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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 E0D63C88E77 for ; Wed, 16 Sep 2026 06:24:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=+wG3urIqyzvutvhz3o+cV/d3V7dF1C3I+4csedxlzqA=; b=29Say84eTVfXCyKnUx3e2F8yaF +SwnfCB+iC7VGBKItzwglnAHYMxWHLmsEAOf6twYF0oiivjLi3ln2F2e7kfokzwN9A+gd4Lvj33T7 +WNCsQUbZ2QUfcF9VD2uRAGrwn+ppXaJxq/ct3wlxKx5htJDNDgWW0nJ6npE2c3kCbgB9eFuoddiR Uut/MFQw2B7iBJGKOG430YeVy8yr52FqMBj/JyWPDCN7DtV+DqBDpa0N4hRhI5HegeYIGO1LkWXAO eUr6YpbN6yLxlK6e5c5XgWNpyipdG2cu5tiUOTjMY7s/49iH13dEQMwyF2xDrNtW4URL6/nYt+JlR F48jzyEg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6j49-00000008TN5-0ueB; Wed, 16 Sep 2026 06:24:21 +0000 Received: from smtp-out2.suse.de ([2a07:de40:b251:101:10:150:64:2]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6j46-00000008TMO-1B0a for linux-arm-kernel@lists.infradead.org; Wed, 16 Sep 2026 06:24:19 +0000 Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 9A7501FE21; Wed, 16 Sep 2026 06:24:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1789539850; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=+wG3urIqyzvutvhz3o+cV/d3V7dF1C3I+4csedxlzqA=; b=FIez1earGLDGi7AqR01AuARvOdlajBp+fRMJJGGeMnoTq9dvnv8hE+2+gQMjWWcpKgyOLE Rku1ObTlPRpO9d3QhfYq3w5xFrQ9UJdihQAgaVmQguhkUR0wsXjPhFE/I81McJ8toPFvxd LloqQsKoLaB0OKmvT0WyzdFoTqBbWds= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1789539850; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=+wG3urIqyzvutvhz3o+cV/d3V7dF1C3I+4csedxlzqA=; b=RjL6l8c7EsdgERq9co40eQ+Wc02hB5lJOzclY2Lh8ZiNcUBip/Y5z1vXt3Nx/OeT79fF/y O2vIt8n7NWHc+ZDQ== Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=HV1v3uyF; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=7fiYrcF9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1789539846; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=+wG3urIqyzvutvhz3o+cV/d3V7dF1C3I+4csedxlzqA=; b=HV1v3uyFjN5zL4NWzhwKMUjp7TwlFd4m1QaG4vFm2grNfzrds33nWaEFJlTtQTTAl4D4GA +/JjHPWs1MSVm5S4zSpKQSInBbt/Urj+jlb/fyMVXUDCkKku6Eqp/5k7pUSYXFx+YtZ/Yv rpL8xVbpMnduyVg/dTUJUMNUFECyXN8= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1789539846; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=+wG3urIqyzvutvhz3o+cV/d3V7dF1C3I+4csedxlzqA=; b=7fiYrcF9r6CsxpTC7KA1gcliQjuqfJKzfk9I74tLP5t4YESS86eerA8R6qzTH0zULKC6v3 HchgkWW6EGZZFyBQ== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id CC8D9136D1; Wed, 16 Sep 2026 06:24:05 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id nLZ5HgU2qmrNRQAAD6G6ig (envelope-from ); Wed, 16 Sep 2026 06:24:05 +0000 Message-ID: Date: Wed, 16 Sep 2026 08:24:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/2] drm/imx/lcdc: avoid duplicate clk_per enable To: Ze Huang , Alexey Brodkin , Maarten Lankhorst , Maxime Ripard , David Airlie , Simona Vetter , Joel Stanley , Andrew Jeffery , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Linus Walleij , Hans de Goede , Alex Lanzano , Oleksandr Andrushchenko , Philipp Zabel , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , Marian Cichy Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, xen-devel@lists.xenproject.org References: <20260727-drm-simple-kms-removal-v3-0-de36e534f7a1@oss.qualcomm.com> <20260727-drm-simple-kms-removal-v3-1-de36e534f7a1@oss.qualcomm.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <20260727-drm-simple-kms-removal-v3-1-de36e534f7a1@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 9A7501FE21 X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_TO(0.00)[oss.qualcomm.com,synopsys.com,linux.intel.com,kernel.org,gmail.com,ffwll.ch,jms.id.au,codeconstruct.com.au,nxp.com,pengutronix.de,epam.com]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_TWELVE(0.00)[25]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_RCPT(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,suse.de:dkim,suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,qualcomm.com:email] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260915_232418_631738_C3C8895D X-CRM114-Status: GOOD ( 20.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Am 26.07.26 um 21:42 schrieb Ze Huang: > The simple-KMS helper calls the pipe update after enabling the CRTC. > On an enable commit, imx_lcdc_pipe_enable() already programs the > mode and enables clk_per. The following pipe update sees the plane move > from no CRTC to the active CRTC, treats it as a mode update, and calls > imx_lcdc_update_hw_registers() again. > > That second call has no old CRTC state to disable clk_per first, but it > enables clk_per again at the end. The disable path only drops one > reference, leaving clk_per enabled after each on/off cycle. > > Skip the register update from the pipe update path when the CRTC already > needs a modeset. The enable path has already programmed the hardware for > that commit; keep the event handling in pipe update unchanged. That seems reasonable. Once the driver uses regular DRM helpers instead of simple_kms, it can all be untangled and this test won't be necessary any longer. > > Fixes: c87e859cdeb5 ("drm/imx/lcdc: Implement DRM driver for imx25") > Signed-off-by: Ze Huang Acked-by: Thomas Zimmermann > --- > drivers/gpu/drm/imx/lcdc/imx-lcdc.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/imx/lcdc/imx-lcdc.c b/drivers/gpu/drm/imx/lcdc/imx-lcdc.c > index f52832b43aca..81024f7d9e96 100644 > --- a/drivers/gpu/drm/imx/lcdc/imx-lcdc.c > +++ b/drivers/gpu/drm/imx/lcdc/imx-lcdc.c > @@ -311,7 +311,8 @@ static void imx_lcdc_pipe_update(struct drm_simple_display_pipe *pipe, > else if (old_crtc != crtc) > mode_changed = true; > > - imx_lcdc_update_hw_registers(pipe, old_state, mode_changed); > + if (!drm_atomic_crtc_needs_modeset(crtc->state)) > + imx_lcdc_update_hw_registers(pipe, old_state, mode_changed); > > if (event) { > crtc->state->event = NULL; > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)