Re: [PATCH v3 net-next] net: ethernet: cadence-macb: Add disabled usrio caps
From: Nicolas Ferre <hidden>
Date: 2016-01-04 09:24:40
Also in:
lkml
Le 04/01/2016 10:01, Neil Armstrong a écrit :
On some platforms, the macb integration does not use the USRIO register to configure the (R)MII port and clocks. When the register is not implemented and the MACB error signal is connected to the bus error, reading or writing to the USRIO register can trigger some Imprecise External Aborts on ARM platforms. Signed-off-by: Neil Armstrong <redacted> --- drivers/net/ethernet/cadence/macb.c | 27 +++++++++++++++------------ drivers/net/ethernet/cadence/macb.h | 1 + 2 files changed, 16 insertions(+), 12 deletions(-) Nicolas, I post only the first patch of the previous set posted here : http://lkml.kernel.org/r/1449582726-6148-1-git-send-email-narmstrong@baylibre.com to hopefully make it into the 4.5 merge time, I'll post the vendor prefix once this patch will hit mainline.
Okay, but I don't see how you will activate this capability (or I lost track of it). So, before I can accept one solution, can you please repost the whole solution as a v4. Thanks. Bye,
quoted hunk ↗ jump to hunk
Regards, Neildiff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 8b45bc9..fa53bc3 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c@@ -2124,7 +2124,8 @@ static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs, regs_buff[10] = macb_tx_dma(&bp->queues[0], tail); regs_buff[11] = macb_tx_dma(&bp->queues[0], head); - regs_buff[12] = macb_or_gem_readl(bp, USRIO); + if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) + regs_buff[12] = macb_or_gem_readl(bp, USRIO); if (macb_is_gem(bp)) { regs_buff[13] = gem_readl(bp, DMACFG); }@@ -2403,19 +2404,21 @@ static int macb_init(struct platform_device *pdev) dev->hw_features &= ~NETIF_F_SG; dev->features = dev->hw_features; - val = 0; - if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) - val = GEM_BIT(RGMII); - else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII && - (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII)) - val = MACB_BIT(RMII); - else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII)) - val = MACB_BIT(MII); + if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) { + val = 0; + if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) + val = GEM_BIT(RGMII); + else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII && + (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII)) + val = MACB_BIT(RMII); + else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII)) + val = MACB_BIT(MII); - if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN) - val |= MACB_BIT(CLKEN); + if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN) + val |= MACB_BIT(CLKEN); - macb_or_gem_writel(bp, USRIO, val); + macb_or_gem_writel(bp, USRIO, val); + } /* Set MII management clock divider */ val = macb_mdc_clk_div(bp);diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 5c03e81..0d4ecfc 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h@@ -400,6 +400,7 @@ #define MACB_CAPS_USRIO_HAS_CLKEN 0x00000002 #define MACB_CAPS_USRIO_DEFAULT_IS_MII 0x00000004 #define MACB_CAPS_NO_GIGABIT_HALF 0x00000008 +#define MACB_CAPS_USRIO_DISABLED 0x00000010 #define MACB_CAPS_FIFO_MODE 0x10000000 #define MACB_CAPS_GIGABIT_MODE_AVAILABLE 0x20000000 #define MACB_CAPS_SG_DISABLED 0x40000000
-- Nicolas Ferre