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id 1jutxz-0007kb-OG; Mon, 13 Jul 2020 01:37:40 -0700 Subject: Re: [PATCH 5/5] i2c: xiic: Only ever transfer single message To: Wolfram Sang , Marek Vasut Cc: linux-i2c@vger.kernel.org, Michal Simek , Shubhrajyoti Datta References: <20200613150751.114595-1-marex@denx.de> <20200613150751.114595-5-marex@denx.de> <20200613193333.GA6289@kunai> <20200613194220.GB6289@kunai> From: Michal Simek Autocrypt: addr=michals@xilinx.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 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X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR02MB4923 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ceNvNxLqJALj7W92fFJjb5zAE7giUZV30 Content-Type: multipart/mixed; boundary="c1bb1RxfbBUH4KlR4U8NHXk2zSyOz97v0" --c1bb1RxfbBUH4KlR4U8NHXk2zSyOz97v0 Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 13. 06. 20 21:42, Wolfram Sang wrote: >=20 >>>> Transferring multiple messages via XIIC suffers from strange interac= tion >>>> between the interrupt status/enable register flags. These flags are = being >>>> reused in the hardware to indicate different things for read and wri= te >>>> transfer, and doing multiple transactions becomes horribly complex. = Just >>>> send a single transaction and reload the controller with another mes= sage >>>> once the transaction is done in the interrupt handler thread. >>> >>> Do we still get a repeated start between messages of a transfer? Or w= ill >>> it be a STOP/START combination? >> >> Repeated start. >=20 > Good. That was my high level question. I'll leave the rest of the revie= w > then for Michal. >=20 I have read all reviews in this thread and there should be update on 4/5 and discussion around 2/5 is not done. That's why please send 1/3/4/5 as v2 and 2/5 separately to deal with this separately. Thanks, Michal --c1bb1RxfbBUH4KlR4U8NHXk2zSyOz97v0-- --ceNvNxLqJALj7W92fFJjb5zAE7giUZV30 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQQbPNTMvXmYlBPRwx7KSWXLKUoMIQUCXwwdUQAKCRDKSWXLKUoM IfDKAJ9H6tOa7oaSsaGMjeMMDYtkm3TiTQCgh3UYDyREkdgGQX/0uX2U3S6SgN8= =Olb8 -----END PGP SIGNATURE----- --ceNvNxLqJALj7W92fFJjb5zAE7giUZV30--