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Message-ID: <20230522095401.szzugrjohnwyqffk@skbuf> Date: Mon, 22 May 2023 12:54:01 +0300 From: Vladimir Oltean <olteanv@...il.com> To: David Epping <david.epping@...singlinkelectronics.com> Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com Subject: Re: [PATCH net 3/3] net: phy: mscc: enable VSC8501/2 RGMII RX clock On Mon, May 22, 2023 at 12:49:44PM +0300, Vladimir Oltean wrote: > Well, to be clear, I was suggesting: > > /* Set the RGMII RX and TX clock skews individually, according to the PHY > * interface type, to: > * * 0.2 ns (their default, and lowest, hardware value) if delays should > * not be enabled > * * 2.0 ns (which causes the data to be sampled at exactly half way between > * clock transitions at 1000 Mbps) if delays should be enabled > */ > static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl, > u16 rgmii_rx_delay_mask, > u16 rgmii_tx_delay_mask) > { > u16 rgmii_rx_delay_pos = ffs(rgmii_rx_delay_mask) - 1; > u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1; > u16 mask = rgmii_rx_delay_mask | rgmii_tx_delay_mask; > u16 reg_val = 0; > int rc; Or rather: u16 mask = 0; if (phy_interface_is_rgmii(phydev)) mask |= rgmii_rx_delay_mask | rgmii_tx_delay_mask; if (rgmii_cntl == VSC8502_RGMII_CNTL) mask |= VSC8502_RGMII_RX_CLK_DISABLE; > > /* For traffic to pass, the VSC8502 family needs the RX_CLK disable bit > * to be unset for all PHY modes, so do that as part of the paged > * register modification. > */ > if (rgmii_cntl == VSC8502_RGMII_CNTL) > mask |= VSC8502_RGMII_RX_CLK_DISABLE; > > mutex_lock(&phydev->lock); > > if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID || > phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) > reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_rx_delay_pos; > if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID || > phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) > reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_tx_delay_pos; > > rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2, > rgmii_cntl, mask, reg_val); > > mutex_unlock(&phydev->lock); > > return rc; > }
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