[2/3] i2c: mediatek: Dump i2c/dma register when a timeout occurs

Message ID 1623122200-1896-3-git-send-email-kewei.xu@mediatek.com
State Superseded
Headers show
Series
  • add i2c support for mt8195
Related show

Commit Message

Kewei Xu June 8, 2021, 3:16 a.m.
From: "Kewei.Xu" <kewei.xu@mediatek.com>

When a timeout error occurs in i2c transter, it is usually related
to the i2c/dma IP hardware configuration. Therefore, the purpose of
this patch is to dump the key register values of i2c/dma when a
timeout occurs in i2c for debugging.

Signed-off-by: Kewei.Xu <kewei.xu@mediatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 97 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 95 insertions(+), 2 deletions(-)

Comments

Kewei Xu June 9, 2021, 2:43 a.m. | #1
On Tue, 2021-06-08 at 16:01 +0200, Matthias Brugger wrote:
> 

> On 08/06/2021 05:16, Kewei Xu wrote:

> > From: "Kewei.Xu" <kewei.xu@mediatek.com>

> > 

> > When a timeout error occurs in i2c transter, it is usually related

> > to the i2c/dma IP hardware configuration. Therefore, the purpose of

> > this patch is to dump the key register values of i2c/dma when a

> > timeout occurs in i2c for debugging.

> > 

> > Signed-off-by: Kewei.Xu <kewei.xu@mediatek.com>

> > ---

> >  drivers/i2c/busses/i2c-mt65xx.c | 97 ++++++++++++++++++++++++++++++++++++++++-

> >  1 file changed, 95 insertions(+), 2 deletions(-)

> > 

> > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c

> > index 5ddfa4e..e65a41e 100644

> > --- a/drivers/i2c/busses/i2c-mt65xx.c

> > +++ b/drivers/i2c/busses/i2c-mt65xx.c

> > @@ -125,6 +125,7 @@ enum I2C_REGS_OFFSET {

> >  	OFFSET_HS,

> >  	OFFSET_SOFTRESET,

> >  	OFFSET_DCM_EN,

> > +	OFFSET_MULTI_DMA,

> >  	OFFSET_PATH_DIR,

> >  	OFFSET_DEBUGSTAT,

> >  	OFFSET_DEBUGCTRL,

> > @@ -192,8 +193,9 @@ enum I2C_REGS_OFFSET {

> >  	[OFFSET_TRANSFER_LEN_AUX] = 0x44,

> >  	[OFFSET_CLOCK_DIV] = 0x48,

> >  	[OFFSET_SOFTRESET] = 0x50,

> > +	[OFFSET_MULTI_DMA] = 0x84,

> >  	[OFFSET_SCL_MIS_COMP_POINT] = 0x90,

> > -	[OFFSET_DEBUGSTAT] = 0xe0,

> > +	[OFFSET_DEBUGSTAT] = 0xe4,

> 

> Is this offset only for mt8192 or also for mt8183?

> In any case that should go in as another patch. Either a fix or a new

> mt_i2c_regs_v3[]

> 

> Regards,

  Matthias

Hi Matthias,

This offset value is suitable for the IC of mt_i2c_regs_v2 hardware
design similar to mt8192/8195, not for 8183.

The reason for the modification here is that the previous
offset information is incorrect, OFFSET_DEBUGSTAT = 0XE4 is
the correct value.

Regards,
Kewei
Tzung-Bi Shih June 29, 2021, 4:19 a.m. | #2
On Wed, Jun 9, 2021 at 10:44 AM Kewei Xu <kewei.xu@mediatek.com> wrote:
>

> On Tue, 2021-06-08 at 16:01 +0200, Matthias Brugger wrote:

> > Is this offset only for mt8192 or also for mt8183?

> > In any case that should go in as another patch. Either a fix or a new

> > mt_i2c_regs_v3[]

>

> This offset value is suitable for the IC of mt_i2c_regs_v2 hardware

> design similar to mt8192/8195, not for 8183.

>

> The reason for the modification here is that the previous

> offset information is incorrect, OFFSET_DEBUGSTAT = 0XE4 is

> the correct value.


Please submit another patch for fixing the incorrect value.
Kewei Xu June 29, 2021, 12:12 p.m. | #3
On Tue, 2021-06-29 at 12:19 +0800, Tzung-Bi Shih wrote:
> On Wed, Jun 9, 2021 at 10:44 AM Kewei Xu <kewei.xu@mediatek.com> wrote:

> >

> > On Tue, 2021-06-08 at 16:01 +0200, Matthias Brugger wrote:

> > > Is this offset only for mt8192 or also for mt8183?

> > > In any case that should go in as another patch. Either a fix or a new

> > > mt_i2c_regs_v3[]

> >

> > This offset value is suitable for the IC of mt_i2c_regs_v2 hardware

> > design similar to mt8192/8195, not for 8183.

> >

> > The reason for the modification here is that the previous

> > offset information is incorrect, OFFSET_DEBUGSTAT = 0XE4 is

> > the correct value.

> 

> Please submit another patch for fixing the incorrect value.


Okay, I will resubmit a patch to fixing the incorrect value,Thanks.

Patch

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index 5ddfa4e..e65a41e 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -125,6 +125,7 @@  enum I2C_REGS_OFFSET {
 	OFFSET_HS,
 	OFFSET_SOFTRESET,
 	OFFSET_DCM_EN,
+	OFFSET_MULTI_DMA,
 	OFFSET_PATH_DIR,
 	OFFSET_DEBUGSTAT,
 	OFFSET_DEBUGCTRL,
@@ -192,8 +193,9 @@  enum I2C_REGS_OFFSET {
 	[OFFSET_TRANSFER_LEN_AUX] = 0x44,
 	[OFFSET_CLOCK_DIV] = 0x48,
 	[OFFSET_SOFTRESET] = 0x50,
+	[OFFSET_MULTI_DMA] = 0x84,
 	[OFFSET_SCL_MIS_COMP_POINT] = 0x90,
-	[OFFSET_DEBUGSTAT] = 0xe0,
+	[OFFSET_DEBUGSTAT] = 0xe4,
 	[OFFSET_DEBUGCTRL] = 0xe8,
 	[OFFSET_FIFO_STAT] = 0xf4,
 	[OFFSET_FIFO_THRESH] = 0xf8,
@@ -828,6 +830,96 @@  static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
 	return 0;
 }
 
+static void i2c_dump_register(struct mtk_i2c *i2c)
+{
+	dev_err(i2c->dev, "SLAVE_ADDR[0x%x]: 0x%x, INTR_MASK[0x%x]: 0x%x\n",
+		OFFSET_SLAVE_ADDR,
+		(mtk_i2c_readw(i2c, OFFSET_SLAVE_ADDR)),
+		OFFSET_INTR_MASK,
+		(mtk_i2c_readw(i2c, OFFSET_INTR_MASK)));
+	dev_err(i2c->dev, "INTR_STAT[0x%x]: 0x%x, CONTROL[0x%x]: 0x%x\n",
+		OFFSET_INTR_STAT,
+		(mtk_i2c_readw(i2c, OFFSET_INTR_STAT)),
+		OFFSET_CONTROL,
+		(mtk_i2c_readw(i2c, OFFSET_CONTROL)));
+	dev_err(i2c->dev, "TRANSFER_LEN[0x%x]: 0x%x, TRANSAC_LEN[0x%x]: 0x%x\n",
+		OFFSET_TRANSFER_LEN,
+		(mtk_i2c_readw(i2c, OFFSET_TRANSFER_LEN)),
+		OFFSET_TRANSAC_LEN,
+		(mtk_i2c_readw(i2c, OFFSET_TRANSAC_LEN)));
+	dev_err(i2c->dev, "DELAY_LEN[0x%x]: 0x%x, HTIMING[0x%x]: 0x%x\n",
+		OFFSET_DELAY_LEN,
+		(mtk_i2c_readw(i2c, OFFSET_DELAY_LEN)),
+		OFFSET_TIMING,
+		(mtk_i2c_readw(i2c, OFFSET_TIMING)));
+	dev_err(i2c->dev, "OFFSET_START[0x%x]: 0x%x\n",
+		OFFSET_START,
+		mtk_i2c_readw(i2c, OFFSET_START));
+	dev_err(i2c->dev, "OFFSET_EXT_CONF[0x%x]: 0x%x\n",
+		OFFSET_EXT_CONF,
+		mtk_i2c_readw(i2c, OFFSET_EXT_CONF));
+	dev_err(i2c->dev, "OFFSET_HS[0x%x]: 0x%x\n",
+		OFFSET_HS,
+		mtk_i2c_readw(i2c, OFFSET_HS));
+	dev_err(i2c->dev, "OFFSET_IO_CONFIG[0x%x]: 0x%x\n",
+		OFFSET_IO_CONFIG,
+		mtk_i2c_readw(i2c, OFFSET_IO_CONFIG));
+	dev_err(i2c->dev, "OFFSET_FIFO_ADDR_CLR[0x%x]: 0x%x\n",
+		OFFSET_FIFO_ADDR_CLR,
+		mtk_i2c_readw(i2c, OFFSET_FIFO_ADDR_CLR));
+	dev_err(i2c->dev, "TRANSFER_LEN_AUX[0x%x]: 0x%x\n",
+		OFFSET_TRANSFER_LEN_AUX,
+		mtk_i2c_readw(i2c, OFFSET_TRANSFER_LEN_AUX));
+	dev_err(i2c->dev, "CLOCK_DIV[0x%x]: 0x%x\n",
+		OFFSET_CLOCK_DIV,
+		mtk_i2c_readw(i2c, OFFSET_CLOCK_DIV));
+	dev_err(i2c->dev, "FIFO_STAT[0x%x]: 0x%x, FIFO_THRESH[0x%x]: 0x%x\n",
+		OFFSET_FIFO_STAT,
+		mtk_i2c_readw(i2c, OFFSET_FIFO_STAT),
+		OFFSET_FIFO_THRESH,
+		mtk_i2c_readw(i2c, OFFSET_FIFO_THRESH));
+	dev_err(i2c->dev, "DCM_EN[0x%x] 0x%x\n",
+		OFFSET_DCM_EN,
+		mtk_i2c_readw(i2c, OFFSET_DCM_EN));
+	dev_err(i2c->dev, "DEBUGSTAT[0x%x]: 0x%x, DEBUGCTRL[0x%x]: 0x%x\n",
+		OFFSET_DEBUGSTAT,
+		(mtk_i2c_readw(i2c, OFFSET_DEBUGSTAT)),
+		OFFSET_DEBUGCTRL,
+		(mtk_i2c_readw(i2c, OFFSET_DEBUGCTRL)));
+
+	if (i2c->dev_comp->regs == mt_i2c_regs_v2) {
+		dev_err(i2c->dev, "OFFSET_LTIMING[0x%x]: 0x%x\n",
+			OFFSET_LTIMING,
+			mtk_i2c_readw(i2c, OFFSET_LTIMING));
+		dev_err(i2c->dev, "MULTI_DMA[0x%x]: 0x%x\n",
+			OFFSET_MULTI_DMA,
+			(mtk_i2c_readw(i2c, OFFSET_MULTI_DMA)));
+	}
+
+	dev_err(i2c->dev, "OFFSET_INT_FLAG = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_INT_FLAG));
+	dev_err(i2c->dev, "OFFSET_INT_EN = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_INT_EN));
+	dev_err(i2c->dev, "OFFSET_EN = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_EN));
+	dev_err(i2c->dev, "OFFSET_RST = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_RST));
+	dev_err(i2c->dev, "OFFSET_CON = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_CON));
+	dev_err(i2c->dev, "OFFSET_TX_MEM_ADDR = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_TX_MEM_ADDR));
+	dev_err(i2c->dev, "OFFSET_RX_MEM_ADDR = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_RX_MEM_ADDR));
+	dev_err(i2c->dev, "OFFSET_TX_LEN = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_TX_LEN));
+	dev_err(i2c->dev, "OFFSET_RX_LEN = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_RX_LEN));
+	dev_err(i2c->dev, "OFFSET_TX_4G_MODE = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_TX_4G_MODE));
+	dev_err(i2c->dev, "OFFSET_RX_4G_MODE = 0x%x\n",
+		readl(i2c->pdmabase + OFFSET_RX_4G_MODE));
+}
+
 static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 			       int num, int left_num)
 {
@@ -1034,7 +1126,8 @@  static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 	}
 
 	if (ret == 0) {
-		dev_dbg(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr);
+		dev_err(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr);
+		i2c_dump_register(i2c);
 		mtk_i2c_init_hw(i2c);
 		return -ETIMEDOUT;
 	}