From patchwork Fri Feb 21 14:15:17 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King (Oracle)" X-Patchwork-Id: 13985632 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 5628AC021B3 for ; Fri, 21 Feb 2025 14:39:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Date:Message-Id:MIME-Version:Subject:Cc :To:From:References:In-Reply-To:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=P2MnzA8Qh/MFyyMutL0ImIR7QgdeQnc5s5lq7oX0QEA=; b=kVGNWP2D3K8vV8 3QK5C5L8Z9CuPF8lHYp5hqb49bL/fUu6sD4H5+MKJDPnP4XMSSvWg0bOf6Pk51R98iTjWj32Hz0Tk /0f1lypvLJUsWg9Wp7vR1poirKKXm8T+P39DLjW0Z1652QSJnkqoURDglGs+3jWUa2L4NdgGSlrrj JRJ+m7II8/OFb4inS5uNoANGHHV7SA76oX4S20TRPhwxTki2ku0w14PsDYS4k/kA95AOxl5kHBCKL TqqmXI/Sv/Nn5xZBzrWHyn8WQxr+IahPVqng+N8IAuV2/FR1WsHzcRJKrzYgiZ1Dh31Eyk5EJuQMP wWOFSQ7CAAiSJ+8aqdpg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tlUBi-00000005r58-3k8f; Fri, 21 Feb 2025 14:39:34 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tlTqc-00000005n8S-0JRG; Fri, 21 Feb 2025 14:17:47 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=YmtTGwJJXhwMoenv9f1jJWRnRB0B2anyfjKqb6F0t6g=; b=i7UoQF2blTPs6VW1UGIaXkZX+k IJh5rrOMM3jtyTYE0yyIPfqvAgr5J7kr8tlhOag8TsD7uog8dTn/hrI9Zonguyry25QPpZ6Macig8 Hnfw5IrCLzLsHbISCogcINMGXG0py/E+l9QG6MhzVO2xlW5UhzyKnu3PEP0H0JRM4QI1524TREqMO tV9vQsuHBH7ZBNmMBz9SoBHIM1/vgqeF6ghyFxiJBucJK2OlbNDI03ABq7My+5Y2QHYmErA/5CQsd UBZEl6/LX14f1p5R6sq5zrh3OTMqFZRvRu8MJh3bAJVUpaeM9S93akICrUQNRteaalKd0QlFOXt0x Gp6cO1Pw==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:50498 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tlToX-0004o0-1B; Fri, 21 Feb 2025 14:15:37 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1tlToD-004W3g-HB; Fri, 21 Feb 2025 14:15:17 +0000 In-Reply-To: References: From: "Russell King (Oracle)" To: Andrew Lunn , Heiner Kallweit Cc: Alexandre Torgue , Andrew Lunn , "David S. Miller" , Drew Fustini , Eric Dumazet , Fu Wei , Guo Ren , Jakub Kicinski , linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, Maxime Coquelin , netdev@vger.kernel.org, Paolo Abeni Subject: [PATCH net-next 2/2] net: stmmac: thead: ensure divisor gives proper rate MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Fri, 21 Feb 2025 14:15:17 +0000 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250221_061746_107008_BC5408AC X-CRM114-Status: UNSURE ( 9.80 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org thead was checking that the stmmac_clk rate was a multiple of the RGMII rates for 1G and 100M, but didn't check for 10M. Rather than use this with hard-coded speeds, check that the calculated divisor gives the required rate by multplying the transmit clock rate back up to the stmmac clock rate and checking that it agrees. Signed-off-by: Russell King (Oracle) --- drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c index f16fa341aadb..f9f2bd65959f 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c @@ -45,9 +45,6 @@ #define TXCLK_DIR_OUTPUT FIELD_PREP(TXCLK_DIR_MASK, 0) #define TXCLK_DIR_INPUT FIELD_PREP(TXCLK_DIR_MASK, 1) -#define GMAC_GMII_RGMII_RATE 125000000 -#define GMAC_MII_RATE 25000000 - struct thead_dwmac { struct plat_stmmacenet_data *plat; void __iomem *apb_base; @@ -124,11 +121,6 @@ static void thead_dwmac_fix_speed(void *priv, int speed, unsigned int mode) case PHY_INTERFACE_MODE_RGMII_RXID: case PHY_INTERFACE_MODE_RGMII_TXID: rate = clk_get_rate(plat->stmmac_clk); - if (!rate || rate % GMAC_GMII_RGMII_RATE != 0 || - rate % GMAC_MII_RATE != 0) { - dev_err(dwmac->dev, "invalid gmac rate %ld\n", rate); - return; - } writel(0, dwmac->apb_base + GMAC_PLLCLK_DIV); @@ -139,6 +131,10 @@ static void thead_dwmac_fix_speed(void *priv, int speed, unsigned int mode) } div = rate / tx_rate; + if (rate != tx_rate * div) { + dev_err(dwmac->dev, "invalid gmac rate %lu\n", rate); + return; + } reg = FIELD_PREP(GMAC_PLLCLK_DIV_EN, 1) | FIELD_PREP(GMAC_PLLCLK_DIV_NUM, div);