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Mon, 9 Aug 2021 06:36:16 +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, linux-imx@nxp.com Subject: [PATCH V4 4/8] i3c: master: svc: add support for slave to stop returning data Date: Mon, 9 Aug 2021 14:36:41 +0800 Message-Id: <20210809063645.2289988-5-xiaoning.wang@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210809063645.2289988-1-xiaoning.wang@nxp.com> References: <20210809063645.2289988-1-xiaoning.wang@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SG2PR02CA0103.apcprd02.prod.outlook.com (2603:1096:4:92::19) 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 SG2PR02CA0103.apcprd02.prod.outlook.com (2603:1096:4:92::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.16 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 Reviewed-by: Jun Li --- V4 changes: - Only use COMPLETE flag in the read function. - Add a reset before each transfer. V2/V3: No change. --- drivers/i3c/master/svc-i3c-master.c | 56 ++++++++++++++++++++--------- 1 file changed, 39 insertions(+), 17 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 4e69c691253d..e767f307db2d 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -896,27 +896,35 @@ static int svc_i3c_master_do_daa(struct i3c_master_controller *m) static int svc_i3c_master_read(struct svc_i3c_master *master, u8 *in, unsigned int len) { - int offset = 0, i, ret; - u32 mdctrl; + int offset = 0, i; + u32 mdctrl, mstatus; + bool completed = false; + unsigned int count; + unsigned long start = jiffies; - while (offset < len) { - unsigned int count; + while (!completed) { + mstatus = readl(master->regs + SVC_I3C_MSTATUS); + if (SVC_I3C_MSTATUS_COMPLETE(mstatus) != 0) + completed = true; - ret = readl_poll_timeout(master->regs + SVC_I3C_MDATACTRL, - mdctrl, - !(mdctrl & SVC_I3C_MDATACTRL_RXEMPTY), - 0, 1000); - if (ret) - return ret; + if (time_after(jiffies, start + msecs_to_jiffies(1000))) { + dev_dbg(master->dev, "<%s> timeout\n", __func__); + return -ETIMEDOUT; + } + mdctrl = readl(master->regs + SVC_I3C_MDATACTRL); count = SVC_I3C_MDATACTRL_RXCOUNT(mdctrl); + if (offset + count > len) { + dev_err(master->dev, "<%s> recv len too long!\n", + __func__); + return -EINVAL; + } for (i = 0; i < count; i++) in[offset + i] = readl(master->regs + SVC_I3C_MRDATAB); - offset += count; } - return 0; + return offset; } static int svc_i3c_master_write(struct svc_i3c_master *master, @@ -949,7 +957,7 @@ 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; @@ -959,7 +967,7 @@ 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, @@ -971,17 +979,25 @@ 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); if (ret) goto emit_stop; + writel(SVC_I3C_MINT_COMPLETE, master->regs + SVC_I3C_MSTATUS); - if (!continued) + if (!continued) { svc_i3c_master_emit_stop(master); + /* Wait idle if stop is sent. */ + readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, + !SVC_I3C_MSTATUS_STATE(reg), 0, 1000); + } + return 0; emit_stop: @@ -1039,12 +1055,15 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master) if (!xfer) return; + svc_i3c_master_clear_merrwarn(master); + svc_i3c_master_flush_fifo(master); + for (i = 0; i < xfer->ncmds; i++) { struct svc_i3c_cmd *cmd = &xfer->cmds[i]; 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; @@ -1173,6 +1192,9 @@ 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