linux-kernel - Re: [PATCH] net: ethernet: stmmac: Fix altr_tse

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Date:   Thu, 1 Jun 2017 08:08:57 +0200
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     <thor.thayer@...ux.intel.com>, <alexandre.torgue@...com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: ethernet: stmmac: Fix altr_tse_pcs SGMII
 Initialization

On 5/31/2017 9:28 PM, thor.thayer@...ux.intel.com wrote:
> From: Thor Thayer <thor.thayer@...ux.intel.com>
>
> Fix NETDEV WATCHDOG timeout on startup by adding missing register
> writes that properly setup SGMII.
>
> Signed-off-by: Thor Thayer <thor.thayer@...ux.intel.com>
Thanks a lot for this fix.

Acked-by: Giuseppe Cavallaro <peppe.cavallaro@...com>

> ---
>   drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
> index 489ef14..6a9c954 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
> @@ -37,6 +37,7 @@
>   #define TSE_PCS_CONTROL_AN_EN_MASK			BIT(12)
>   #define TSE_PCS_CONTROL_REG				0x00
>   #define TSE_PCS_CONTROL_RESTART_AN_MASK			BIT(9)
> +#define TSE_PCS_CTRL_AUTONEG_SGMII			0x1140
>   #define TSE_PCS_IF_MODE_REG				0x28
>   #define TSE_PCS_LINK_TIMER_0_REG			0x24
>   #define TSE_PCS_LINK_TIMER_1_REG			0x26
> @@ -65,6 +66,7 @@
>   #define TSE_PCS_SW_RESET_TIMEOUT			100
>   #define TSE_PCS_USE_SGMII_AN_MASK			BIT(1)
>   #define TSE_PCS_USE_SGMII_ENA				BIT(0)
> +#define TSE_PCS_IF_USE_SGMII				0x03
>   
>   #define SGMII_ADAPTER_CTRL_REG				0x00
>   #define SGMII_ADAPTER_DISABLE				0x0001
> @@ -101,7 +103,9 @@ int tse_pcs_init(void __iomem *base, struct tse_pcs *pcs)
>   {
>   	int ret = 0;
>   
> -	writew(TSE_PCS_USE_SGMII_ENA, base + TSE_PCS_IF_MODE_REG);
> +	writew(TSE_PCS_IF_USE_SGMII, base + TSE_PCS_IF_MODE_REG);
> +
> +	writew(TSE_PCS_CTRL_AUTONEG_SGMII, base + TSE_PCS_CONTROL_REG);
>   
>   	writew(TSE_PCS_SGMII_LINK_TIMER_0, base + TSE_PCS_LINK_TIMER_0_REG);
>   	writew(TSE_PCS_SGMII_LINK_TIMER_1, base + TSE_PCS_LINK_TIMER_1_REG);