linux-kernel - Re: [PATCH] i2c: qcom-geni: fix I2C frequency table to achieve accurate bus rates

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Message-ID: <21ae6a2d-c8dd-4064-a851-6a10649ddf90@quicinc.com>
Date: Fri, 16 May 2025 00:23:46 +0530
From: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
To: Andi Shyti <andi.shyti@...nel.org>,
        Kathiravan Thirumoorthy
	<kathiravan.thirumoorthy@....qualcomm.com>
CC: Viken Dadhaniya <quic_vdadhani@...cinc.com>,
        Manikanta Mylavarapu
	<quic_mmanikan@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>, <linux-i2c@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...nel.org>
Subject: Re: [PATCH] i2c: qcom-geni: fix I2C frequency table to achieve
 accurate bus rates

Thanks Andi !

On 5/14/2025 9:04 PM, Andi Shyti wrote:

[...]
>>   /* source_clock = 32 MHz */
>>   static const struct geni_i2c_clk_fld geni_i2c_clk_map_32mhz[] = {
>> -	{ I2C_MAX_STANDARD_MODE_FREQ, 8, 14, 18, 40 },
>> -	{ I2C_MAX_FAST_MODE_FREQ, 4,  3, 11, 20 },
>> -	{ I2C_MAX_FAST_MODE_PLUS_FREQ, 2, 3,  6, 15 },
>> +	{ I2C_MAX_STANDARD_MODE_FREQ, 8, 14, 18, 38 },
>> +	{ I2C_MAX_FAST_MODE_FREQ, 4,  3, 9, 19 },
>> +	{ I2C_MAX_FAST_MODE_PLUS_FREQ, 2, 3, 5, 15 },
> 
> argh!
> 
> Can someone from Qualcomm look at this fix? Mukesh, Viken?
Yes, I am reviewing internally and verifying the same with latest 
Guidance and updates. Let me update on this once reviewed.
> 
> Thanks,
> Andi
> 
>>   	{}
>>   };
>>   
>>
>> ---
>> base-commit: edef457004774e598fc4c1b7d1d4f0bcd9d0bb30
>> change-id: 20250513-i2c-bus-freq-ac46343869a4
>>
>> Best regards,
>> -- 
>> Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
>>