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Groups > linux.kernel > #1698326 > unrolled thread
| Started by | Laura Abbott <labbott@redhat.com> |
|---|---|
| First post | 2017-07-27 23:10 +0200 |
| Last post | 2017-07-28 20:50 +0200 |
| Articles | 6 — 3 participants |
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Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Laura Abbott <labbott@redhat.com> - 2017-07-27 23:10 +0200
Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Tom Bogendoerfer <tsbogend@alpha.franken.de> - 2017-07-27 23:40 +0200
Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Laura Abbott <labbott@redhat.com> - 2017-07-28 00:50 +0200
Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Tom Bogendoerfer <tsbogend@alpha.franken.de> - 2017-07-28 16:30 +0200
Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Laura Abbott <labbott@redhat.com> - 2017-07-28 18:50 +0200
Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces Iyappan Subramanian <isubramanian@apm.com> - 2017-07-28 20:50 +0200
| From | Laura Abbott <labbott@redhat.com> |
|---|---|
| Date | 2017-07-27 23:10 +0200 |
| Subject | Re: [PATCH net] xgene: Don't fail probe, if there is no clk resource for SGMII interfaces |
| Message-ID | <u7YcG-2T1-37@gated-at.bofh.it> |
On 07/13/2017 01:57 AM, Thomas Bogendoerfer wrote:
> From: Thomas Bogendoerfer <tbogendoerfer@suse.de>
>
> This change fixes following problem
>
> [ 1.827940] xgene-enet: probe of 1f210030.ethernet failed with error -2
>
> which leads to a missing ethernet interface (reproducable at least on
> Gigabyte MP30-AR0 and APM Mustang systems).
>
> The check for a valid clk resource fails, because DT doesn't provide a
> clock for sgenet1. But the driver doesn't use this clk, if the ethernet
> port is connected via SGMII. Therefore this patch avoids probing for clk
> on SGMII interfaces.
>
> Fixes: 9aea7779b764 drivers: net: xgene: Fix crash on DT systems
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
> ---
> drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 22 ++++++++++++----------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> index d3906f6b01bd..86058a9f3417 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> @@ -1785,16 +1785,18 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
>
> xgene_enet_gpiod_get(pdata);
>
> - pdata->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(pdata->clk)) {
> - /* Abort if the clock is defined but couldn't be retrived.
> - * Always abort if the clock is missing on DT system as
> - * the driver can't cope with this case.
> - */
> - if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
> - return PTR_ERR(pdata->clk);
> - /* Firmware may have set up the clock already. */
> - dev_info(dev, "clocks have been setup already\n");
> + if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
> + pdata->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(pdata->clk)) {
> + /* Abort if the clock is defined but couldn't be
> + * retrived. Always abort if the clock is missing on
> + * DT system as the driver can't cope with this case.
> + */
> + if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
> + return PTR_ERR(pdata->clk);
> + /* Firmware may have set up the clock already. */
> + dev_info(dev, "clocks have been setup already\n");
> + }
> }
>
> if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
>
This change causes boot failures for me on my APM Mustang system running
Fedora rawhide:
[ 16.669089] Synchronous External Abort: synchronous external abort (0x9600000
[ 16.669099] Internal error: : 96000010 [#1] SMP
[ 16.669103] Modules linked in: xgene_enet(+) at803x realtek mdio_xgene xgenes
[ 16.669127] CPU: 2 PID: 534 Comm: systemd-udevd Not tainted 4.13.0-0.rc1.git1
[ 16.669128] Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang 6
[ 16.669131] task: ffff8003e6f8ce00 task.stack: ffff8003e4fd8000
[ 16.669144] PC is at xgene_enet_wr_mac+0xa0/0x128 [xgene_enet]
[ 16.669152] LR is at xgene_enet_wr_mac+0x64/0x128 [xgene_enet]
<snip>
[ 16.669345] [<ffff000000de19f0>] xgene_enet_wr_mac+0xa0/0x128 [xgene_enet]
[ 16.669354] [<ffff000000de2fc0>] xgene_sgmac_reset+0x28/0x48 [xgene_enet]
[ 16.669362] [<ffff000000de3b50>] xgene_sgmac_init+0x1e0/0x2e8 [xgene_enet]
[ 16.669370] [<ffff000000de8564>] xgene_enet_probe+0xfa4/0x1368 [xgene_enet]
[ 16.669376] [<ffff0000086f14f0>] platform_drv_probe+0x60/0xc0
[ 16.669379] [<ffff0000086ee86c>] driver_probe_device+0x31c/0x458
[ 16.669381] [<ffff0000086eea8c>] __driver_attach+0xe4/0x130
[ 16.669384] [<ffff0000086ebfd4>] bus_for_each_dev+0x5c/0xa8
[ 16.669386] [<ffff0000086edf30>] driver_attach+0x30/0x40
[ 16.669388] [<ffff0000086ed8d0>] bus_add_driver+0x220/0x2c0
[ 16.669390] [<ffff0000086efd04>] driver_register+0x6c/0x118
[ 16.669392] [<ffff0000086f142c>] __platform_driver_register+0x54/0x60
[ 16.669400] [<ffff000000e05014>] xgene_enet_driver_init+0x14/0x1000 [xgene_e]
[ 16.669404] [<ffff000008083834>] do_one_initcall+0x44/0x138
[ 16.669408] [<ffff0000081a327c>] do_init_module+0x64/0x1d0
[ 16.669410] [<ffff0000081a1dc4>] load_module+0x151c/0x1770
[ 16.669413] [<ffff0000081a2330>] SyS_finit_module+0xd8/0xf0
[ 16.669415] [<ffff00000808364c>] __sys_trace_return+0x0/0x4
[ 16.669418] Code: 14000004 d503201f d28218e0 95f24031 (b94002a2)
I suspect the clock is actually needed on some systems.
Thanks,
Laura
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| From | Tom Bogendoerfer <tsbogend@alpha.franken.de> |
|---|---|
| Date | 2017-07-27 23:40 +0200 |
| Message-ID | <u7YFH-33c-1@gated-at.bofh.it> |
| In reply to | #1698326 |
On Thu, Jul 27, 2017 at 02:03:42PM -0700, Laura Abbott wrote: > This change causes boot failures for me on my APM Mustang system running > Fedora rawhide: > > [ 16.669089] Synchronous External Abort: synchronous external abort (0x9600000 > [ 16.669099] Internal error: : 96000010 [#1] SMP > [ 16.669103] Modules linked in: xgene_enet(+) at803x realtek mdio_xgene xgenes > [ 16.669127] CPU: 2 PID: 534 Comm: systemd-udevd Not tainted 4.13.0-0.rc1.git1 > [ 16.669128] Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang 6 > [ 16.669131] task: ffff8003e6f8ce00 task.stack: ffff8003e4fd8000 > [ 16.669144] PC is at xgene_enet_wr_mac+0xa0/0x128 [xgene_enet] > [ 16.669152] LR is at xgene_enet_wr_mac+0x64/0x128 [xgene_enet] on the first glance I don't see anything clock related there. What firmware version is installed on your mustang board ? I saw ethernet related crashes with mustang boards because the device tree in firmware was too old for the xgene ethernet driver. Thoms. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
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| From | Laura Abbott <labbott@redhat.com> |
|---|---|
| Date | 2017-07-28 00:50 +0200 |
| Message-ID | <u7ZLr-3JP-5@gated-at.bofh.it> |
| In reply to | #1698334 |
On 07/27/2017 02:39 PM, Tom Bogendoerfer wrote:
> On Thu, Jul 27, 2017 at 02:03:42PM -0700, Laura Abbott wrote:
>> This change causes boot failures for me on my APM Mustang system running
>> Fedora rawhide:
>>
>> [ 16.669089] Synchronous External Abort: synchronous external abort (0x9600000
>> [ 16.669099] Internal error: : 96000010 [#1] SMP
>> [ 16.669103] Modules linked in: xgene_enet(+) at803x realtek mdio_xgene xgenes
>> [ 16.669127] CPU: 2 PID: 534 Comm: systemd-udevd Not tainted 4.13.0-0.rc1.git1
>> [ 16.669128] Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang 6
>> [ 16.669131] task: ffff8003e6f8ce00 task.stack: ffff8003e4fd8000
>> [ 16.669144] PC is at xgene_enet_wr_mac+0xa0/0x128 [xgene_enet]
>> [ 16.669152] LR is at xgene_enet_wr_mac+0x64/0x128 [xgene_enet]
>
> on the first glance I don't see anything clock related there.
>
I don't know the intricacies of the Mustang hardware but external
aborts have been a symptom of missing clocks on other hardware.
> What firmware version is installed on your mustang board ? I saw
> ethernet related crashes with mustang boards because the device tree
> in firmware was too old for the xgene ethernet driver.
>
> Thoms.
>
TianoCore 3.06.12 UEFI 2.4.0 Aug 12 2016 13:30:51
CPU: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz
32 KB ICACHE, 32 KB DCACHE
SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz
Board: X-Gene Mustang Board
Little Endian build
Slimpro FW:
Ver: 3.5 (build 03.06.12.00 2016/08/12)
PMD: 1000 mV
SOC: 950 mV
Thanks,
Laura
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| From | Tom Bogendoerfer <tsbogend@alpha.franken.de> |
|---|---|
| Date | 2017-07-28 16:30 +0200 |
| Message-ID | <u8er8-4Rs-25@gated-at.bofh.it> |
| In reply to | #1698355 |
On Thu, Jul 27, 2017 at 03:39:58PM -0700, Laura Abbott wrote:
> I don't know the intricacies of the Mustang hardware but external
> aborts have been a symptom of missing clocks on other hardware.
you are right, it's a missing clock. For SGMII ports the driver
doesn't really use the clock source other then doing the one
devm_clk_get(), but this is enough to get the clock going.
Below patch fixes the crash and brings back the second SGMII port
(even without a clock source in device tree, I guess it uses clock
from first port). From a correctness standpoint there should probably
be a clk_prepare_enable(), if port is SGMII.
Could you test the patch ? If it works, I'll submit it.
Thomas.
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index 86058a9f3417..1d307f2def2d 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -1785,9 +1785,9 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
xgene_enet_gpiod_get(pdata);
- if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
- pdata->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(pdata->clk)) {
+ pdata->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pdata->clk)) {
+ if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
/* Abort if the clock is defined but couldn't be
* retrived. Always abort if the clock is missing on
* DT system as the driver can't cope with this case.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
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| From | Laura Abbott <labbott@redhat.com> |
|---|---|
| Date | 2017-07-28 18:50 +0200 |
| Message-ID | <u8gCC-6cX-19@gated-at.bofh.it> |
| In reply to | #1698849 |
On 07/28/2017 07:23 AM, Tom Bogendoerfer wrote:
> On Thu, Jul 27, 2017 at 03:39:58PM -0700, Laura Abbott wrote:
>> I don't know the intricacies of the Mustang hardware but external
>> aborts have been a symptom of missing clocks on other hardware.
>
> you are right, it's a missing clock. For SGMII ports the driver
> doesn't really use the clock source other then doing the one
> devm_clk_get(), but this is enough to get the clock going.
>
> Below patch fixes the crash and brings back the second SGMII port
> (even without a clock source in device tree, I guess it uses clock
> from first port). From a correctness standpoint there should probably
> be a clk_prepare_enable(), if port is SGMII.
>
> Could you test the patch ? If it works, I'll submit it.
>
> Thomas.
>
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> index 86058a9f3417..1d307f2def2d 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> @@ -1785,9 +1785,9 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
>
> xgene_enet_gpiod_get(pdata);
>
> - if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
> - pdata->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(pdata->clk)) {
> + pdata->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(pdata->clk)) {
> + if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
> /* Abort if the clock is defined but couldn't be
> * retrived. Always abort if the clock is missing on
> * DT system as the driver can't cope with this case.
>
Yes, this works. You can add my Tested-by.
Thanks,
Laura
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| From | Iyappan Subramanian <isubramanian@apm.com> |
|---|---|
| Date | 2017-07-28 20:50 +0200 |
| Message-ID | <u8iuJ-7rY-9@gated-at.bofh.it> |
| In reply to | #1698849 |
On Fri, Jul 28, 2017 at 7:23 AM, Tom Bogendoerfer
<tsbogend@alpha.franken.de> wrote:
> On Thu, Jul 27, 2017 at 03:39:58PM -0700, Laura Abbott wrote:
>> I don't know the intricacies of the Mustang hardware but external
>> aborts have been a symptom of missing clocks on other hardware.
>
> you are right, it's a missing clock. For SGMII ports the driver
> doesn't really use the clock source other then doing the one
> devm_clk_get(), but this is enough to get the clock going.
>
> Below patch fixes the crash and brings back the second SGMII port
> (even without a clock source in device tree, I guess it uses clock
> from first port). From a correctness standpoint there should probably
> be a clk_prepare_enable(), if port is SGMII.
>
> Could you test the patch ? If it works, I'll submit it.
>
> Thomas.
>
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> index 86058a9f3417..1d307f2def2d 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> @@ -1785,9 +1785,9 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
>
> xgene_enet_gpiod_get(pdata);
>
> - if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
> - pdata->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(pdata->clk)) {
> + pdata->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(pdata->clk)) {
> + if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
> /* Abort if the clock is defined but couldn't be
> * retrived. Always abort if the clock is missing on
> * DT system as the driver can't cope with this case.
>
> --
Thanks for the patch.
Acked-by: Iyappan Subramanian <isubramanian@apm.com>
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea. [ RFC1925, 2.3 ]
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