From mboxrd@z Thu Jan 1 00:00:00 1970 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 22F1EEB64DB for ; Mon, 19 Jun 2023 10:55:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232321AbjFSKzY (ORCPT ); Mon, 19 Jun 2023 06:55:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232391AbjFSKy4 (ORCPT ); Mon, 19 Jun 2023 06:54:56 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 418FF10F9 for ; Mon, 19 Jun 2023 03:53:22 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9CB1760B5E for ; Mon, 19 Jun 2023 10:53:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0CE8C433C8; Mon, 19 Jun 2023 10:53:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1687172001; bh=VyZ1xoQ/c/qTma/aijGGuo2oo/G61WqJ2O9mKfy+TJk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P6Rl4dsI55Ul4UEyi4B7ngDuzxWER9LNVF8/mNgmwhrh1Y9ZPY0Eb4e740S6bmPLW NZPohgTN0IDW9rMaQM5XiJYg8BiueM6SuO1eb+CvFBcuI6Hup3itcsT7d8qhBhXS8H t1i3anx0qhmr8KoD/XqKINrGQEF1dx8sI/Y97fGM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Lyude Paul , Ben Skeggs , Sasha Levin Subject: [PATCH 5.4 53/64] drm/nouveau/kms: Dont change EDID when it hasnt actually changed Date: Mon, 19 Jun 2023 12:30:49 +0200 Message-ID: <20230619102135.606323120@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230619102132.808972458@linuxfoundation.org> References: <20230619102132.808972458@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lyude Paul [ Upstream commit f28e32d3906eac2e1cb3291b448f0d528ec93996 ] Currently in nouveau_connector_ddc_detect() and nouveau_connector_detect_lvds(), we start the connector probing process by releasing the previous EDID and informing DRM of the change. However, since commit 5186421cbfe2 ("drm: Introduce epoch counter to drm_connector") drm_connector_update_edid_property() actually checks whether the new EDID we've specified is different from the previous one, and updates the connector's epoch accordingly if it is. But, because we always set the EDID to NULL first in nouveau_connector_ddc_detect() and nouveau_connector_detect_lvds() we end up making DRM think that the EDID changes every single time we do a connector probe - which isn't needed. So, let's fix this by not clearing the EDID at the start of the connector probing process, and instead simply changing or removing it once near the end of the probing process. This will help prevent us from sending unneeded hotplug events to userspace when nothing has actually changed. Signed-off-by: Lyude Paul Reviewed-by: Ben Skeggs Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-19-lyude@redhat.com Stable-dep-of: 55b94bb8c424 ("drm/nouveau: add nv_encoder pointer check for NULL") Signed-off-by: Sasha Levin --- drivers/gpu/drm/nouveau/nouveau_connector.c | 54 ++++++++++----------- 1 file changed, 27 insertions(+), 27 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index 18c3aae91be26..048a04701910e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -538,6 +538,17 @@ nouveau_connector_set_encoder(struct drm_connector *connector, } } +static void +nouveau_connector_set_edid(struct nouveau_connector *nv_connector, + struct edid *edid) +{ + struct edid *old_edid = nv_connector->edid; + + drm_connector_update_edid_property(&nv_connector->base, edid); + kfree(old_edid); + nv_connector->edid = edid; +} + static enum drm_connector_status nouveau_connector_detect(struct drm_connector *connector, bool force) { @@ -551,13 +562,6 @@ nouveau_connector_detect(struct drm_connector *connector, bool force) int ret; enum drm_connector_status conn_status = connector_status_disconnected; - /* Cleanup the previous EDID block. */ - if (nv_connector->edid) { - drm_connector_update_edid_property(connector, NULL); - kfree(nv_connector->edid); - nv_connector->edid = NULL; - } - /* Outputs are only polled while runtime active, so resuming the * device here is unnecessary (and would deadlock upon runtime suspend * because it waits for polling to finish). We do however, want to @@ -570,22 +574,23 @@ nouveau_connector_detect(struct drm_connector *connector, bool force) ret = pm_runtime_get_sync(dev->dev); if (ret < 0 && ret != -EACCES) { pm_runtime_put_autosuspend(dev->dev); + nouveau_connector_set_edid(nv_connector, NULL); return conn_status; } } nv_encoder = nouveau_connector_ddc_detect(connector); if (nv_encoder && (i2c = nv_encoder->i2c) != NULL) { + struct edid *new_edid; + if ((vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC) && nv_connector->type == DCB_CONNECTOR_LVDS) - nv_connector->edid = drm_get_edid_switcheroo(connector, - i2c); + new_edid = drm_get_edid_switcheroo(connector, i2c); else - nv_connector->edid = drm_get_edid(connector, i2c); + new_edid = drm_get_edid(connector, i2c); - drm_connector_update_edid_property(connector, - nv_connector->edid); + nouveau_connector_set_edid(nv_connector, new_edid); if (!nv_connector->edid) { NV_ERROR(drm, "DDC responded, but no EDID for %s\n", connector->name); @@ -619,6 +624,8 @@ nouveau_connector_detect(struct drm_connector *connector, bool force) conn_status = connector_status_connected; drm_dp_cec_set_edid(&nv_connector->aux, nv_connector->edid); goto out; + } else { + nouveau_connector_set_edid(nv_connector, NULL); } nv_encoder = nouveau_connector_of_detect(connector); @@ -661,18 +668,12 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force) struct nouveau_drm *drm = nouveau_drm(dev); struct nouveau_connector *nv_connector = nouveau_connector(connector); struct nouveau_encoder *nv_encoder = NULL; + struct edid *edid = NULL; enum drm_connector_status status = connector_status_disconnected; - /* Cleanup the previous EDID block. */ - if (nv_connector->edid) { - drm_connector_update_edid_property(connector, NULL); - kfree(nv_connector->edid); - nv_connector->edid = NULL; - } - nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); if (!nv_encoder) - return connector_status_disconnected; + goto out; /* Try retrieving EDID via DDC */ if (!drm->vbios.fp_no_ddc) { @@ -691,7 +692,8 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force) * valid - it's not (rh#613284) */ if (nv_encoder->dcb->lvdsconf.use_acpi_for_edid) { - if ((nv_connector->edid = nouveau_acpi_edid(dev, connector))) { + edid = nouveau_acpi_edid(dev, connector); + if (edid) { status = connector_status_connected; goto out; } @@ -711,12 +713,10 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force) * stored for the panel stored in them. */ if (!drm->vbios.fp_no_ddc) { - struct edid *edid = - (struct edid *)nouveau_bios_embedded_edid(dev); + edid = (struct edid *)nouveau_bios_embedded_edid(dev); if (edid) { - nv_connector->edid = - kmemdup(edid, EDID_LENGTH, GFP_KERNEL); - if (nv_connector->edid) + edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL); + if (edid) status = connector_status_connected; } } @@ -729,7 +729,7 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force) status = connector_status_unknown; #endif - drm_connector_update_edid_property(connector, nv_connector->edid); + nouveau_connector_set_edid(nv_connector, edid); nouveau_connector_set_encoder(connector, nv_encoder); return status; } -- 2.39.2