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Fri, 23 Oct 2020 10:26:52 -0700 (PDT) Received: from [10.230.182.181] ([192.19.224.250]) by smtp.gmail.com with ESMTPSA id ga19sm3147741pjb.3.2020.10.23.10.26.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Oct 2020 10:26:51 -0700 (PDT) Subject: Re: [PATCH v1 5/6] i2c: iproc: handle master read request To: Rayagonda Kokatanur , Dhananjay Phadke Cc: Andy Shevchenko , BCM Kernel Feedback , Brendan Higgins , Florian Fainelli , linux-arm Mailing List , linux-i2c , Linux Kernel Mailing List , Lori Hikichi , Ray Jui , Scott Branden , Wolfram Sang References: <20201011182254.17776-6-rayagonda.kokatanur@broadcom.com> <1602645639-12854-1-git-send-email-dphadke@linux.microsoft.com> From: Ray Jui Message-ID: <6c16052c-e427-90c1-8095-4135f35cc775@broadcom.com> Date: Fri, 23 Oct 2020 10:26:46 -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: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000ee493e05b259e2ca" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000ee493e05b259e2ca Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit On 10/13/2020 10:12 PM, Rayagonda Kokatanur wrote: > > > On Wed, Oct 14, 2020 at 8:50 AM Dhananjay Phadke > > wrote: > > On Sun, 11 Oct 2020 23:52:53 +0530, Rayagonda Kokatanur wrote: > > --- a/drivers/i2c/busses/i2c-bcm-iproc.c > > +++ b/drivers/i2c/busses/i2c-bcm-iproc.c > > > > -             } else if (status & BIT(IS_S_RD_EVENT_SHIFT)) { > > -                     /* Start of SMBUS for Master Read */ > > +                                     I2C_SLAVE_WRITE_REQUESTED, > &rx_data); > > +                     iproc_i2c->rx_start_rcvd = true; > > +                     iproc_i2c->slave_read_complete = false; > > +             } else if (rx_status == I2C_SLAVE_RX_DATA && > > +                        iproc_i2c->rx_start_rcvd) { > > +                     /* Middle of SMBUS Master write */ > >                       i2c_slave_event(iproc_i2c->slave, > > -                                     I2C_SLAVE_READ_REQUESTED, > &value); > > -                     iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value); > > +                                     I2C_SLAVE_WRITE_RECEIVED, > &rx_data); > > +             } else if (rx_status == I2C_SLAVE_RX_END && > > +                        iproc_i2c->rx_start_rcvd) { > > +                     /* End of SMBUS Master write */ > > +                     if (iproc_i2c->slave_rx_only) > > +                             i2c_slave_event(iproc_i2c->slave, > > +                                            >  I2C_SLAVE_WRITE_RECEIVED, > > +                                             &rx_data); > > + > > +                     i2c_slave_event(iproc_i2c->slave, > I2C_SLAVE_STOP, > > +                                     &rx_data); > > +             } else if (rx_status == I2C_SLAVE_RX_FIFO_EMPTY) { > > +                     iproc_i2c->rx_start_rcvd = false; > > +                     iproc_i2c->slave_read_complete = true; > > +                     break; > > +             } > >  > > -                     val = BIT(S_CMD_START_BUSY_SHIFT); > > -                     iproc_i2c_wr_reg(iproc_i2c, S_CMD_OFFSET, val); > > +             rx_bytes++; > > rx_bytes should be incremented only along with > I2C_SLAVE_WRITE_RECEIVED event? > > > It should be incremented in both I2C_SLAVE_WRITE_REQUESTED and   > I2C_SLAVE_WRITE_RECEIVED cases because in both case it is reading valid > bytes from rx fifo. > > > > > > +static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev > *iproc_i2c, > > +                                 u32 status) > > +{ > > +     u32 val; > > +     u8 value; > > + > > +     /* > > +      * Slave events in case of master-write, master-write-read and, > > +      * master-read > > +      * > > +      * Master-write     : only IS_S_RX_EVENT_SHIFT event > > +      * Master-write-read: both IS_S_RX_EVENT_SHIFT and > IS_S_RD_EVENT_SHIFT > > +      *                    events > > +      * Master-read      : both IS_S_RX_EVENT_SHIFT and > IS_S_RD_EVENT_SHIFT > > +      *                    events or only IS_S_RD_EVENT_SHIFT > > +      */ > > +     if (status & BIT(IS_S_RX_EVENT_SHIFT) || > > +         status & BIT(IS_S_RD_EVENT_SHIFT)) { > > +             /* disable slave interrupts */ > > +             val = iproc_i2c_rd_reg(iproc_i2c, IE_OFFSET); > > +             val &= ~iproc_i2c->slave_int_mask; > > +             iproc_i2c_wr_reg(iproc_i2c, IE_OFFSET, val); > > + > > +             if (status & BIT(IS_S_RD_EVENT_SHIFT)) > > +                     /* Master-write-read request */ > > +                     iproc_i2c->slave_rx_only = false; > > +             else > > +                     /* Master-write request only */ > > +                     iproc_i2c->slave_rx_only = true; > > + > > +             /* schedule tasklet to read data later */ > > +             tasklet_schedule(&iproc_i2c->slave_rx_tasklet); > > + > > +             /* clear only IS_S_RX_EVENT_SHIFT interrupt */ > > +             iproc_i2c_wr_reg(iproc_i2c, IS_OFFSET, > > +                              BIT(IS_S_RX_EVENT_SHIFT)); > > > > Both tasklet and isr are writing to status (IS_OFFSET) reg. > > > Yes this is required. > > For ex, If IS_S_RD_EVENT_SHIFT interrupt, this should be cleared once > the driver completes reading all data from rx fifo. > After this the driver can start sending data to master. >   If both tasklet and isr are accessing the IS_OFFSET register, don't you need lock protection against race condition? That is, ISR can interrupt tasklet. > > > The tasklet seems to be batching up rx fifo reads because of > time-sensitive > Master-write-read transaction? Linux I2C framework is byte interface > anyway. > Can the need to batch reads be avoided by setting slave rx threshold for > interrupt (S_FIFO_RX_THLD) to 1-byte? > > > To process more data with a single interrupt we are batching up rx fifo > reads. > This will reduce the number of interrupts. > > Also to avoid tasklet running more time (20us) we have a threshold of 10 > bytes for batching read. > This is a better/optimised approach than reading single byte data per > interrupt. > > > Also, wouldn't tasklets be susceptible to other interrupts? If fifo > reads > have to be batched up, can it be changed to threaded irq? > > > tasklets have higher priority than threaded irq, since i2c is time > sensitive so using a tasklet is preferred over threaded irq. >   --000000000000ee493e05b259e2ca 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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