From patchwork Fri Jul 22 12:21:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liviu Dudau X-Patchwork-Id: 12926431 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 45DB9C43334 for ; Fri, 22 Jul 2022 12:21:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 53DC414B9BC; Fri, 22 Jul 2022 12:21:50 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by gabe.freedesktop.org (Postfix) with ESMTP id 2930A14B0F2 for ; Fri, 22 Jul 2022 12:21:49 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1F80A1063; Fri, 22 Jul 2022 05:21:49 -0700 (PDT) Received: from e110455-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 0777D3F70D; Fri, 22 Jul 2022 05:21:47 -0700 (PDT) From: Liviu Dudau To: Carsten Haitzler Subject: [PATCH] drm/komeda: Fix handling of atomic commits in the atomic_commit_tail hook Date: Fri, 22 Jul 2022 13:21:39 +0100 Message-Id: <20220722122139.288486-1-liviu.dudau@arm.com> X-Mailer: git-send-email 2.37.1 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: , Cc: DRI devel , Steven Price Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Komeda driver relies on the generic DRM atomic helper functions to handle commits. It only implements an atomic_commit_tail hook for the mode_config_helper_funcs and even that one is pretty close to the generic implementation with the exception of additional dma_fence signalling. What the generic helper framework doesn't do is waiting for the actual hardware to signal that the commit parameters have been written into the appropriate registers. As we signal CRTC events only on the irq handlers, we need to flush the configuration and wait for the hardware to respond. Add the Komeda specific implementation for atomic_commit_hw_done() that flushes and waits for flip done before calling drm_atomic_helper_commit_hw_done(). The fix was prompted by a patch from Carsten Haitzler where he was trying to solve the same issue but in a different way that I think can lead to wrong event signaling to userspace. Reported-by: Carsten Haitzler Tested-by: Carsten Haitzler Signed-off-by: Liviu Dudau --- .../gpu/drm/arm/display/komeda/komeda_crtc.c | 4 ++-- .../gpu/drm/arm/display/komeda/komeda_kms.c | 21 ++++++++++++++++++- .../gpu/drm/arm/display/komeda/komeda_kms.h | 2 ++ 3 files changed, 24 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c index 59172acb9738..292f533d8cf0 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c @@ -235,7 +235,7 @@ void komeda_crtc_handle_event(struct komeda_crtc *kcrtc, crtc->state->event = NULL; drm_crtc_send_vblank_event(crtc, event); } else { - DRM_WARN("CRTC[%d]: FLIP happen but no pending commit.\n", + DRM_WARN("CRTC[%d]: FLIP happened but no pending commit.\n", drm_crtc_index(&kcrtc->base)); } spin_unlock_irqrestore(&crtc->dev->event_lock, flags); @@ -286,7 +286,7 @@ komeda_crtc_atomic_enable(struct drm_crtc *crtc, komeda_crtc_do_flush(crtc, old); } -static void +void komeda_crtc_flush_and_wait_for_flip_done(struct komeda_crtc *kcrtc, struct completion *input_flip_done) { diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c index 93b7f09b96ca..327051bba5b6 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c @@ -69,6 +69,25 @@ static const struct drm_driver komeda_kms_driver = { .minor = 1, }; +static void komeda_kms_atomic_commit_hw_done(struct drm_atomic_state *state) +{ + struct drm_device *dev = state->dev; + struct komeda_kms_dev *kms = to_kdev(dev); + int i; + + for (i = 0; i < kms->n_crtcs; i++) { + struct komeda_crtc *kcrtc = &kms->crtcs[i]; + + if (kcrtc->base.state->active) { + struct completion *flip_done = NULL; + if (kcrtc->base.state->event) + flip_done = kcrtc->base.state->event->base.completion; + komeda_crtc_flush_and_wait_for_flip_done(kcrtc, flip_done); + } + } + drm_atomic_helper_commit_hw_done(state); +} + static void komeda_kms_commit_tail(struct drm_atomic_state *old_state) { struct drm_device *dev = old_state->dev; @@ -81,7 +100,7 @@ static void komeda_kms_commit_tail(struct drm_atomic_state *old_state) drm_atomic_helper_commit_modeset_enables(dev, old_state); - drm_atomic_helper_commit_hw_done(old_state); + komeda_kms_atomic_commit_hw_done(old_state); drm_atomic_helper_wait_for_flip_done(dev, old_state); diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h index 7889e380ab23..7339339ef6b8 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h @@ -183,6 +183,8 @@ void komeda_kms_cleanup_private_objs(struct komeda_kms_dev *kms); void komeda_crtc_handle_event(struct komeda_crtc *kcrtc, struct komeda_events *evts); +void komeda_crtc_flush_and_wait_for_flip_done(struct komeda_crtc *kcrtc, + struct completion *input_flip_done); struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev); void komeda_kms_detach(struct komeda_kms_dev *kms);