linux-kernel - Re: [PATCH] net: eth: xgene: fix booting with devicetree

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Message-ID: <CAL85gmCWD344JgzTrr3KD2OP_8SiFgQyo-CAUas557DwfBW1bQ@mail.gmail.com>
Date:	Wed, 4 Mar 2015 10:46:55 -0800
From:	Feng Kan <fkan@....com>
To:	Mark Salter <msalter@...hat.com>
Cc:	Iyappan Subramanian <isubramanian@....com>, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: eth: xgene: fix booting with devicetree

On Wed, Mar 4, 2015 at 8:51 AM, Mark Salter <msalter@...hat.com> wrote:
> Commit de7b5b3d790a ("net: eth: xgene: change APM X-Gene SoC platform
> ethernet to support ACPI") breaks booting with devicetree with UEFI
> firmware. In that case, I get:
>
> Unhandled fault: synchronous external abort (0x96000010) at 0xfffffc0000620010
>  Internal error: : 96000010 [#1] SMP
>  Modules linked in: vfat fat xfs libcrc32c ahci_xgene libahci_platform libahci
>  CPU: 7 PID: 634 Comm: NetworkManager Not tainted 4.0.0-rc1+ #4
>  Hardware name: AppliedMicro Mustang/Mustang, BIOS 1.1.0-rh-0.14 Mar  1 2015
>  task: fffffe03d4c7e100 ti: fffffe03d4e24000 task.ti: fffffe03d4e24000
>  PC is at xgene_enet_rd_mcx_mac.isra.11+0x58/0xd4
>  LR is at xgene_gmac_tx_enable+0x2c/0x50
>  pc : [<fffffe000069d6fc>] lr : [<fffffe000069dcc4>] pstate: 80000145
>  sp : fffffe03d4e27590
>  x29: fffffe03d4e27590 x28: 0000000000000000
>  x27: fffffe03d4e277c0 x26: fffffe03da8fda10
>  x25: fffffe03d4e2760c x24: fffffe03d49e28c0
>  x23: fffffc0000620004 x22: 0000000000000000
>  x21: fffffc0000620000 x20: fffffc0000620010
>  x19: 000000000000000b x18: 000003ffd4a96020
>  x17: 000003ff7fc1f7a0 x16: fffffe000079b9cc
>  x15: 0000000000000000 x14: 0000000000000000
>  x13: 0000000000000000 x12: fffffe03d4e24000
>  x11: fffffe03d4e27da0 x10: 0000000000000001
>  x9 : 0000000000000000 x8 : fffffe03d4e27a20
>  x7 : 0000000000000000 x6 : 00000000ffffffef
>  x5 : fffffe000105f7d0 x4 : fffffe00007ca8c8
>  x3 : fffffe03d4e2760c x2 : 0000000000000000
>  x1 : fffffc0000620000 x0 : 0000000040000000
>
>  Process NetworkManager (pid: 634, stack limit = 0xfffffe03d4e24028)
>  Stack: (0xfffffe03d4e27590 to 0xfffffe03d4e28000)
>  ...
>  Call trace:
>  [<fffffe000069d6fc>] xgene_enet_rd_mcx_mac.isra.11+0x58/0xd4
>  [<fffffe000069dcc0>] xgene_gmac_tx_enable+0x28/0x50
>  [<fffffe00006a112c>] xgene_enet_open+0x2c/0x130
>  [<fffffe00007b9254>] __dev_open+0xc8/0x148
>  [<fffffe00007b956c>] __dev_change_flags+0x90/0x158
>  [<fffffe00007b9664>] dev_change_flags+0x30/0x70
>  [<fffffe00007c8ab8>] do_setlink+0x278/0x870
>  [<fffffe00007c95bc>] rtnl_newlink+0x404/0x6a8
>  [<fffffe00007c8040>] rtnetlink_rcv_msg+0x98/0x218
>  [<fffffe00007e78e4>] netlink_rcv_skb+0xe0/0xf8
>  [<fffffe00007c7f94>] rtnetlink_rcv+0x30/0x44
>  [<fffffe00007e6f2c>] netlink_unicast+0xfc/0x210
>  [<fffffe00007e75b8>] netlink_sendmsg+0x498/0x5ac
>  [<fffffe00007990b8>] do_sock_sendmsg+0xa4/0xcc
>  [<fffffe000079a958>] ___sys_sendmsg+0x1fc/0x208
>  [<fffffe000079b984>] __sys_sendmsg+0x4c/0x94
>  [<fffffe000079b9f8>] SyS_sendmsg+0x2c/0x3c
>
> The problem here is that the enet hw clocks are not getting
> initialized because of a test to avoid the initialization if
> UEFI is used to boot. This is an incorrect test. When booting
> with UEFI and devicetree, the kernel must still initialize
> the enet hw clocks. If booting with ACPI, the clock hw is
> not exposed to the kernel and it is that case where we want
> to avoid initializing clocks.
>
> Signed-off-by: Mark Salter <msalter@...hat.com>
> ---
>  drivers/net/ethernet/apm/xgene/xgene_enet_hw.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> index 869d97f..b927021 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
> @@ -593,7 +593,7 @@ static int xgene_enet_reset(struct xgene_enet_pdata *pdata)
>         if (!xgene_ring_mgr_init(pdata))
>                 return -ENODEV;
>
> -       if (!efi_enabled(EFI_BOOT)) {
> +       if (pdata->clk) {
>                 clk_prepare_enable(pdata->clk);
>                 clk_disable_unprepare(pdata->clk);
>                 clk_prepare_enable(pdata->clk);

Acked-by: Feng Kan <fkan@....com>
> --
> 1.8.3.1
>
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