From patchwork Wed Jun 3 12:45:13 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mika Kahola X-Patchwork-Id: 6536901 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4A3D1C0020 for ; Wed, 3 Jun 2015 12:44:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F18BA20615 for ; Wed, 3 Jun 2015 12:44:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id B8C76206BE for ; Wed, 3 Jun 2015 12:44:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 541C972121; Wed, 3 Jun 2015 05:44:32 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTP id 32FB372121 for ; Wed, 3 Jun 2015 05:44:31 -0700 (PDT) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 03 Jun 2015 05:44:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,547,1427785200"; d="scan'208";a="740121246" Received: from sorvi.fi.intel.com ([10.237.72.63]) by orsmga002.jf.intel.com with ESMTP; 03 Jun 2015 05:44:30 -0700 From: Mika Kahola To: intel-gfx@lists.freedesktop.org Date: Wed, 3 Jun 2015 15:45:13 +0300 Message-Id: <1433335514-4156-8-git-send-email-mika.kahola@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433335514-4156-1-git-send-email-mika.kahola@intel.com> References: <1433335514-4156-1-git-send-email-mika.kahola@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v6 7/8] drm/i915: BDW clock change support X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 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" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ville Syrjälä Add support for changing cdclk frequency during runtime on BDW. The procedure is quite a bit different on BDW from the one on HSW, so add a separate function for it. Also with IPS enabled the actual pixel rate mustn't exceed 95% of cdclk, so take that into account when computing the max pixel rate. v2: Grab rps.hw_lock around sandybridge_pcode_write() v3: Rebase due to power well vs. .global_resources() reordering v4: Rebased to the latest v5: Rebased to the latest v6: Patch order shuffle so that Broadwell CD clock change is applied before the patch for Haswell CD clock change v7: Fix for patch style problems Signed-off-by: Ville Syrjälä Signed-off-by: Mika Kahola Author: Ville Syrjälä --- drivers/gpu/drm/i915/i915_reg.h | 2 + drivers/gpu/drm/i915/intel_display.c | 216 +++++++++++++++++++++++++++++++++-- 2 files changed, 208 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 7213224..0f72c0e 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6705,6 +6705,7 @@ enum skl_disp_power_wells { #define GEN6_PCODE_READ_RC6VIDS 0x5 #define GEN6_ENCODE_RC6_VID(mv) (((mv) - 245) / 5) #define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) + 245) +#define BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ 0x18 #define GEN9_PCODE_READ_MEM_LATENCY 0x6 #define GEN9_MEM_LATENCY_LEVEL_MASK 0xFF #define GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT 8 @@ -7170,6 +7171,7 @@ enum skl_disp_power_wells { #define LCPLL_CLK_FREQ_337_5_BDW (2<<26) #define LCPLL_CLK_FREQ_675_BDW (3<<26) #define LCPLL_CD_CLOCK_DISABLE (1<<25) +#define LCPLL_ROOT_CD_CLOCK_DISABLE (1<<24) #define LCPLL_CD2X_CLOCK_DISABLE (1<<23) #define LCPLL_POWER_DOWN_ALLOW (1<<22) #define LCPLL_CD_SOURCE_FCLK (1<<21) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c3f01aa..b1e2069 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5751,7 +5751,22 @@ static void intel_update_max_cdclk(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - if (IS_VALLEYVIEW(dev)) { + if (IS_BROADWELL(dev)) { + /* + * FIXME with extra cooling we can allow + * 540 MHz for ULX and 675 Mhz for ULT. + * How can we know if extra cooling is + * available? PCI ID, VTB, something else? + */ + if (I915_READ(FUSE_STRAP) & HSW_CDCLK_LIMIT) + dev_priv->max_cdclk_freq = 450000; + else if (IS_BDW_ULX(dev)) + dev_priv->max_cdclk_freq = 450000; + else if (IS_BDW_ULT(dev)) + dev_priv->max_cdclk_freq = 540000; + else + dev_priv->max_cdclk_freq = 675000; + } else if (IS_VALLEYVIEW(dev)) { dev_priv->max_cdclk_freq = 400000; } else { /* otherwise assume cdclk is fixed */ @@ -6621,13 +6636,11 @@ static bool pipe_config_supports_ips(struct drm_i915_private *dev_priv, return true; /* - * FIXME if we compare against max we should then - * increase the cdclk frequency when the current - * value is too low. The other option is to compare - * against the cdclk frequency we're going have post - * modeset (ie. one we computed using other constraints). - * Need to measure whether using a lower cdclk w/o IPS - * is better or worse than a higher cdclk w/ IPS. + * We compare against max which means we must take + * the increased cdclk requirement into account when + * calculating the new cdclk. + * + * Should measure whether using a lower cdclk w/o IPS */ return ilk_pipe_pixel_rate(pipe_config) <= dev_priv->max_cdclk_freq * 95 / 100; @@ -9608,6 +9621,182 @@ static void broxton_modeset_global_resources(struct drm_atomic_state *old_state) broxton_set_cdclk(dev, req_cdclk); } +/* compute the max rate for new configuration */ +static int ilk_max_pixel_rate(struct drm_i915_private *dev_priv) +{ + struct drm_device *dev = dev_priv->dev; + struct intel_crtc *intel_crtc; + struct drm_crtc *crtc; + int max_pixel_rate = 0; + int pixel_rate; + + for_each_crtc(dev, crtc) { + if (!crtc->state->enable) + continue; + + intel_crtc = to_intel_crtc(crtc); + pixel_rate = ilk_pipe_pixel_rate(intel_crtc->config); + + /* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */ + if (IS_BROADWELL(dev) && intel_crtc->config->ips_enabled) + pixel_rate = DIV_ROUND_UP(pixel_rate * 100, 95); + + max_pixel_rate = max(max_pixel_rate, pixel_rate); + } + + return max_pixel_rate; +} + +static void broadwell_set_cdclk(struct drm_device *dev, int cdclk) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t val, data; + int ret; + + if (WARN((I915_READ(LCPLL_CTL) & + (LCPLL_PLL_DISABLE | LCPLL_PLL_LOCK | + LCPLL_CD_CLOCK_DISABLE | LCPLL_ROOT_CD_CLOCK_DISABLE | + LCPLL_CD2X_CLOCK_DISABLE | LCPLL_POWER_DOWN_ALLOW | + LCPLL_CD_SOURCE_FCLK)) != LCPLL_PLL_LOCK, + "trying to change cdclk frequency with cdclk not enabled\n")) + return; + + mutex_lock(&dev_priv->rps.hw_lock); + ret = sandybridge_pcode_write(dev_priv, + BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0); + mutex_unlock(&dev_priv->rps.hw_lock); + if (ret) { + DRM_ERROR("failed to inform pcode about cdclk change\n"); + return; + } + + val = I915_READ(LCPLL_CTL); + val |= LCPLL_CD_SOURCE_FCLK; + I915_WRITE(LCPLL_CTL, val); + + if (wait_for_atomic_us(I915_READ(LCPLL_CTL) & + LCPLL_CD_SOURCE_FCLK_DONE, 1)) + DRM_ERROR("Switching to FCLK failed\n"); + + val = I915_READ(LCPLL_CTL); + val &= ~LCPLL_CLK_FREQ_MASK; + + switch (cdclk) { + case 450000: + val |= LCPLL_CLK_FREQ_450; + data = 0; + break; + case 540000: + val |= LCPLL_CLK_FREQ_54O_BDW; + data = 1; + break; + case 337500: + val |= LCPLL_CLK_FREQ_337_5_BDW; + data = 2; + break; + case 675000: + val |= LCPLL_CLK_FREQ_675_BDW; + data = 3; + break; + default: + WARN(1, "invalid cdclk frequency\n"); + return; + } + + I915_WRITE(LCPLL_CTL, val); + + val = I915_READ(LCPLL_CTL); + val &= ~LCPLL_CD_SOURCE_FCLK; + I915_WRITE(LCPLL_CTL, val); + + if (wait_for_atomic_us((I915_READ(LCPLL_CTL) & + LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1)) + DRM_ERROR("Switching back to LCPLL failed\n"); + + mutex_lock(&dev_priv->rps.hw_lock); + sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ, data); + mutex_unlock(&dev_priv->rps.hw_lock); + + intel_update_cdclk(dev); + + WARN(cdclk != dev_priv->cdclk_freq, + "cdclk requested %d kHz but got %d kHz\n", + cdclk, dev_priv->cdclk_freq); +} + +static int broadwell_calc_cdclk(struct drm_i915_private *dev_priv, + int max_pixel_rate) +{ + int cdclk; + + /* + * FIXME should also account for plane ratio + * once 64bpp pixel formats are supported. + */ + if (max_pixel_rate > 540000) + cdclk = 675000; + else if (max_pixel_rate > 450000) + cdclk = 540000; + else if (max_pixel_rate > 337500) + cdclk = 450000; + else + cdclk = 337500; + + /* + * FIXME move the cdclk caclulation to + * compute_config() so we can fail gracegully. + */ + if (cdclk > dev_priv->max_cdclk_freq) { + DRM_ERROR("requested cdclk (%d kHz) exceeds max (%d kHz)\n", + cdclk, dev_priv->max_cdclk_freq); + cdclk = dev_priv->max_cdclk_freq; + } + + return cdclk; +} + +static int broadwell_modeset_global_pipes(struct drm_atomic_state *state) +{ + struct drm_i915_private *dev_priv = to_i915(state->dev); + struct drm_crtc *crtc; + struct drm_crtc_state *crtc_state; + int max_pixclk = ilk_max_pixel_rate(dev_priv); + int cdclk, i; + + cdclk = broadwell_calc_cdclk(dev_priv, max_pixclk); + + if (cdclk == dev_priv->cdclk_freq) + return 0; + + /* add all active pipes to the state */ + for_each_crtc(state->dev, crtc) { + if (!crtc->state->enable) + continue; + + crtc_state = drm_atomic_get_crtc_state(state, crtc); + if (IS_ERR(crtc_state)) + return PTR_ERR(crtc_state); + } + + /* disable/enable all currently active pipes while we change cdclk */ + for_each_crtc_in_state(state, crtc, crtc_state, i) + if (crtc_state->enable) + crtc_state->mode_changed = true; + + return 0; +} + +static void broadwell_modeset_global_resources(struct drm_atomic_state *state) +{ + struct drm_device *dev = state->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + int max_pixel_rate = ilk_max_pixel_rate(dev_priv); + int req_cdclk = broadwell_calc_cdclk(dev_priv, max_pixel_rate); + + if (req_cdclk != dev_priv->cdclk_freq) + broadwell_set_cdclk(dev, req_cdclk); +} + static int haswell_crtc_compute_clock(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state) { @@ -12788,8 +12977,12 @@ static int __intel_set_mode_checks(struct drm_atomic_state *state) * mode set on this crtc. For other crtcs we need to use the * adjusted_mode bits in the crtc directly. */ - if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev)) { - ret = valleyview_modeset_global_pipes(state); + if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev) || IS_BROADWELL(dev)) { + if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev)) + ret = valleyview_modeset_global_pipes(state); + else + ret = broadwell_modeset_global_pipes(state); + if (ret) return ret; } @@ -14677,6 +14870,9 @@ static void intel_init_display(struct drm_device *dev) dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train; } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { dev_priv->display.fdi_link_train = hsw_fdi_link_train; + if (IS_BROADWELL(dev)) + dev_priv->display.modeset_global_resources = + broadwell_modeset_global_resources; } else if (IS_VALLEYVIEW(dev)) { dev_priv->display.modeset_global_resources = valleyview_modeset_global_resources;