linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Clark Wang <xiaoning.wang@nxp.com>
To: aisheng.dong@nxp.com, robh+dt@kernel.org, shawnguo@kernel.org,
	s.hauer@pengutronix.de, festevam@gmail.com
Cc: kernel@pengutronix.de, linux-imx@nxp.com,
	linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH V2 18/18] i2c: imx-lpi2c: fix pio mode cannot send 256+ bytes in one frame
Date: Tue,  6 Apr 2021 19:33:06 +0800	[thread overview]
Message-ID: <20210406113306.2633595-19-xiaoning.wang@nxp.com> (raw)
In-Reply-To: <20210406113306.2633595-1-xiaoning.wang@nxp.com>

The next MTDR command should be filled before the last receive command is
fininshed. Otherwise, a NACK will be sent when the current MTDR command
is finished. It causes lpi2c cannot send the next chunk data
successfully.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
---
V2 changes:
 - New patch added in V2
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 43 +++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 3c0f16a79185..8d908b9b5112 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -112,6 +112,7 @@ struct lpi2c_imx_struct {
 	struct completion	complete;
 	unsigned int		msglen;
 	unsigned int		delivered;
+	unsigned int		remain_chunk_num;
 	unsigned int		block_data;
 	unsigned int		bitrate;
 	unsigned int		txfifosize;
@@ -413,6 +414,28 @@ static void lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx)
 		complete(&lpi2c_imx->complete);
 }
 
+static void lpi2c_imx_pio_push_rx_cmd(struct lpi2c_imx_struct *lpi2c_imx)
+{
+	unsigned int remaining, temp;
+	u8 last_chunk_num = lpi2c_imx->msglen % CHUNK_DATA;
+
+	if (lpi2c_imx->remain_chunk_num > 0 &&
+		(lpi2c_imx->delivered % CHUNK_DATA) > (CHUNK_DATA >> 1)) {
+		if ((readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff) <=
+						(lpi2c_imx->rxfifosize >> 1)) {
+			if (last_chunk_num)
+				remaining = (lpi2c_imx->remain_chunk_num - 1) *
+					    CHUNK_DATA + last_chunk_num;
+			else
+				remaining = lpi2c_imx->remain_chunk_num * CHUNK_DATA;
+			temp = (remaining > CHUNK_DATA ? CHUNK_DATA : remaining) - 1;
+			temp |= (RECV_DATA << 8);
+			writel(temp, lpi2c_imx->base + LPI2C_MTDR);
+			lpi2c_imx->remain_chunk_num--;
+		}
+	}
+}
+
 static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
 {
 	unsigned int blocklen, remaining;
@@ -420,10 +443,16 @@ static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
 
 	do {
 		data = readl(lpi2c_imx->base + LPI2C_MRDR);
-		if (data & MRDR_RXEMPTY)
-			break;
+		if (data & MRDR_RXEMPTY) {
+			if (lpi2c_imx->delivered == lpi2c_imx->msglen ||
+			    lpi2c_imx->block_data)
+				break;
+			else
+				continue;
+		}
 
 		lpi2c_imx->rx_buf[lpi2c_imx->delivered++] = data & 0xff;
+		lpi2c_imx_pio_push_rx_cmd(lpi2c_imx);
 	} while (1);
 
 	/*
@@ -451,13 +480,9 @@ static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
 		temp = remaining;
 		temp |= (RECV_DATA << 8);
 		writel(temp, lpi2c_imx->base + LPI2C_MTDR);
-	} else if (!(lpi2c_imx->delivered & 0xff)) {
-		temp = (remaining > CHUNK_DATA ? CHUNK_DATA : remaining) - 1;
-		temp |= (RECV_DATA << 8);
-		writel(temp, lpi2c_imx->base + LPI2C_MTDR);
 	}
 
-	lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE);
+	lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE | MIER_NDIE);
 }
 
 static void lpi2c_imx_write(struct lpi2c_imx_struct *lpi2c_imx,
@@ -477,6 +502,10 @@ static void lpi2c_imx_read(struct lpi2c_imx_struct *lpi2c_imx,
 	lpi2c_imx->block_data = msgs->flags & I2C_M_RECV_LEN;
 
 	lpi2c_imx_set_rx_watermark(lpi2c_imx);
+	if (msgs->len > CHUNK_DATA) {
+		temp = CHUNK_DATA - 1;
+		lpi2c_imx->remain_chunk_num = DIV_ROUND_UP(msgs->len, CHUNK_DATA) - 1;
+	}
 	temp = msgs->len > CHUNK_DATA ? CHUNK_DATA - 1 : msgs->len - 1;
 	temp |= (RECV_DATA << 8);
 	writel(temp, lpi2c_imx->base + LPI2C_MTDR);
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

      parent reply	other threads:[~2021-04-06 11:46 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06 11:32 [PATCH V2 00/18] i2c: imx-lpi2c: New features and bug fixes Clark Wang
2021-04-06 11:32 ` [PATCH V2 01/18] i2c: imx-lpi2c: directly retrun ISR when detect a NACK Clark Wang
2021-04-06 11:32 ` [PATCH V2 02/18] i2c: imx-lpi2c: add ipg clk for lpi2c driver Clark Wang
2021-05-21  6:14   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 03/18] ARM: dts: imx7ulp: add the missing lpi2c ipg clock Clark Wang
2021-05-21  6:17   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 04/18] ARM: dts: imx7ulp: add the missing lpi2c nodes Clark Wang
2021-05-21  6:25   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 05/18] ARM64: dts: imx8: add the missing lpi2c ipg clock Clark Wang
2021-05-11  2:59   ` Shawn Guo
2021-05-21  6:28   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 06/18] ARM64: dts: imx8: change i2c irq number to non-combined Clark Wang
2021-05-21  6:32   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 07/18] i2c: imx-lpi2c: manage irq resource request/release in runtime pm Clark Wang
2021-05-21  6:38   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 08/18] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work Clark Wang
2021-05-21  6:43   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 09/18] i2c: imx-lpi2c: increase PM timeout to avoid operate clk frequently Clark Wang
2021-04-06 11:32 ` [PATCH V2 10/18] i2c: imx-lpi2c: add bus recovery feature Clark Wang
2021-04-07  0:34   ` kernel test robot
2021-05-21  6:44   ` Aisheng Dong
2021-04-06 11:32 ` [PATCH V2 11/18] dt-bindings: i2c: imx-lpi2c: Add bus recovery example Clark Wang
2021-04-06 13:24   ` Rob Herring
2021-05-21  7:02   ` Aisheng Dong
2021-04-06 11:33 ` [PATCH V2 12/18] i2c: imx-lpi2c: fix i2c timing issue Clark Wang
2021-04-06 11:33 ` [PATCH V2 13/18] i2c: imx-lpi2c: fix type char overflow issue when calculating the clock cycle Clark Wang
2021-04-06 11:33 ` [PATCH V2 14/18] i2c: imx-lpi2c: add edma mode support Clark Wang
2021-04-06 11:41   ` Clark Wang
2021-04-06 11:33 ` [PATCH V2 15/18] dt-bindings: i2c: imx-lpi2c: Add dma configuration example Clark Wang
2021-04-09 16:33   ` Rob Herring
2021-04-06 11:33 ` [PATCH V2 16/18] ARM: dts: imx7ulp: add dma configurations for lpi2c Clark Wang
2021-04-06 11:33 ` [PATCH V2 17/18] ARM: dts: imx7ulp: add the missing status property of lpi2c5 Clark Wang
2021-04-06 11:33 ` Clark Wang [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210406113306.2633595-19-xiaoning.wang@nxp.com \
    --to=xiaoning.wang@nxp.com \
    --cc=aisheng.dong@nxp.com \
    --cc=devicetree@vger.kernel.org \
    --cc=festevam@gmail.com \
    --cc=kernel@pengutronix.de \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).