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Mon, 26 Oct 2020 17:36:10 -0700 (PDT) Subject: Re: [PATCH v1 6/6] i2c: iproc: handle rx fifo full interrupt To: Rayagonda Kokatanur , Dhananjay Phadke References: <20201011182254.17776-7-rayagonda.kokatanur@broadcom.com> From: Ray Jui Message-ID: <94f8211d-1273-4c68-31e9-2f35f364e6c8@broadcom.com> Date: Mon, 26 Oct 2020 17:36:04 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201026_203614_921619_2BC81B26 X-CRM114-Status: GOOD ( 17.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lori Hikichi , Florian Fainelli , Scott Branden , Ray Jui , Brendan Higgins , Linux Kernel Mailing List , Wolfram Sang , BCM Kernel Feedback , linux-i2c , Andy Shevchenko , linux-arm Mailing List Content-Type: multipart/mixed; boundary="===============5098927976822058030==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5098927976822058030== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000d0a93005b29c3b35" --000000000000d0a93005b29c3b35 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 10/26/2020 8:13 AM, Rayagonda Kokatanur wrote: > Hi Dhanajay, > > On Fri, Oct 23, 2020 at 11:12 PM Ray Jui wrote: >> >> >> >> On 10/12/2020 3:03 PM, Dhananjay Phadke wrote: >>> From: Rayagonda Kokatanur >>> >>> On Sun, 11 Oct 2020 23:52:54 +0530, Rayagonda Kokatanur wrote: >>>> Add code to handle IS_S_RX_FIFO_FULL_SHIFT interrupt to support >>>> master write request with >= 64 bytes. >>>> >>>> Iproc has a slave rx fifo size of 64 bytes. >>>> Rx fifo full interrupt (IS_S_RX_FIFO_FULL_SHIFT) will be generated >>>> when RX fifo becomes full. This can happen if master issues write >>>> request of more than 64 bytes. >>>> >>> >>> ARM cores run much faster than I2C bus, why would rx fifo go full when >>> rx interrupt is enabled and bytes are read out by bus driver isr? >>> Isn't fifo read pointer updated on these byte reads? >> >> Hi Rayagonda, >> >> Could you please reply on this question? For transactions > 64 bytes, do >> we batch until RX FIFO is full before we read out the data? > > Sorry I missed this question. > Yes with current design we are batching 64 bytes for translation > 64 bytes. > So we do batch the transfer and read them in one shot, and that's how the FIFO full interrupt is being utilized for. That sounds okay to me. Thanks, Ray > Best regards, > Rayagonda > > >> >> Thanks, >> >> Ray >> >>> Does controller stretch clock when rx fifo is full (e.g. kernel has >>> crashed, bus driver isn't draining fifo)? >>> --000000000000d0a93005b29c3b35 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQMwYJKoZIhvcNAQcCoIIQJDCCECACAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2IMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA tpZok2X9LAHsYqMNVL+Ly6RDkaKar7GD8rVtb9nw6tzPFnvXGeOEA4X5xh9wjx9sScVpGR5wkTg1 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