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Fri, 16 Jul 2021 07:36:19 +0000 From: Clark Wang To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, xiaoning.wang@nxp.com Subject: [PATCH V2 3/5] i3c: master: svc: add support for slave to stop returning data Date: Fri, 16 Jul 2021 15:37:21 +0800 Message-Id: <20210716073723.3490180-4-xiaoning.wang@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210716073723.3490180-1-xiaoning.wang@nxp.com> References: <20210716073723.3490180-1-xiaoning.wang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SG2PR02CA0005.apcprd02.prod.outlook.com (2603:1096:3:17::17) To AM6PR04MB5623.eurprd04.prod.outlook.com (2603:10a6:20b:a9::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (119.31.174.71) by SG2PR02CA0005.apcprd02.prod.outlook.com (2603:1096:3:17::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21 via Frontend Transport; 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Add this support for svc i3c controller. Otherwise, it will go TIMEOUT error path when the slave device ends the read operation early. Signed-off-by: Clark Wang --- V2: No change. --- drivers/i3c/master/svc-i3c-master.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 47c02a60cf62..91358cc5ca07 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -869,7 +869,7 @@ static int svc_i3c_master_read(struct svc_i3c_master *master, u8 *in, unsigned int len) { int offset = 0, i, ret; - u32 mdctrl; + u32 mdctrl, mstatus; while (offset < len) { unsigned int count; @@ -878,8 +878,15 @@ static int svc_i3c_master_read(struct svc_i3c_master *master, mdctrl, !(mdctrl & SVC_I3C_MDATACTRL_RXEMPTY), 0, 1000); - if (ret) - return ret; + if (ret) { + ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, + mstatus, SVC_I3C_MSTATUS_COMPLETE(mstatus), + 0, 1000); + if (ret) + return ret; + else + return offset; + } count = SVC_I3C_MDATACTRL_RXCOUNT(mdctrl); for (i = 0; i < count; i++) @@ -888,7 +895,7 @@ static int svc_i3c_master_read(struct svc_i3c_master *master, offset += count; } - return 0; + return offset; } static int svc_i3c_master_write(struct svc_i3c_master *master, @@ -921,7 +928,7 @@ static int svc_i3c_master_write(struct svc_i3c_master *master, static int svc_i3c_master_xfer(struct svc_i3c_master *master, bool rnw, unsigned int xfer_type, u8 addr, u8 *in, const u8 *out, unsigned int xfer_len, - unsigned int read_len, bool continued) + unsigned int *read_len, bool continued) { u32 reg; int ret; @@ -931,7 +938,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master, SVC_I3C_MCTRL_IBIRESP_NACK | SVC_I3C_MCTRL_DIR(rnw) | SVC_I3C_MCTRL_ADDR(addr) | - SVC_I3C_MCTRL_RDTERM(read_len), + SVC_I3C_MCTRL_RDTERM(*read_len), master->regs + SVC_I3C_MCTRL); ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, @@ -943,8 +950,10 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master, ret = svc_i3c_master_read(master, in, xfer_len); else ret = svc_i3c_master_write(master, out, xfer_len); - if (ret) + if (ret < 0) goto emit_stop; + if (rnw) + *read_len = ret; ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000); @@ -1016,7 +1025,7 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master) ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type, cmd->addr, cmd->in, cmd->out, - cmd->len, cmd->read_len, + cmd->len, &cmd->read_len, cmd->continued); if (ret) break; @@ -1145,6 +1154,9 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master, if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000))) svc_i3c_master_dequeue_xfer(master, xfer); + if (cmd->read_len != xfer_len) + ccc->dests[0].payload.len = cmd->read_len; + ret = xfer->ret; svc_i3c_master_free_xfer(xfer); -- 2.25.1