Date:   Tue, 13 Dec 2016 09:46:35 +0100
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <netdev@...r.kernel.org>
Subject: Re: stmmac DT property snps,axi_all

On 12/13/2016 9:26 AM, Niklas Cassel wrote:
> On 12/13/2016 07:47 AM, Giuseppe CAVALLARO wrote:
>> Hello Niklas, Alex,
>>
>> my fault and a step behind... Current code is OK
>> when manage the AAL that, although it is passed from
>> the axi structure, it is always used to program,
>> for all the chip versions, the writable bit inside the
>> DMA_BUS_MODE register.
>> So I guess no extra patch is needed.
>
> Hello Giuseppe
>
> I'm not sure what you mean.
>
> Yes, when setting "snps,aal",
> the code is correct for all versions of the IP.
>
> However, "snps,axi_all" seems to just be dead code.
> Try git grep in the whole tree.
> So I still think that my patch is valid.

ok there is the snps,aal, proceed with your patch and
add my Acked-by. Sorry for this traffic but I am trying
to keep myself aligned with all these new patches.

So, IIUC, you have some new patch for TX Timer; pls
do not forget to add me on copy.

Regards
Peppe

>
>
>>
>> Regards
>> Peppe
>>
>> On 12/12/2016 3:18 PM, Giuseppe CAVALLARO wrote:
>>> Please Niklas
>>>
>>> when you send the patch, add my
>>>
>>> Acked-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
>>>
>>>
>>> On 12/9/2016 10:53 AM, Niklas Cassel wrote:
>>>> On 12/09/2016 10:20 AM, Niklas Cassel wrote:
>>>>> On 12/08/2016 02:36 PM, Alexandre Torgue wrote:
>>>>>> Hi Niklas,
>>>>>>
>>>>>> On 12/05/2016 05:18 PM, Niklas Cassel wrote:
>>>>>>> Hello Giuseppe
>>>>>>>
>>>>>>>
>>>>>>> I'm trying to figure out what snps,axi_all is supposed to represent.
>>>>>>>
>>>>>>> It appears that the value is saved, but never used in the code.
>>>>>>>
>>>>>>> Looking at the register specification, I'm guessing that it represents
>>>>>>> Address-Aligned Beats, but there is already the property snps,aal
>>>>>>> for that.
>>>>>> IMO, it is not useful. Indeed AXI_AAL is a read only bit (in AXI bus
>>>>>> mode register) and reflects the aal bit in DMA bus register.
>>>>>> As you know we use "snps,aal" to set aal bit in DMA bus register.
>>>>>> So "snps,axi_all" entry seems useless. Let's see with Peppe.
>>>>> Ok, I see. GMAC and GMAC4 is different here.
>>>>>
>>>>> For GMAC4 AAL only exists in DMA_SYS_BUS_MODE.
>>>>> It's not reflected anywhere else.
>>>>>
>>>>> The code is correct in the driver.
>>>>>
>>>>> If snps,axi_all is just created for a read-only register,
>>>>> and it is currently never used in the code,
>>>>> while we have snps,aal, which is correct and works,
>>>>> I guess it should be ok to remove snps,axi_all.
>>>>>
>>>>> I can cook up a patch.
>>>>>
>>>>
>>>> Here we go :)
>>>>
>>>> I will send it as a real patch once net-next reopens.
>>>>
>>>>
>>>>> From defc01cb7c22611b89d9cf1fcae72544092bd62c Mon Sep 17 00:00:00 2001
>>>> From: Niklas Cassel <niklas.cassel@...s.com>
>>>> Date: Fri, 9 Dec 2016 10:27:00 +0100
>>>> Subject: [PATCH net-next] net: stmmac: remove unused duplicate property
>>>>  snps,axi_all
>>>>
>>>> For core revision 3.x Address-Aligned Beats is available in two
>>>> registers.
>>>> The DT property snps,aal was created for AAL in the DMA bus register,
>>>> which is a read/write bit.
>>>> The DT property snps,axi_all was created for AXI_AAL in the AXI bus mode
>>>> register, which is a read only bit that reflects the value of AAL in the
>>>> DMA bus register.
>>>>
>>>> Since the value of snps,axi_all is never used in the driver,
>>>> and since the property was created for a bit that is read only,
>>>> it should be safe to remove the property.
>>>>
>>>> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
>>>> ---
>>>>  Documentation/devicetree/bindings/net/stmmac.txt      | 1 -
>>>>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 -
>>>>  include/linux/stmmac.h                                | 1 -
>>>>  3 files changed, 3 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt
>>>> b/Documentation/devicetree/bindings/net/stmmac.txt
>>>> index 128da752fec9..c3d2fd480a1b 100644
>>>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>>>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>>>> @@ -65,7 +65,6 @@ Optional properties:
>>>>      - snps,wr_osr_lmt: max write outstanding req. limit
>>>>      - snps,rd_osr_lmt: max read outstanding req. limit
>>>>      - snps,kbbe: do not cross 1KiB boundary.
>>>> -    - snps,axi_all: align address
>>>>      - snps,blen: this is a vector of supported burst length.
>>>>      - snps,fb: fixed-burst
>>>>      - snps,mb: mixed-burst
>>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> index 082cd48db6a7..60ba8993c650 100644
>>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> @@ -121,7 +121,6 @@ static struct stmmac_axi *stmmac_axi_setup(struct
>>>> platform_device *pdev)
>>>>      axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
>>>>      axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
>>>>      axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe");
>>>> -    axi->axi_axi_all = of_property_read_bool(np, "snps,axi_all");
>>>>      axi->axi_fb = of_property_read_bool(np, "snps,axi_fb");
>>>>      axi->axi_mb = of_property_read_bool(np, "snps,axi_mb");
>>>>      axi->axi_rb =  of_property_read_bool(np, "snps,axi_rb");
>>>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>>>> index 266dab9ad782..889e0e9a3f1c 100644
>>>> --- a/include/linux/stmmac.h
>>>> +++ b/include/linux/stmmac.h
>>>> @@ -103,7 +103,6 @@ struct stmmac_axi {
>>>>      u32 axi_wr_osr_lmt;
>>>>      u32 axi_rd_osr_lmt;
>>>>      bool axi_kbbe;
>>>> -    bool axi_axi_all;
>>>>      u32 axi_blen[AXI_BLEN];
>>>>      bool axi_fb;
>>>>      bool axi_mb;
>>>>
>>>
>>>
>>
>
>

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