linux-kernel - Re: [RFC PATCH 1/3] libahci: save port map for forced port map

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Date:	Thu, 31 Mar 2016 16:58:27 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-ide@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Andy Gross <andy.gross@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, jmaggard10@...il.com
Subject: Re: [RFC PATCH 1/3] libahci: save port map for forced port map



On 30/03/16 19:57, Tejun Heo wrote:
> Hello,
>
> On Tue, Mar 29, 2016 at 02:11:13PM +0100, Srinivas Kandagatla wrote:
>> In usecases where force_port_map is used saved_port_map is never set,
>> resulting in not programming the PORTS_IMPL register as part of intial
>> config. This patch fixes this by setting it to port_map even in case
>> where force_port_map is used, making it more inline with other parts of
>> the code.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>>   drivers/ata/libahci.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
>> index 3982054..a5d7c1c 100644
>> --- a/drivers/ata/libahci.c
>> +++ b/drivers/ata/libahci.c
>> @@ -507,6 +507,7 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
>>   		dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
>>   			 port_map, hpriv->force_port_map);
>>   		port_map = hpriv->force_port_map;
>> +		hpriv->saved_port_map = port_map;
>
> So, the only change it'd cause is making the driver write the forced
> value to the PI register.  Does that make sense?

Yes, that is the intention, I guess, This was done exactly in case where 
the port number was fabricated too.

Without this I could not get the sata working on my board with forced 
port map option.

--srini


>
> Thanks.
>