From patchwork Tue Jul 19 19:16:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: cpaul@redhat.com X-Patchwork-Id: 9238173 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A60BB60574 for ; Tue, 19 Jul 2016 19:16:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 92DFD20246 for ; Tue, 19 Jul 2016 19:16:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 876EF26E81; Tue, 19 Jul 2016 19:16:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F242420246 for ; Tue, 19 Jul 2016 19:16:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 981BC6E6F8; Tue, 19 Jul 2016 19:16:19 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id B9AD16E6FC; Tue, 19 Jul 2016 19:16:16 +0000 (UTC) Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1C1B846201; Tue, 19 Jul 2016 19:16:16 +0000 (UTC) Received: from ecstaticemu.bos.redhat.com (dhcp-25-142.bos.redhat.com [10.18.25.142]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u6JJGEho022590; Tue, 19 Jul 2016 15:16:14 -0400 From: Lyude To: Matt Roper , intel-gfx@lists.freedesktop.org Date: Tue, 19 Jul 2016 15:16:07 -0400 Message-Id: <1468955767-5085-1-git-send-email-cpaul@redhat.com> In-Reply-To: <20160719171942.GC21816@intel.com> References: <20160719171942.GC21816@intel.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Tue, 19 Jul 2016 19:16:16 +0000 (UTC) Cc: David Airlie , "open list:INTEL DRM DRIVERS excluding Poulsbo, Moorestow..., linux-kernel@vger.kernel.org open list" , stable@vger.kernel.org, Daniel Vetter Subject: [Intel-gfx] [PATCH v2 1/2] drm/i915/skl: Update plane watermarks atomically during plane updates 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-Virus-Scanned: ClamAV using ClamSMTP Thanks to Ville for suggesting this as a potential solution to pipe underruns on Skylake. On Skylake all of the registers for configuring planes, including the registers for configuring their watermarks, are double buffered. New values written to them won't take effect until said registers are "armed", which is done by writing to the PLANE_SURF (or in the case of cursor planes, the CURBASE register) register. With this in mind, up until now we've been updating watermarks on skl like this: non-modeset { - calculate (during atomic check phase) - finish_atomic_commit: - intel_pre_plane_update: - intel_update_watermarks() - {vblank happens; new watermarks + old plane values => underrun } - drm_atomic_helper_commit_planes_on_crtc: - start vblank evasion - write new plane registers - end vblank evasion } or modeset { - calculate (during atomic check phase) - finish_atomic_commit: - crtc_enable: - intel_update_watermarks() - {vblank happens; new watermarks + old plane values => underrun } - drm_atomic_helper_commit_planes_on_crtc: - start vblank evasion - write new plane registers - end vblank evasion } Now we update watermarks atomically like this: non-modeset { - calculate (during atomic check phase) - finish_atomic_commit: - intel_pre_plane_update: - intel_update_watermarks() (wm values aren't written yet) - drm_atomic_helper_commit_planes_on_crtc: - start vblank evasion - write new plane registers - write new wm values - end vblank evasion } modeset { - calculate (during atomic check phase) - finish_atomic_commit: - crtc_enable: - intel_update_watermarks() (actual wm values aren't written yet) - drm_atomic_helper_commit_planes_on_crtc: - start vblank evasion - write new plane registers - write new wm values - end vblank evasion } Which is more of a step in the right direction to fixing all of the underrun issues we're currently seeing with skl Changes since v1: - Remove mutex_lock/mutex_unlock since they don't do anything and we're not touching global state - Move skl_write_cursor_wm/skl_write_plane_wm functions into intel_pm.c, make externally visible - Add skl_write_plane_wm calls to skl_update_plane - Fix conditional for for loop in skl_write_plane_wm (level < max_level should be level <= max_level) - Make diagram in commit more accurate to what's actually happening Signed-off-by: Lyude Paul Cc: stable@vger.kernel.org Cc: Ville Syrjälä Cc: Daniel Vetter Cc: Radhakrishna Sripada Cc: Hans de Goede Cc: Matt Roper --- drivers/gpu/drm/i915/intel_display.c | 5 ++++ drivers/gpu/drm/i915/intel_drv.h | 2 ++ drivers/gpu/drm/i915/intel_pm.c | 48 +++++++++++++++++++++++++----------- drivers/gpu/drm/i915/intel_sprite.c | 2 ++ 4 files changed, 43 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index fb7d8fc5..1481b2b 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3031,6 +3031,8 @@ static void skylake_update_primary_plane(struct drm_plane *plane, intel_crtc->adjusted_x = x_offset; intel_crtc->adjusted_y = y_offset; + skl_write_plane_wm(intel_crtc, 0); + I915_WRITE(PLANE_CTL(pipe, 0), plane_ctl); I915_WRITE(PLANE_OFFSET(pipe, 0), plane_offset); I915_WRITE(PLANE_SIZE(pipe, 0), plane_size); @@ -10242,6 +10244,9 @@ static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base, int pipe = intel_crtc->pipe; uint32_t cntl = 0; + if (IS_SKYLAKE(dev_priv)) + skl_write_cursor_wm(intel_crtc); + if (plane_state && plane_state->visible) { cntl = MCURSOR_GAMMA_ENABLE; switch (plane_state->base.crtc_w) { diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index e74d851..f1f54d9 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1709,6 +1709,8 @@ void ilk_wm_get_hw_state(struct drm_device *dev); void skl_wm_get_hw_state(struct drm_device *dev); void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv, struct skl_ddb_allocation *ddb /* out */); +void skl_write_cursor_wm(struct intel_crtc *intel_crtc); +void skl_write_plane_wm(struct intel_crtc *intel_crtc, int plane); uint32_t ilk_pipe_pixel_rate(const struct intel_crtc_state *pipe_config); bool ilk_disable_lp_wm(struct drm_device *dev); int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6); diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 213ad35..90c788d 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3776,6 +3776,39 @@ static void skl_ddb_entry_write(struct drm_i915_private *dev_priv, I915_WRITE(reg, 0); } +void skl_write_plane_wm(struct intel_crtc *intel_crtc, + int plane) +{ + struct drm_crtc *crtc = &intel_crtc->base; + struct drm_device *dev = crtc->dev; + struct drm_i915_private *dev_priv = to_i915(dev); + struct skl_wm_values *wm = &dev_priv->wm.skl_results; + int level, max_level = ilk_wm_max_level(dev); + enum pipe pipe = intel_crtc->pipe; + + for (level = 0; level <= max_level; level++) { + I915_WRITE(PLANE_WM(pipe, plane, level), + wm->plane[pipe][plane][level]); + } + I915_WRITE(PLANE_WM_TRANS(pipe, plane), wm->plane_trans[pipe][plane]); +} + +void skl_write_cursor_wm(struct intel_crtc *intel_crtc) +{ + struct drm_crtc *crtc = &intel_crtc->base; + struct drm_device *dev = crtc->dev; + struct drm_i915_private *dev_priv = to_i915(dev); + struct skl_wm_values *wm = &dev_priv->wm.skl_results; + int level, max_level = ilk_wm_max_level(dev); + enum pipe pipe = intel_crtc->pipe; + + for (level = 0; level <= max_level; level++) { + I915_WRITE(CUR_WM(pipe, level), + wm->plane[pipe][PLANE_CURSOR][level]); + } + I915_WRITE(CUR_WM_TRANS(pipe), wm->plane_trans[pipe][PLANE_CURSOR]); +} + static void skl_write_wm_values(struct drm_i915_private *dev_priv, const struct skl_wm_values *new) { @@ -3788,7 +3821,7 @@ static void skl_write_wm_values(struct drm_i915_private *dev_priv, skl_disable_sagv(dev_priv); for_each_intel_crtc(dev, crtc) { - int i, level, max_level = ilk_wm_max_level(dev); + int i; enum pipe pipe = crtc->pipe; if ((new->dirty_pipes & drm_crtc_mask(&crtc->base)) == 0) @@ -3798,19 +3831,6 @@ static void skl_write_wm_values(struct drm_i915_private *dev_priv, I915_WRITE(PIPE_WM_LINETIME(pipe), new->wm_linetime[pipe]); - for (level = 0; level <= max_level; level++) { - for (i = 0; i < intel_num_planes(crtc); i++) - I915_WRITE(PLANE_WM(pipe, i, level), - new->plane[pipe][i][level]); - I915_WRITE(CUR_WM(pipe, level), - new->plane[pipe][PLANE_CURSOR][level]); - } - for (i = 0; i < intel_num_planes(crtc); i++) - I915_WRITE(PLANE_WM_TRANS(pipe, i), - new->plane_trans[pipe][i]); - I915_WRITE(CUR_WM_TRANS(pipe), - new->plane_trans[pipe][PLANE_CURSOR]); - for (i = 0; i < intel_num_planes(crtc); i++) { skl_ddb_entry_write(dev_priv, PLANE_BUF_CFG(pipe, i), diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c index 0de935a..50026f1 100644 --- a/drivers/gpu/drm/i915/intel_sprite.c +++ b/drivers/gpu/drm/i915/intel_sprite.c @@ -238,6 +238,8 @@ skl_update_plane(struct drm_plane *drm_plane, crtc_w--; crtc_h--; + skl_write_plane_wm(to_intel_crtc(crtc_state->base.crtc), plane); + if (key->flags) { I915_WRITE(PLANE_KEYVAL(pipe, plane), key->min_value); I915_WRITE(PLANE_KEYMAX(pipe, plane), key->max_value);