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Thu, 2 Feb 2023 01:43:00 -0800 Envelope-to: git@amd.com, manikanta.guntupalli@amd.com, michal.simek@amd.com, shubhrajyoti.datta@amd.com, srinivas.goud@amd.com, manion05gk@gmail.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-arm-kernel@lists.infradead.org, andrew@lunn.ch, devicetree@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Received: from [172.23.64.3] (port=36996 helo=xhdvnc103.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1pNW7P-0003Nt-M3; Thu, 02 Feb 2023 01:43:00 -0800 Received: by xhdvnc103.xilinx.com (Postfix, from userid 90444) id 7158A1055BC; Thu, 2 Feb 2023 15:12:23 +0530 (IST) From: Manikanta Guntupalli To: , , , , , , , , CC: , , , , , Raviteja Narayanam Subject: [PATCH V4 3/9] i2c: xiic: Switch to Xiic standard mode for i2c-read Date: Thu, 2 Feb 2023 15:11:32 +0530 Message-ID: <1675330898-563-4-git-send-email-manikanta.guntupalli@amd.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1675330898-563-1-git-send-email-manikanta.guntupalli@amd.com> References: <1675330898-563-1-git-send-email-manikanta.guntupalli@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1NAM02FT045:EE_|MW4PR02MB7364:EE_ X-MS-Office365-Filtering-Correlation-Id: eafe6e2c-80ba-46dd-872c-08db0501e49d X-MS-Exchange-SenderADCheck: 0 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2023 09:43:09.0129 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eafe6e2c-80ba-46dd-872c-08db0501e49d X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: BN1NAM02FT045.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR02MB7364 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Raviteja Narayanam Xilinx I2C IP has two modes of operation, both of which implement I2C transactions. The only difference from sw perspective is the programming sequence for these modes. Dynamic mode -> Simple to program, less number of steps in sequence. Standard mode -> Gives flexibility, more number of steps in sequence. In dynamic mode, during the i2c-read transactions, if there is a delay(> 200us) between the register writes (address & byte count), read transaction fails. On a system with load, this scenario is occurring frequently. To avoid this, switch to standard mode if there is a read request. Added a quirk to identify the IP version effected by this and follow the standard mode. Signed-off-by: Raviteja Narayanam Signed-off-by: Manikanta Guntupalli Acked-by: Michal Simek --- drivers/i2c/busses/i2c-xiic.c | 96 +++++++++++++++++++++-------------- 1 file changed, 57 insertions(+), 39 deletions(-) diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c index 86da622e060c..edc64b79e293 100644 --- a/drivers/i2c/busses/i2c-xiic.c +++ b/drivers/i2c/busses/i2c-xiic.c @@ -32,6 +32,7 @@ #include #define DRIVER_NAME "xiic-i2c" +#define DYNAMIC_MODE_READ_BROKEN_BIT BIT(0) enum xilinx_i2c_state { STATE_DONE, @@ -62,6 +63,7 @@ enum xiic_endian { * @singlemaster: Indicates bus is single master * @dynamic: Mode of controller * @prev_msg_tx: Previous message is Tx + * @quirks: To hold platform specific bug info */ struct xiic_i2c { struct device *dev; @@ -80,6 +82,11 @@ struct xiic_i2c { bool singlemaster; bool dynamic; bool prev_msg_tx; + u32 quirks; +}; + +struct xiic_version_data { + u32 quirks; }; #define XIIC_MSB_OFFSET 0 @@ -878,7 +885,8 @@ static void __xiic_start_xfer(struct xiic_i2c *i2c) static int xiic_start_xfer(struct xiic_i2c *i2c, struct i2c_msg *msgs, int num) { - int ret; + bool broken_read, max_read_len, smbus_blk_read; + int ret, count; mutex_lock(&i2c->lock); @@ -891,6 +899,34 @@ static int xiic_start_xfer(struct xiic_i2c *i2c, struct i2c_msg *msgs, int num) i2c->nmsgs = num; init_completion(&i2c->completion); + /* Decide standard mode or Dynamic mode */ + i2c->dynamic = true; + + /* Initialize prev message type */ + i2c->prev_msg_tx = false; + + /* + * Scan through nmsgs, use dynamic mode when none of the below three + * conditions occur. We need standard mode even if one condition holds + * true in the entire array of messages in a single transfer. + * If read transaction as dynamic mode is broken for delayed reads + * in xlnx,axi-iic-2.0 / xlnx,xps-iic-2.00.a IP versions. + * If read length is > 255 bytes. + * If smbus_block_read transaction. + */ + for (count = 0; count < i2c->nmsgs; count++) { + broken_read = (i2c->quirks & DYNAMIC_MODE_READ_BROKEN_BIT) && + (i2c->tx_msg[count].flags & I2C_M_RD); + max_read_len = (i2c->tx_msg[count].flags & I2C_M_RD) && + (i2c->tx_msg[count].len > MAX_READ_LENGTH_DYNAMIC); + smbus_blk_read = (i2c->tx_msg[count].flags & I2C_M_RECV_LEN); + + if (broken_read || max_read_len || smbus_blk_read) { + i2c->dynamic = false; + break; + } + } + ret = xiic_reinit(i2c); if (!ret) __xiic_start_xfer(i2c); @@ -913,36 +949,6 @@ static int xiic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) if (err < 0) return err; - /* Decide standard mode or Dynamic mode */ - i2c->dynamic = true; - - /* Initialize prev message type */ - i2c->prev_msg_tx = false; - - /* - * If number of messages is 1 and read length is > 255 bytes, - * enter standard mode - */ - - if (i2c->nmsgs == 1 && (i2c->tx_msg->flags & I2C_M_RD) && - i2c->tx_msg->len > MAX_READ_LENGTH_DYNAMIC) { - i2c->dynamic = false; - } else if (i2c->nmsgs > 1) { - int count; - - /* - * If number of messages is more than 1 and one of them is - * a read message, enter standard mode. Since repeated start - * operation in dynamic mode read is not happenning - */ - for (count = 0; count < i2c->nmsgs; count++) { - if (i2c->tx_msg[count].flags & I2C_M_RD) { - i2c->dynamic = false; - break; - } - } - } - err = xiic_start_xfer(i2c, msgs, num); if (err < 0) { dev_err(adap->dev.parent, "Error xiic_start_xfer\n"); @@ -985,10 +991,23 @@ static const struct i2c_adapter xiic_adapter = { .algo = &xiic_algorithm, }; +static const struct xiic_version_data xiic_2_00 = { + .quirks = DYNAMIC_MODE_READ_BROKEN_BIT, +}; + +#if defined(CONFIG_OF) +static const struct of_device_id xiic_of_match[] = { + { .compatible = "xlnx,xps-iic-2.00.a", .data = &xiic_2_00 }, + {}, +}; +MODULE_DEVICE_TABLE(of, xiic_of_match); +#endif + static int xiic_i2c_probe(struct platform_device *pdev) { struct xiic_i2c *i2c; struct xiic_i2c_platform_data *pdata; + const struct of_device_id *match; struct resource *res; int ret, irq; u8 i; @@ -998,6 +1017,13 @@ static int xiic_i2c_probe(struct platform_device *pdev) if (!i2c) return -ENOMEM; + match = of_match_node(xiic_of_match, pdev->dev.of_node); + if (match && match->data) { + const struct xiic_version_data *data = match->data; + + i2c->quirks = data->quirks; + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); i2c->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(i2c->base)) @@ -1112,14 +1138,6 @@ static int xiic_i2c_remove(struct platform_device *pdev) return 0; } -#if defined(CONFIG_OF) -static const struct of_device_id xiic_of_match[] = { - { .compatible = "xlnx,xps-iic-2.00.a", }, - {}, -}; -MODULE_DEVICE_TABLE(of, xiic_of_match); -#endif - static int __maybe_unused xiic_i2c_runtime_suspend(struct device *dev) { struct xiic_i2c *i2c = dev_get_drvdata(dev); -- 2.25.1