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 B4964C48286 for ; Sun, 4 Feb 2024 15:55:31 +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=Pw/KaLqyNXN7B46B9Layw79P/0my6PltB7XkP8ad8AY=; b=nDpiNIWVr00OCWxXuYzZXmTrxO j2sXcRoEIHiSWkrcM03ppP6SenKK2SR083jcFyWzS6qqBL1a8iidE/2amwXIu/mN/y9+irWyfU4qq IqmuIRizhTOfALCRrywH49iK6owaH8VgTTEypzXdldaRZgCC6GoJbsw5+c2JvCGvCMgm8irf0JYY3 Vdh4vwf9377gUOQup2P9Uoe9NjuEf8PNfvgOORJJrzupaohILT6AAKKE+wnYjrMr6RDa3hj2QifxL VGIUVdSvUB8vgVWQAyIQvF9kVyM0WrZxJ6KA/ZN4BXk1IwopUo8WZUIrvXjzVtVmeR5LZ+cHf3nRd jGsu5k6g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWeq8-000000015QZ-3scg; Sun, 04 Feb 2024 15:55:28 +0000 Received: from relay6-d.mail.gandi.net ([217.70.183.198]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWeq5-000000015Py-0Hx3; Sun, 04 Feb 2024 15:55:27 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 5F69AC0004; Sun, 4 Feb 2024 15:55:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arinc9.com; s=gm1; t=1707062121; h=from:from:reply-to:subject:subject: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; bh=Pw/KaLqyNXN7B46B9Layw79P/0my6PltB7XkP8ad8AY=; b=Zsi3a1I4x8UIMP+yLCiVz83TQxWgGQm/ZMkkbXAmXyuZsBORrwDbyXEtbnKt42BFJkIJH0 4fa1GLCiscX/G+oULpJt7cAQ70E6BPyYd8i01Pe5HU21TqbNFVJXrclrVXP0VF2KCwk13g M0pPbT0EXdA7jk6N6hAkchT4bEiuq/jkwdkPH+GckWWa5hmoNjiRuovm9yHSauWw2QMFUp +LwpBjD1VK2HOFaramUEHxD5FaRool2EE1geTIx0l9X8w0BquumaKGjy95aVe7I816n6NR lCahbfbhKBWyzGii0KaXl4eKkTNSNlnSv3x1TaFkcBIljC+7a/opKSMIyyWZDw== Message-ID: <4fa2ff0d-2804-4a58-980f-162e62b3dc9c@arinc9.com> Date: Sun, 4 Feb 2024 18:55:14 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v3 4/7] net: dsa: mt7530: move XTAL check to mt7530_setup() Content-Language: en-US To: "Russell King (Oracle)" Cc: Daniel Golle , DENG Qingfang , Sean Wang , Andrew Lunn , Florian Fainelli , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Matthias Brugger , AngeloGioacchino Del Regno , mithat.guner@xeront.com, erkin.bozoglu@xeront.com, Bartel Eerdekens , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org References: <20240202-for-netnext-mt7530-improvements-2-v3-0-63d5adae99ca@arinc9.com> <20240202-for-netnext-mt7530-improvements-2-v3-4-63d5adae99ca@arinc9.com> <5b744f7f-2f63-4219-a0e9-8f08267b1fdd@arinc9.com> From: =?UTF-8?B?QXLEsW7DpyDDnE5BTA==?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-Sasl: arinc.unal@arinc9.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240204_075525_400224_EB94118E X-CRM114-Status: GOOD ( 28.38 ) X-BeenThere: linux-mediatek@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-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 4.02.2024 17:18, Russell King (Oracle) wrote: > On Sun, Feb 04, 2024 at 04:55:40PM +0300, Arınç ÜNAL wrote: >> This is not about laziness. This is before patch 2: >> >> phylink_mac_ops :: mac_config() -> dsa_port_phylink_mac_config() >> -> dsa_switch_ops :: phylink_mac_config() -> mt753x_phylink_mac_config() >> -> mt753x_mac_config() >> -> mt753x_info :: mac_port_config() -> mt7530_mac_config() >> -> mt7530_setup_port5() >> -> mt753x_pad_setup() >> -> mt753x_info :: pad_setup() -> mt7530_pad_clk_setup() >> >> This is after: >> >> phylink_mac_ops :: mac_config() -> dsa_port_phylink_mac_config() >> -> dsa_switch_ops :: phylink_mac_config() -> mt753x_phylink_mac_config() >> -> mt753x_mac_config() >> -> mt753x_info :: mac_port_config() -> mt7530_mac_config() >> -> mt7530_setup_port5() >> -> mt7530_setup_port6() >> >> Patch 2 does not move mt7530_setup_port6() to be called from >> phylink_mac_ops :: mac_config(), it already is. There is no valid reason to >> reorder the patches. >> >> My response to Russell should've stated this instead of focusing on his >> second sentence. > > This patch moves the test for a 20MHz crystal to mt7530_setup(), > which is something that is entirely orthogonal to patch 2, which > can be done cleanly (I've just applied the patches in the original > order and then reordered them: > > 98c481f5d706 net: dsa: mt7530: do not clear config->supported_interfaces > 93c6b53b17f4 net: dsa: mt7530: correct port capabilities of MT7988 > c9c6d4c51a1d net: dsa: mt7530: simplify mt7530_setup_port6() and change to void > adfa948253e0 net: dsa: mt7530: remove pad_setup function pointer > 57e21e6c2fc0 net: dsa: mt7530: call port 6 setup from mt7530_mac_config() > 959a0f9323c8 net: dsa: mt7530: move XTAL check to mt7530_setup() > 856ab64a22ef net: dsa: mt7530: empty default case on mt7530_setup_port5() > > No problems. The end result is identical comparing the git tree at the > original "move XTAL" patch with adfa948253e0. > > Now, if we look at "net: dsa: mt7530: remove pad_setup function pointer" > we can see that yes, the pad_setup() method was called from mac_confing, > but this is the exact contents of that patch removing the callsite: > > - mt753x_pad_setup(ds, state); > > This returns an integer, which may be an error code, which is ignored. > Therefore, if the XTAL frequency check fires, and mt753x_pad_setup() > returns an error, it is ignored today. > > After "net: dsa: mt7530: call port 6 setup from mt7530_mac_config()" > the renamed pad_setup() method is now called from mac_config() thusly: > > + ret = mt7530_setup_port6(priv->ds, interface); > + if (ret) > + return ret; > > So now the error checks cause mt7530_mac_config() to return an error > which in turn causes mt753x_mac_config() to fail, and therefore > mt753x_phylink_mac_config() has different behaviour. > > So, patch 2 changes the driver behaviour in the case of a 20MHz XTAL, > which is then changed again by patch 4. > > It would be better to have only one change of behaviour by moving > patch 4 before patch 2. If the idea is to not bring any more error returns to mt753x_mac_config() because the return code is actually checked for that, I should do a bit more effort and put patch 5 before patch 2 as well, to live up to what you originally requested. Because, to get rid of all error returns on mt7530_setup_port6(), both "net: dsa: mt7530: move XTAL check to mt7530_setup()" and "net: dsa: mt7530: simplify mt7530_setup_port6() and change to void" patches are needed. After these patches, I can move mt7530_setup_port6() to mt7530_mac_config() and there won't be any error returns being brought under mt753x_mac_config(). pw-bot: cr Arınç