linux-kernel - Re: [PATCH v1 1/2] i2c: designware-pci: Add support for Fast Mode Plus and High Speed Mode

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Message-ID: <042d2c9f-4333-44b1-09c0-b0953a51c176@linux.intel.com>
Date:   Tue, 30 Nov 2021 09:51:42 +0200
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Wolfram Sang <wsa@...nel.org>, lakshmi.sowjanya.d@...el.com,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        bala.senthil@...el.com, pandith.n@...el.com
Subject: Re: [PATCH v1 1/2] i2c: designware-pci: Add support for Fast Mode
 Plus and High Speed Mode

On 11/29/21 6:56 PM, Wolfram Sang wrote:
> On Tue, Nov 09, 2021 at 04:05:51PM +0530, lakshmi.sowjanya.d@...el.com wrote:
>> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>
>>
>> Add support to configure HCNT, LCNT values for Fast Mode Plus and High
>> Speed Mode.
>>
>> Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>
> 
> Applied to for-next, thanks!
> 
>> +	u32 fp_lcnt;
>> +	u32 hs_lcnt;
>>   	u32 sda_hold;
> 
> Short question unrelated to this patch. Why are all these u32...
> 
>>   		dev->ss_hcnt = cfg->ss_hcnt;
>>   		dev->fs_hcnt = cfg->fs_hcnt;
> 
> ... and the ones in dev are u16? Wouldn't it be easier if they all had
> the same type?
> 
True, only sda_hold(_time) is u32 and other timing parameters are u16.

Lakshmi: Would you like to send a patch fixing this and get more 
contributions to the driver :-)

Originally this discrepancy was introduced 2014 by the commit 
8efd1e9ee3bd ("i2c: designware-pci: set ideal HCNT, LCNT and SDA hold 
time value").

Jarkko