From patchwork Tue Feb 15 23:54:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 543338 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B076C433F5 for ; Tue, 15 Feb 2022 23:54:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244896AbiBOXzG (ORCPT ); Tue, 15 Feb 2022 18:55:06 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:59340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237886AbiBOXzE (ORCPT ); Tue, 15 Feb 2022 18:55:04 -0500 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A868EF65FE for ; Tue, 15 Feb 2022 15:54:53 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id l73so562002pge.11 for ; Tue, 15 Feb 2022 15:54:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=OTjPJEv3ppz+4wwYIsjeEfkrs5jHH+xc9iC4EpIvllM=; b=bX3WqJk+exjCq2P0E71uHI+d1H1gMFVhRanSZrq0RtyTM6ZnoNrpgaDZmfh8JQIb3P 9lp7dBU45gQfukf/Ecau1JNWXrD6fV/DwJL6kzQ6tqPKRPjQ0vg2uzA8LmE/DFcotBI8 Mb3q+EwmEEHoIF4mG07cGcDG8P8BPqZR0KveU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=OTjPJEv3ppz+4wwYIsjeEfkrs5jHH+xc9iC4EpIvllM=; b=IXNOG4wFogvUao/GeYM0cb7EbXT7vKh4NSHzWU+y00u5ZKPufw3UUCAvFZR3E86q6g qK9it5/7cVuADz8zoX+0nH2tZu9PA9bMHspM5gAKHqVn/Oy2EUziR8aGsSgdyaGuB5fp VjdJJUNGfeofhtXaND6EJNASl7a7S8A8uTp5X7aB5lQp7zwNM62wawUC9G/29hfpeYXF sgLdxgCSVKtEsV6mab7cvaqztGgxTvo1txbnSqbAZxxZ4bxt0Rc5/sRC6We5CUmnAjXf O/p4ZGgQRCzIUVkHzVOgQ8a3Z9YfGzMxV+qSYrautSTyAnz6n1xcOOLZCana8aHf6EkV hl4w== X-Gm-Message-State: AOAM533rUvqsRr5p307BSrwNp4EGQBpnRF/1fXosbGjIV+SQZFQD+xzd +wxKQ0IFe3/zSLWV3EvLm6wQ6A== X-Google-Smtp-Source: ABdhPJyJigo6j1/TFkCRK+3+g9/LHae8UwKZbETfFM8qk5v8BSLotLEGqFJiM6DKZdJXWUXfP0QCWA== X-Received: by 2002:a62:5347:0:b0:4e0:2ea8:9f6c with SMTP id h68-20020a625347000000b004e02ea89f6cmr396742pfb.61.1644969293185; Tue, 15 Feb 2022 15:54:53 -0800 (PST) Received: from localhost ([2620:15c:202:201:97ca:4b5:7d22:b276]) by smtp.gmail.com with UTF8SMTPSA id gb8sm3325304pjb.21.2022.02.15.15.54.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Feb 2022 15:54:52 -0800 (PST) From: Brian Norris To: Andrzej Hajda , Neil Armstrong , Robert Foss , David Airlie , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Cc: Heiko Stuebner , Jernej Skrabec , dri-devel@lists.freedesktop.org, Laurent Pinchart , Jonas Karlman , Sean Paul , linux-kernel@vger.kernel.org, Sean Paul , Brian Norris , stable@vger.kernel.org Subject: [PATCH 1/2] drm/bridge: analogix_dp: Support PSR-exit to disable transition Date: Tue, 15 Feb 2022 15:54:19 -0800 Message-Id: <20220215155417.1.I161904be17ba14526f78536ccd78b85818449b51@changeid> X-Mailer: git-send-email 2.35.1.265.g69c8d7142f-goog In-Reply-To: <20220215235420.1284208-1-briannorris@chromium.org> References: <20220215235420.1284208-1-briannorris@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Most eDP panel functions only work correctly when the panel is not in self-refresh. In particular, analogix_dp_bridge_disable() tends to hit AUX channel errors if the panel is in self-refresh. Given the above, it appears that so far, this driver assumes that we are never in self-refresh when it comes time to fully disable the bridge. Prior to commit 846c7dfc1193 ("drm/atomic: Try to preserve the crtc enabled state in drm_atomic_remove_fb, v2."), this tended to be true, because we would automatically disable the pipe when framebuffers were removed, and so we'd typically disable the bridge shortly after the last display activity. However, that is not guaranteed: an idle (self-refresh) display pipe may be disabled, e.g., when switching CRTCs. We need to exit PSR first. Stable notes: this is definitely a bugfix, and the bug has likely existed in some form for quite a while. It may predate the "PSR helpers" refactor, but the code looked very different before that, and it's probably not worth rewriting the fix. Cc: Fixes: 6c836d965bad ("drm/rockchip: Use the helpers for PSR") Signed-off-by: Brian Norris --- .../drm/bridge/analogix/analogix_dp_core.c | 42 +++++++++++++++++-- 1 file changed, 38 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index b7d2e4449cfa..6ee0f62a7161 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1268,6 +1268,25 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge, return 0; } +static +struct drm_crtc *analogix_dp_get_old_crtc(struct analogix_dp_device *dp, + struct drm_atomic_state *state) +{ + struct drm_encoder *encoder = dp->encoder; + struct drm_connector *connector; + struct drm_connector_state *conn_state; + + connector = drm_atomic_get_old_connector_for_encoder(state, encoder); + if (!connector) + return NULL; + + conn_state = drm_atomic_get_old_connector_state(state, connector); + if (!conn_state) + return NULL; + + return conn_state->crtc; +} + static struct drm_crtc *analogix_dp_get_new_crtc(struct analogix_dp_device *dp, struct drm_atomic_state *state) @@ -1448,14 +1467,16 @@ analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge, { struct drm_atomic_state *old_state = old_bridge_state->base.state; struct analogix_dp_device *dp = bridge->driver_private; - struct drm_crtc *crtc; + struct drm_crtc *old_crtc, *new_crtc; + struct drm_crtc_state *old_crtc_state = NULL; struct drm_crtc_state *new_crtc_state = NULL; + int ret; - crtc = analogix_dp_get_new_crtc(dp, old_state); - if (!crtc) + new_crtc = analogix_dp_get_new_crtc(dp, old_state); + if (!new_crtc) goto out; - new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc); + new_crtc_state = drm_atomic_get_new_crtc_state(old_state, new_crtc); if (!new_crtc_state) goto out; @@ -1464,6 +1485,19 @@ analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge, return; out: + old_crtc = analogix_dp_get_old_crtc(dp, old_state); + if (old_crtc) { + old_crtc_state = drm_atomic_get_old_crtc_state(old_state, + old_crtc); + + /* When moving from PSR to fully disabled, exit PSR first. */ + if (old_crtc_state && old_crtc_state->self_refresh_active) { + ret = analogix_dp_disable_psr(dp); + if (ret) + DRM_ERROR("Failed to disable psr (%d)\n", ret); + } + } + analogix_dp_bridge_disable(bridge); }