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Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190911095854.5141-1-codrin.ciubotariu@microchip.com> Content-Language: en-US Content-ID: <65345012C46F634D92545244C8ACDE72@namprd11.prod.outlook.com> Sender: linux-kernel-owner@vger.kernel.org To: Codrin.Ciubotariu@microchip.com, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Ludovic.Desroches@microchip.com, alexandre.belloni@bootlin.com, wsa@the-dreams.de List-Id: linux-i2c@vger.kernel.org DQoNCk9uIDExLjA5LjIwMTkgMTI6NTgsIENvZHJpbiBDaXVib3Rhcml1IHdyb3RlOg0KPiBFeHRl cm5hbCBFLU1haWwNCj4gDQo+IA0KPiBBZnRlciBhIHRyYW5zZmVyIHRpbWVvdXQsIHNvbWUgZmF1 bHR5IEkyQyBzbGF2ZSBkZXZpY2VzIG1pZ2h0IGhvbGQgZG93bg0KPiB0aGUgU0NMIG9yIHRoZSBT REEgcGlucy4gV2UgY2FuIGdlbmVyYXRlIGEgYnVzIGNsZWFyIGNvbW1hbmQsIGhvcGluZyB0aGF0 DQo+IHRoZSBzbGF2ZSBtaWdodCByZWxlYXNlIHRoZSBwaW5zLg0KPiANCj4gU2lnbmVkLW9mZi1i eTogQ29kcmluIENpdWJvdGFyaXUgPGNvZHJpbi5jaXVib3Rhcml1QG1pY3JvY2hpcC5jb20+DQoN 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jdVASLg54L0QTHx6oPq7sjnoj5IQAz3Y1ihj86fYIMeQE6xYnz/+vK2SY+pZhUc//E+qbzyxr/R1DLvGkNbRDSbS7GCMFNK2KAt1eJgCep6fdQ9tpRjweSAJVcfLpBI5YhHIi5+HqyhJ+zuy+rWzrmdgoHn1hSMTFGx5P6uBK6Ld6HPdJ7xbk+ffPbjKnylwD4T69qJM0z53a7N1nyTpBJ1b8vX4Yk4+zGYRLXb+YwldWpe0TYinj4Pp+vZiKlAdT9nCH2jkRRb2SIkz7GH911DgVTfsF7g6GiGvmnmeTKU7fHIINxwQj4zWyFtVKX2t5CE8VB8J/8GjJkXXhBppOmg0S9Sq02QoRt32z5/HnzHFKehcS0r1WEYxXPWW7QIhogBH6SKvtz1tpKUmkS+G6T8DiCqtmzUd9clDT/bWQ+8= Content-ID: <65345012C46F634D92545244C8ACDE72@namprd11.prod.outlook.com> MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 5b25927b-b4ec-43ad-7c43-08d73a658b56 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Sep 2019 05:20:10.6490 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: zV3Uig03meuY3JLX7sljp7w1Wwx8OD8+xuqUGGzKP2fXfV90dXYH+2GjaSjUPTnNWtIaSnUCmrA/FJVu0QyeBtOztTFnAAppEYR9ueDG7xc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1342 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190915_222016_801422_42298389 X-CRM114-Status: GOOD ( 14.94 ) 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: Ludovic.Desroches@microchip.com, alexandre.belloni@bootlin.com, wsa@the-dreams.de Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11.09.2019 12:58, Codrin Ciubotariu wrote: > External E-Mail > > > After a transfer timeout, some faulty I2C slave devices might hold down > the SCL or the SDA pins. We can generate a bus clear command, hoping that > the slave might release the pins. > > Signed-off-by: Codrin Ciubotariu Reviewed-by: Claudiu Beznea > --- > drivers/i2c/busses/i2c-at91-master.c | 20 ++++++++++++++++++++ > drivers/i2c/busses/i2c-at91.h | 6 +++++- > 2 files changed, 25 insertions(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c > index a3fcc35ffd3b..5f544a16db96 100644 > --- a/drivers/i2c/busses/i2c-at91-master.c > +++ b/drivers/i2c/busses/i2c-at91-master.c > @@ -599,6 +599,26 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev) > at91_twi_write(dev, AT91_TWI_CR, > AT91_TWI_THRCLR | AT91_TWI_LOCKCLR); > } > + > + /* > + * After timeout, some faulty I2C slave devices might hold SCL/SDA down; > + * we can send a bus clear command, hoping that the pins will be > + * released > + */ > + if (!(dev->transfer_status & AT91_TWI_SDA) || > + !(dev->transfer_status & AT91_TWI_SCL)) { > + dev_dbg(dev->dev, > + "SDA/SCL are down; sending bus clear command\n"); > + if (dev->use_alt_cmd) { > + unsigned int acr; > + > + acr = at91_twi_read(dev, AT91_TWI_ACR); > + acr &= ~AT91_TWI_ACR_DATAL_MASK; > + at91_twi_write(dev, AT91_TWI_ACR, acr); > + } > + at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_CLEAR); > + } > + > return ret; > } > > diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h > index 499b506f6128..ffb870f3ffc6 100644 > --- a/drivers/i2c/busses/i2c-at91.h > +++ b/drivers/i2c/busses/i2c-at91.h > @@ -36,6 +36,7 @@ > #define AT91_TWI_SVDIS BIT(5) /* Slave Transfer Disable */ > #define AT91_TWI_QUICK BIT(6) /* SMBus quick command */ > #define AT91_TWI_SWRST BIT(7) /* Software Reset */ > +#define AT91_TWI_CLEAR BIT(15) /* Bus clear command */ > #define AT91_TWI_ACMEN BIT(16) /* Alternative Command Mode Enable */ > #define AT91_TWI_ACMDIS BIT(17) /* Alternative Command Mode Disable */ > #define AT91_TWI_THRCLR BIT(24) /* Transmit Holding Register Clear */ > @@ -69,6 +70,8 @@ > #define AT91_TWI_NACK BIT(8) /* Not Acknowledged */ > #define AT91_TWI_EOSACC BIT(11) /* End Of Slave Access */ > #define AT91_TWI_LOCK BIT(23) /* TWI Lock due to Frame Errors */ > +#define AT91_TWI_SCL BIT(24) /* TWI SCL status */ > +#define AT91_TWI_SDA BIT(25) /* TWI SDA status */ > > #define AT91_TWI_INT_MASK \ > (AT91_TWI_TXCOMP | AT91_TWI_RXRDY | AT91_TWI_TXRDY | AT91_TWI_NACK \ > @@ -81,7 +84,8 @@ > #define AT91_TWI_THR 0x0034 /* Transmit Holding Register */ > > #define AT91_TWI_ACR 0x0040 /* Alternative Command Register */ > -#define AT91_TWI_ACR_DATAL(len) ((len) & 0xff) > +#define AT91_TWI_ACR_DATAL_MASK GENMASK(15, 0) > +#define AT91_TWI_ACR_DATAL(len) ((len) & AT91_TWI_ACR_DATAL_MASK) > #define AT91_TWI_ACR_DIR BIT(8) > > #define AT91_TWI_FMR 0x0050 /* FIFO Mode Register */ > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel