Re: [PATCH V4 3/9] i2c: xiic: Switch to Xiic standard mode for i2c-read

Wolfram Sang
2023-02-03T16:35:59Z

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On Thu, Feb 02, 2023 at 03:11:32PM +0530, Manikanta Guntupalli wrote:
> From: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
>
> Xilinx I2C IP has two modes of operation, both of which implement
> I2C transactions. The only difference from sw perspective is the
> programming sequence for these modes.
> Dynamic mode -> Simple to program, less number of steps in sequence.
> Standard mode -> Gives flexibility, more number of steps in sequence.
>
> In dynamic mode, during the i2c-read transactions, if there is a
> delay(> 200us) between the register writes (address & byte count),
> read transaction fails. On a system with load, this scenario is
> occurring frequently.
> To avoid this, switch to standard mode if there is a read request.
>
> Added a quirk to identify the IP version effected by this and follow
> the standard mode.
>
> Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
> Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
> Acked-by: Michal Simek <michal.simek@amd.com>

Applied to for-next, thanks!

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