@ static void dg2_cdclk_squash_program(struct drm_i915_private *i915, intel_de_write(i915, CDCLK_SQUASH_CTL, squash_ctl); } -static void bxt_set_cdclk(struct drm_i915_private *dev_priv, - const struct intel_cdclk_config *cdclk_config, - enum pipe pipe) +static int cdclk_squash_divider(u16 waveform) +{ + return hweight16(waveform ?: 0xffff); +} + +static bool cdclk_crawl_and_squash(struct drm_i915_private *i915, + const struct intel_cdclk_config *old_cdclk_config, + const struct intel_cdclk_config *new_cdclk_config, + struct intel_cdclk_config *mid_cdclk_config) +{ + u16 old_waveform, new_waveform, mid_waveform; + int size = 16; + int div = 2; + + /* Return if both Squash and Crawl are not present */ + if (!HAS_CDCLK_CRAWL(i915) || !HAS_CDCLK_SQUASH(i915)) + return false; + + old_waveform = cdclk_squash_waveform(i915, old_cdclk_config->cdclk); + new_waveform = cdclk_squash_waveform(i915, new_cdclk_config->cdclk); + + /* Return if Squash only or Crawl only is the desired action */ + if (old_cdclk_config->vco <= 0 || new_cdclk_config->vco <= 0 || + old_cdclk_config->vco == new_cdclk_config->vco || + old_waveform == new_waveform) + return false; + + *mid_cdclk_config = *new_cdclk_config; + + /* Populate the mid_cdclk_config accordingly. + * - If moving to a higher cdclk, the desired action is squashing. + * The mid cdclk config should have the new (squash) waveform. + * - If moving to a lower cdclk, the desired action is crawling. + * The mid cdclk config should have the new vco. + */ + + if (cdclk_squash_divider(new_waveform) > cdclk_squash_divider(old_waveform)) { + mid_cdclk_config->vco = old_cdclk_config->vco; + mid_waveform = new_waveform; + } else { + mid_cdclk_config->vco = new_cdclk_config->vco; + mid_waveform = old_waveform; + } + + mid_cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_squash_divider(mid_waveform) * + mid_cdclk_config->vco, size * div); + + /* make sure the mid clock came out sane */ + + drm_WARN_ON(&i915->drm, mid_cdclk_config->cdclk < + min(old_cdclk_config->cdclk, new_cdclk_config->cdclk)); + drm_WARN_ON(&i915->drm, mid_cdclk_config->cdclk > + i915->display.cdclk.max_cdclk_freq); + drm_WARN_ON(&i915->drm, cdclk_squash_waveform(i915, mid_cdclk_config->cdclk) != + mid_waveform); + + return true; +} + +static void _bxt_set_cdclk(struct drm_i915_private *dev_priv, + const struct intel_cdclk_config *cdclk_config, + enum pipe pipe) { int cdclk = cdclk_config->cdclk; int vco = cdclk_config->vco; u32 val; u16 waveform; int clock; - int ret; - - /* Inform power controller of upcoming frequency change. */ - if (DISPLAY_VER(dev_priv) >= 11) - ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, - SKL_CDCLK_PREPARE_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, 3); - else - /* - * BSpec requires us to wait up to 150usec, but that leads to - * timeouts; the 2ms used here is based on experiment. - */ - ret = snb_pcode_write_timeout(&dev_priv->uncore, - HSW_PCODE_DE_WRITE_FREQ_REQ, - 0x80000000, 150, 2); - if (ret) { - drm_err(&dev_priv->drm, - "Failed to inform PCU about cdclk change (err %d, freq %d)\n", - ret, cdclk); - return; - } if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->display.cdclk.hw.vco > 0 && vco > 0) { if (dev_priv->display.cdclk.hw.vco != vco) @@ -1781,6 +1818,44 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv, if (pipe != INVALID_PIPE) intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(dev_priv, pipe)); +} + +static void bxt_set_cdclk(struct drm_i915_private *dev_priv, + const struct intel_cdclk_config *cdclk_config, + enum pipe pipe) +{ + struct intel_cdclk_config mid_cdclk_config; + int cdclk = cdclk_config->cdclk; + int ret; + + /* Inform power controller of upcoming frequency change. */ + if (DISPLAY_VER(dev_priv) >= 11) + ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, + SKL_CDCLK_PREPARE_FOR_CHANGE, + SKL_CDCLK_READY_FOR_CHANGE, + SKL_CDCLK_READY_FOR_CHANGE, 3); + else + /* + * BSpec requires us to wait up to 150usec, but that leads to + * timeouts; the 2ms used here is based on experiment. + */ + ret = snb_pcode_write_timeout(&dev_priv->uncore, + HSW_PCODE_DE_WRITE_FREQ_REQ, + 0x80000000, 150, 2); + if (ret) { + drm_err(&dev_priv->drm, + "Failed to inform PCU about cdclk change (err %d, freq %d)\n", + ret, cdclk); + return; + } + + if (cdclk_crawl_and_squash(dev_priv, &dev_priv->display.cdclk.hw, + cdclk_config, &mid_cdclk_config)) { + _bxt_set_cdclk(dev_priv, &mid_cdclk_config, pipe); + _bxt_set_cdclk(dev_priv, cdclk_config, pipe); + } else { + _bxt_set_cdclk(dev_priv, cdclk_config, pipe); + } if (DISPLAY_VER(dev_priv) >= 11) { ret = snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, @@ -1953,6 +2028,26 @@ void intel_cdclk_uninit_hw(struct drm_i915_private *i915) skl_cdclk_uninit_hw(i915); } +static bool intel_cdclk_can_crawl_and_squash(struct drm_i915_private *i915, + const struct intel_cdclk_config *a, + const struct intel_cdclk_config *b) +{ + u16 old_waveform; + u16 new_waveform; + + if (a->vco == 0 || b->vco == 0) + return false; + + if (!HAS_CDCLK_CRAWL(i915) && !HAS_CDCLK_SQUASH(i915)) + return false; + + old_waveform = cdclk_squash_waveform(i915, a->cdclk); + new_waveform = cdclk_squash_waveform(i915, b->cdclk); + + return a->vco != b->vco && + old_waveform != new_waveform; +} + static bool intel_cdclk_can_crawl(struct drm_i915_private *dev_priv, const struct intel_cdclk_config *a, const struct intel_cdclk_config *b) @@ -2759,9 +2854,14 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state *state) pipe = INVALID_PIPE; } - if (intel_cdclk_can_squash(dev_priv, - &old_cdclk_state->actual, - &new_cdclk_state->actual)) { + if (intel_cdclk_can_crawl_and_squash(dev_priv, + &old_cdclk_state->actual, + &new_cdclk_state->actual)) { + drm_dbg_kms(&dev_priv->drm, + "Can change cdclk via crawling and squashing\n"); + } else if (intel_cdclk_can_squash(dev_priv, + &old_cdclk_state->actual, + &new_cdclk_state->actual)) { drm_dbg_kms(&dev_priv->drm, "Can change cdclk via squashing\n"); } else if (intel_cdclk_can_crawl(dev_priv,