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([2a0d:3341:cced:ed10::f39]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-451fb208240sm11589085e9.26.2025.06.05.02.06.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Jun 2025 02:06:56 -0700 (PDT) Message-ID: Date: Thu, 5 Jun 2025 11:06:55 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v2 5/5] net: dsa: b53: do not touch DLL_IQQD on bcm53115 To: Jonas Gorski , Florian Fainelli Cc: Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Vivien Didelot , =?UTF-8?Q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= , netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250602193953.1010487-1-jonas.gorski@gmail.com> <20250602193953.1010487-6-jonas.gorski@gmail.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 6/3/25 8:15 AM, Jonas Gorski wrote: > On Mon, Jun 2, 2025 at 11:40 PM Florian Fainelli > wrote: >> On 6/2/25 12:39, Jonas Gorski wrote: >>> According to OpenMDK, bit 2 of the RGMII register has a different >>> meaning for BCM53115 [1]: >>> >>> "DLL_IQQD 1: In the IDDQ mode, power is down0: Normal function >>> mode" >>> >>> Configuring RGMII delay works without setting this bit, so let's keep it >>> at the default. For other chips, we always set it, so not clearing it >>> is not an issue. >>> >>> One would assume BCM53118 works the same, but OpenMDK is not quite sure >>> what this bit actually means [2]: >>> >>> "BYPASS_IMP_2NS_DEL #1: In the IDDQ mode, power is down#0: Normal >>> function mode1: Bypass dll65_2ns_del IP0: Use >>> dll65_2ns_del IP" >>> >>> So lets keep setting it for now. >>> >>> [1] https://github.com/Broadcom-Network-Switching-Software/OpenMDK/blob/master/cdk/PKG/chip/bcm53115/bcm53115_a0_defs.h#L19871 >>> [2] https://github.com/Broadcom-Network-Switching-Software/OpenMDK/blob/master/cdk/PKG/chip/bcm53118/bcm53118_a0_defs.h#L14392 >>> >>> Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch") >>> Signed-off-by: Jonas Gorski >>> --- >>> v1 -> v2: >>> * new patch >>> >>> drivers/net/dsa/b53/b53_common.c | 8 +++++--- >>> 1 file changed, 5 insertions(+), 3 deletions(-) >>> >>> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c >>> index be4493b769f4..862bdccb7439 100644 >>> --- a/drivers/net/dsa/b53/b53_common.c >>> +++ b/drivers/net/dsa/b53/b53_common.c >>> @@ -1354,8 +1354,7 @@ static void b53_adjust_531x5_rgmii(struct dsa_switch *ds, int port, >>> * tx_clk aligned timing (restoring to reset defaults) >>> */ >>> b53_read8(dev, B53_CTRL_PAGE, off, &rgmii_ctrl); >>> - rgmii_ctrl &= ~(RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC | >>> - RGMII_CTRL_TIMING_SEL); >>> + rgmii_ctrl &= ~(RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC); >> >> Are not we missing a: >> >> if (dev->chip_id != BCM53115_DEVICE_ID) >> rgmii_ctrl &= ~RGMII_CTRL_TIMING_SEL; >> >> here to be strictly identical before/after? > > We could add it for symmetry, but it would be purely decorational. We > unconditionally set this bit again later, so clearing it before has no > actual effect, which is why I didn't add it. Makes sense, and the code in this patch is IMHO more readable. /P