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a=openpgp-sha256; l=4449; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=42Enl7rJ+JieEa2j+TC+Pkbg3DYxAPRfCHYi64Mdal8=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBmdLNZW1iosGP2/ESy5WgAGVEoe8PqaPXapLjv8 Z5ef9DvoauJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZnSzWQAKCRCLPIo+Aiko 1ccECACV/t1O7ibAb++EUfbXBQHS1BVPzE5BfW10D8XOLBh4Y71iTfBan0XZMR56o+hvJy1B9Un TOtp0zCUfQMQKPEUE79oVfhEP9Mm+fBKLvLx4uIyvOsEA0FpLA9kwFLUC086n/8zEsa0Llcvjib wFwaHncYK92DaNRJaJ6dDPUHV0jk3rdY5b2rcGbymUfniut3PZJZ0azC5ckc5SjbVI7dqS8q9N9 dv/mNa8u9muxna9inYtyRMJrFPiAioRycDC7vtAOpkz/c5AHvWPFSzHJjilKSi28Lwyk1WQ5BJX rJ+TYTACbKFBmMVjJ8A655Zjq34XmFx+wIewFisYIdqB3AdQ X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240620_155528_162839_A70B8C28 X-CRM114-Status: GOOD ( 14.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Rework command execution code to remove recursive calls of ucsi_exec_command. This also streamlines the sync_control / read(CCI) read (MESSAGE_IN) sequence, allowing further rework of the command code. Signed-off-by: Dmitry Baryshkov --- drivers/usb/typec/ucsi/ucsi.c | 134 ++++++++++++++++++++---------------------- 1 file changed, 64 insertions(+), 70 deletions(-) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 81b459b26b74..58d9602bd752 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -63,25 +63,74 @@ static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_ack) return ucsi->ops->sync_control(ucsi, ctrl); } -static int ucsi_exec_command(struct ucsi *ucsi, u64 command); - -static int ucsi_read_error(struct ucsi *ucsi) +static int ucsi_run_command(struct ucsi *ucsi, u64 command, u32 *cci, + void *data, size_t size, bool conn_ack) { - u16 error; int ret; - ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS); - if (ret < 0) + *cci = 0; + + ret = ucsi->ops->sync_control(ucsi, command); + if (ret) return ret; - ret = ucsi_read_message_in(ucsi, &error, sizeof(error)); + ret = ucsi->ops->read_cci(ucsi, cci); if (ret) return ret; - ret = ucsi_acknowledge(ucsi, false); + if (*cci & UCSI_CCI_BUSY) + return -EBUSY; + + if (!(*cci & UCSI_CCI_COMMAND_COMPLETE)) + return -EIO; + + if (*cci & UCSI_CCI_NOT_SUPPORTED) { + if (ucsi_acknowledge(ucsi, false) < 0) + dev_err(ucsi->dev, + "ACK of unsupported command failed\n"); + return -EOPNOTSUPP; + } + + if (*cci & UCSI_CCI_ERROR) { + /* Acknowledge the command that failed */ + ret = ucsi_acknowledge(ucsi, false); + return ret ? ret : -EIO; + } + + if (data) { + ret = ucsi_read_message_in(ucsi, data, size); + if (ret) + return ret; + } + + ret = ucsi_acknowledge(ucsi, conn_ack); if (ret) return ret; + return 0; +} + +static int ucsi_read_error(struct ucsi *ucsi) +{ + u16 error; + u32 cci; + int ret; + + ret = ucsi_run_command(ucsi, UCSI_GET_ERROR_STATUS, &cci, + &error, sizeof(error), false); + + if (cci & UCSI_CCI_BUSY) { + ret = ucsi_run_command(ucsi, UCSI_CANCEL, &cci, NULL, 0, false); + + return ret ? ret : -EBUSY; + } + + if (ret < 0) + return ret; + + if (cci & UCSI_CCI_ERROR) + return -EIO; + switch (error) { case UCSI_ERROR_INCOMPATIBLE_PARTNER: return -EOPNOTSUPP; @@ -121,78 +170,23 @@ static int ucsi_read_error(struct ucsi *ucsi) return -EIO; } -static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd) -{ - u32 cci; - int ret; - - ret = ucsi->ops->sync_control(ucsi, cmd); - if (ret) - return ret; - - ret = ucsi->ops->read_cci(ucsi, &cci); - if (ret) - return ret; - - if (cmd != UCSI_CANCEL && cci & UCSI_CCI_BUSY) - return ucsi_exec_command(ucsi, UCSI_CANCEL); - - if (!(cci & UCSI_CCI_COMMAND_COMPLETE)) - return -EIO; - - if (cci & UCSI_CCI_NOT_SUPPORTED) { - if (ucsi_acknowledge(ucsi, false) < 0) - dev_err(ucsi->dev, - "ACK of unsupported command failed\n"); - return -EOPNOTSUPP; - } - - if (cci & UCSI_CCI_ERROR) { - /* Acknowledge the command that failed */ - ret = ucsi_acknowledge(ucsi, false); - if (ret) - return ret; - - if (cmd == UCSI_GET_ERROR_STATUS) - return -EIO; - - return ucsi_read_error(ucsi); - } - - if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) { - ret = ucsi_acknowledge(ucsi, false); - return ret ? ret : -EBUSY; - } - - return UCSI_CCI_LENGTH(cci); -} - static int ucsi_send_command_common(struct ucsi *ucsi, u64 command, void *data, size_t size, bool conn_ack) { - u8 length; + u32 cci; int ret; mutex_lock(&ucsi->ppm_lock); - ret = ucsi_exec_command(ucsi, command); - if (ret < 0) - goto out; - - length = ret; - - if (data) { - ret = ucsi_read_message_in(ucsi, data, size); - if (ret) - goto out; + ret = ucsi_run_command(ucsi, command, &cci, data, size, conn_ack); + if (cci & UCSI_CCI_BUSY) { + ret = ucsi_run_command(ucsi, UCSI_CANCEL, &cci, NULL, 0, false); + return ret ? ret : -EBUSY; } - ret = ucsi_acknowledge(ucsi, conn_ack); - if (ret) - goto out; + if (cci & UCSI_CCI_ERROR) + return ucsi_read_error(ucsi); - ret = length; -out: mutex_unlock(&ucsi->ppm_lock); return ret; }