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Mon, 26 Feb 2024 16:53:46 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, andi.shyti@kernel.org, eajames@linux.ibm.com, alistair@popple.id.au, joel@jms.id.au, jk@ozlabs.org, robh@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, lakshmiy@us.ibmcom Subject: [PATCH v2 30/31] i2c: fsi: Add boolean for skip stop command on abort Date: Mon, 26 Feb 2024 10:53:20 -0600 Message-Id: <20240226165321.91976-31-eajames@linux.ibm.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240226165321.91976-1-eajames@linux.ibm.com> References: <20240226165321.91976-1-eajames@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: XYAcP_qZUe-CGT6_iSEUR-llXo9h3YtH X-Proofpoint-ORIG-GUID: XYAcP_qZUe-CGT6_iSEUR-llXo9h3YtH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-26_11,2024-02-26_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 suspectscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402260128 Content-Type: text/plain; charset="utf-8" In preparation for interrupt support, store whether to skip the final stop command during the abort procedure instead of checking the previously read status register in the abort function. Signed-off-by: Eddie James --- drivers/i2c/busses/i2c-fsi.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 5f524fb6f0f8..33f4e64cb60b 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -116,6 +116,9 @@ #define I2C_STAT_ANY_RESP (I2C_STAT_ERR | \ I2C_STAT_DAT_REQ | \ I2C_STAT_CMD_COMP) +#define I2C_STAT_SKIP_STOP (I2C_STAT_PARITY | \ + I2C_STAT_LOST_ARB | \ + I2C_STAT_STOP_ERR) =20 /* extended status register */ #define I2C_ESTAT_FIFO_SZ GENMASK(31, 24) @@ -150,6 +153,7 @@ struct fsi_i2c_master { struct mutex lock; u32 clock_div; u8 fifo_size; + bool skip_stop; }; =20 struct fsi_i2c_port { @@ -459,31 +463,30 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master= *i2c, u16 port) return 0; } =20 -static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status) +static int fsi_i2c_abort(struct fsi_i2c_port *port) { struct fsi_i2c_master *i2c =3D port->master; u32 cmd =3D I2C_CMD_WITH_STOP; unsigned long start; - u32 stat; + u32 status; int rc; =20 rc =3D fsi_i2c_reset_engine(i2c, port->port); if (rc) return rc; =20 - rc =3D fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat); + rc =3D fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status); if (rc) return rc; =20 /* if sda is low, peform full bus reset */ - if (!(stat & I2C_STAT_SDA_IN)) { + if (!(status & I2C_STAT_SDA_IN)) { rc =3D fsi_i2c_reset_bus(i2c, port); if (rc) return rc; } =20 - /* skip final stop command for these errors */ - if (status & (I2C_STAT_PARITY | I2C_STAT_LOST_ARB | I2C_STAT_STOP_ERR)) + if (i2c->skip_stop) return 0; =20 /* write stop command */ @@ -534,7 +537,8 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *p= ort, int rc; =20 if (status & I2C_STAT_ERR) { - rc =3D fsi_i2c_abort(port, status); + port->master->skip_stop =3D status & I2C_STAT_SKIP_STOP; + rc =3D fsi_i2c_abort(port); if (rc) return rc; =20 --=20 2.39.3