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 69A40C433F5 for ; Wed, 24 Nov 2021 13:12:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347501AbhKXNP5 (ORCPT ); Wed, 24 Nov 2021 08:15:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:52064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348017AbhKXNMP (ORCPT ); Wed, 24 Nov 2021 08:12:15 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3948F61241; Wed, 24 Nov 2021 12:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637757750; bh=TWKIcLk6ahcvQz2WQDufqyNtj8pR42nGeM2bvmPsr68=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eug1KiMkZuqxORF2YqHnLGcK46eh7MfClwyttm0mWHgSnMvAbccso09atPHFlTJQG +HEN24Sz03g3i60La3thMO8KKUdbaZZ683L8fmBgJlxoOsZCZ7nJ/Y1HNEnRuy3frC rr20+NzQ0vi/tnyvRtvaykYoa0XNTNkHGbDonMUE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maxim Kiselev , Grygorii Strashko , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.19 221/323] net: davinci_emac: Fix interrupt pacing disable Date: Wed, 24 Nov 2021 12:56:51 +0100 Message-Id: <20211124115726.394339072@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115718.822024889@linuxfoundation.org> References: <20211124115718.822024889@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Maxim Kiselev [ Upstream commit d52bcb47bdf971a59a2467975d2405fcfcb2fa19 ] This patch allows to use 0 for `coal->rx_coalesce_usecs` param to disable rx irq coalescing. Previously we could enable rx irq coalescing via ethtool (For ex: `ethtool -C eth0 rx-usecs 2000`) but we couldn't disable it because this part rejects 0 value: if (!coal->rx_coalesce_usecs) return -EINVAL; Fixes: 84da2658a619 ("TI DaVinci EMAC : Implement interrupt pacing functionality.") Signed-off-by: Maxim Kiselev Reviewed-by: Grygorii Strashko Link: https://lore.kernel.org/r/20211101152343.4193233-1-bigunclemax@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/ti/davinci_emac.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c index 56130cf293f37..566da1e3cfbcc 100644 --- a/drivers/net/ethernet/ti/davinci_emac.c +++ b/drivers/net/ethernet/ti/davinci_emac.c @@ -426,8 +426,20 @@ static int emac_set_coalesce(struct net_device *ndev, u32 int_ctrl, num_interrupts = 0; u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0; - if (!coal->rx_coalesce_usecs) - return -EINVAL; + if (!coal->rx_coalesce_usecs) { + priv->coal_intvl = 0; + + switch (priv->version) { + case EMAC_VERSION_2: + emac_ctrl_write(EMAC_DM646X_CMINTCTRL, 0); + break; + default: + emac_ctrl_write(EMAC_CTRL_EWINTTCNT, 0); + break; + } + + return 0; + } coal_intvl = coal->rx_coalesce_usecs; -- 2.33.0