netdev - Re: [PATCH] Stmmac: fix a bug when clk

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Message-ID: <52557355.2000107@st.com>
Date:	Wed, 9 Oct 2013 17:16:37 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Wan ZongShun <mcuos.com@...il.com>
Cc:	<netdev@...r.kernel.org>
Subject: Re: [PATCH] Stmmac: fix a bug when clk_csr == 0x0

On 10/9/2013 5:02 PM, Wan ZongShun wrote:
> 2013/10/9 Giuseppe CAVALLARO <peppe.cavallaro@...com>:
>> hello
>>
>>
>> On 10/9/2013 4:37 AM, Wan ZongShun wrote:
>>>
>>> Hi Giuseppe,
>>>
>>> According to spec, if csr clock freq is 60-100Mhz, we have to set CR[5:2]
>>> = 0000
>>> but when I set the 'plat_dat.clk_csr = 0',acctually, this value is not
>>> used
>>> since the driver code judge 'if (!priv->plat->clk_csr)' then go to dynamic
>>> tune
>>> the MDC clock. So I add other judge condition.
>>
>>
>> yes, and true in case of 60-100Mhz... I don't know if this was actually
>> tested on SPEAr long time ago.
>>
>
> Hmmm, I am using other GBE chip based on synopsis IP, so I am testing
> it on other platform.
>
>> Pls document the new platform field in the stmmac.txt or find a way
>> to reuse the clk_csr (maybe not the case)
>
> Do you mean I need submit the other patch to add some comments for
> this new field？

yes in the Documentation/networking/stmmac.txt

peppe

> I can not find better way to fix this issue and make it more
> compatible to another platform.
>
> Wan.
>
>>
>> peppe
>>
>>
>>>
>>> Signed-off-by: Wan Zongshun <mcuos.com@...il.com>
>>> ---
>>>    drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
>>>    include/linux/stmmac.h                            | 1 +
>>>    2 files changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> index 8d4ccd3..a849092c 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> @@ -2741,7 +2741,7 @@ struct stmmac_priv *stmmac_dvr_probe(struct
>>> device *device,
>>>         * set the MDC clock dynamically according to the csr actual
>>>         * clock input.
>>>         */
>>> -    if (!priv->plat->clk_csr)
>>> +    if (priv->plat->dynamic_mdc_clk_en)
>>>            stmmac_clk_csr_set(priv);
>>>        else
>>>            priv->clk_csr = priv->plat->clk_csr;
>>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>>> index bb5deb0..e2552ce 100644
>>> --- a/include/linux/stmmac.h
>>> +++ b/include/linux/stmmac.h
>>> @@ -101,6 +101,7 @@ struct plat_stmmacenet_data {
>>>        struct stmmac_mdio_bus_data *mdio_bus_data;
>>>        struct stmmac_dma_cfg *dma_cfg;
>>>        int clk_csr;
>>> +    int dynamic_mdc_clk_en;
>>>        int has_gmac;
>>>        int enh_desc;
>>>        int tx_coe;
>>>
>>
>
>
>

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