* [PATCH 2/7 v4] i2c-eg20t: Modify returned value s32 to long
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
@ 2011-10-12 4:13 ` Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 3/7 v2] i2c-eg20t: Fix 10bit access issue Tomoya MORINAGA
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA
Type of wait_event_timeout is long not s32.
This patch replaces s32 with long.
Additionally, delete negative processing(ret < 0).
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
drivers/i2c/busses/i2c-eg20t.c | 6 +-----
1 files changed, 1 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index d1cd304..5ecbee0 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -314,13 +314,9 @@ static void pch_i2c_start(struct i2c_algo_pch_data *adap)
*/
static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap)
{
- s32 ret;
+ long ret;
ret = wait_event_timeout(pch_event,
(adap->pch_event_flag != 0), msecs_to_jiffies(50));
- if (ret < 0) {
- pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
- return ret;
- }
if (ret == 0) {
pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 3/7 v2] i2c-eg20t: Fix 10bit access issue
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
2011-10-12 4:13 ` [PATCH 2/7 v4] i2c-eg20t: Modify returned value s32 to long Tomoya MORINAGA
@ 2011-10-12 4:13 ` Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 4/7 v4] i2c-eg20t: Separate error processing Tomoya MORINAGA
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA
Reported-by: Jeffrey (Sheng-Hui) Chu <jeffchu-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
V2: Update Jeffrey's comments.
---
drivers/i2c/busses/i2c-eg20t.c | 65 ++++++++++++++++++++++++++++++++++++++-
1 files changed, 63 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 5ecbee0..6ee719c 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -64,6 +64,7 @@
#define TEN_BIT_ADDR_DEFAULT 0xF000
#define TEN_BIT_ADDR_MASK 0xF0
#define PCH_START 0x0020
+#define PCH_RESTART 0x0004
#define PCH_ESR_START 0x0001
#define PCH_BUFF_START 0x1
#define PCH_REPSTART 0x0004
@@ -411,7 +412,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
}
if (msgs->flags & I2C_M_TEN) {
- addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
+ addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7) & 0x06;
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
if (first)
pch_i2c_start(adap);
@@ -483,6 +484,19 @@ static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap)
}
/**
+ * pch_i2c_restart() - Generate I2C restart condition in normal mode.
+ * @adap: Pointer to struct i2c_algo_pch_data.
+ *
+ * Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA.
+ */
+static void pch_i2c_restart(struct i2c_algo_pch_data *adap)
+{
+ void __iomem *p = adap->pch_base_address;
+ pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
+ pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART);
+}
+
+/**
* pch_i2c_readbytes() - read data from I2C bus in normal mode.
* @i2c_adap: Pointer to the struct i2c_adapter.
* @msgs: Pointer to i2c_msg structure.
@@ -499,6 +513,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
u32 length;
u32 addr;
u32 addr_2_msb;
+ u32 addr_8_lsb;
void __iomem *p = adap->pch_base_address;
length = msgs->len;
@@ -514,9 +529,55 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
}
if (msgs->flags & I2C_M_TEN) {
- addr_2_msb = (((addr & I2C_MSB_2B_MSK) >> 7) | (I2C_RD));
+ addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
+ if (first)
+ pch_i2c_start(adap);
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
+ addr_8_lsb = (addr & I2C_ADDR_MSK);
+ iowrite32(addr_8_lsb, p + PCH_I2CDR);
+ } else if (rtn == -EIO) { /* Arbitration Lost */
+ pch_err(adap, "Lost Arbitration\n");
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMIF_BIT);
+ pch_i2c_init(adap);
+ return -EAGAIN;
+ } else { /* wait-event timeout */
+ pch_i2c_stop(adap);
+ return -ETIME;
+ }
+ pch_i2c_restart(adap);
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
+ addr_2_msb |= I2C_RD;
+ iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK,
+ p + PCH_I2CDR);
+ } else if (rtn == -EIO) { /* Arbitration Lost */
+ pch_err(adap, "Lost Arbitration\n");
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMIF_BIT);
+ pch_i2c_init(adap);
+ return -EAGAIN;
+ } else { /* wait-event timeout */
+ pch_i2c_stop(adap);
+ return -ETIME;
+ }
} else {
/* 7 address bits + R/W bit */
addr = (((addr) << 1) | (I2C_RD));
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 4/7 v4] i2c-eg20t: Separate error processing
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
2011-10-12 4:13 ` [PATCH 2/7 v4] i2c-eg20t: Modify returned value s32 to long Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 3/7 v2] i2c-eg20t: Fix 10bit access issue Tomoya MORINAGA
@ 2011-10-12 4:13 ` Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 5/7 v4] i2c-eg20t: add stop sequence in case wait-event timeout occurs Tomoya MORINAGA
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA, Tomoya MORINAGA
From: Tomoya MORINAGA <tomoya-linux-ECg8zkTtlr0C6LszWs/t0g@public.gmane.org>
Error processing for NACK or wait-event must be precessed separately.
So divide wait-event error processing into NACK-receiving and timeout.
Add arbitration lost processing.
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
drivers/i2c/busses/i2c-eg20t.c | 173 ++++++++++++++++++++++++++-------------
1 files changed, 115 insertions(+), 58 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 6ee719c..0693246 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -394,6 +394,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
u32 addr_2_msb;
u32 addr_8_lsb;
s32 wrcount;
+ s32 rtn;
void __iomem *p = adap->pch_base_address;
length = msgs->len;
@@ -416,11 +417,25 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
if (first)
pch_i2c_start(adap);
- if (pch_i2c_wait_for_xfer_complete(adap) == 0 &&
- pch_i2c_getack(adap) == 0) {
+
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
addr_8_lsb = (addr & I2C_ADDR_MSK);
iowrite32(addr_8_lsb, p + PCH_I2CDR);
- } else {
+ } else if (rtn == -EIO) { /* Arbitration Lost */
+ pch_err(adap, "Lost Arbitration\n");
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMIF_BIT);
+ pch_i2c_init(adap);
+ return -EAGAIN;
+ } else { /* wait-event timeout */
pch_i2c_stop(adap);
return -ETIME;
}
@@ -431,30 +446,48 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
pch_i2c_start(adap);
}
- if ((pch_i2c_wait_for_xfer_complete(adap) == 0) &&
- (pch_i2c_getack(adap) == 0)) {
- for (wrcount = 0; wrcount < length; ++wrcount) {
- /* write buffer value to I2C data register */
- iowrite32(buf[wrcount], p + PCH_I2CDR);
- pch_dbg(adap, "writing %x to Data register\n",
- buf[wrcount]);
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
+ } else if (rtn == -EIO) { /* Arbitration Lost */
+ pch_err(adap, "Lost Arbitration\n");
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+ return -EAGAIN;
+ } else { /* wait-event timeout */
+ return -ETIME;
+ }
- if (pch_i2c_wait_for_xfer_complete(adap) != 0)
- return -ETIME;
+ for (wrcount = 0; wrcount < length; ++wrcount) {
+ /* write buffer value to I2C data register */
+ iowrite32(buf[wrcount], p + PCH_I2CDR);
+ pch_dbg(adap, "writing %x to Data register\n", buf[wrcount]);
- if (pch_i2c_getack(adap))
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
return -EIO;
+ }
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMCF_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR,
+ I2CMIF_BIT);
+ } else { /* wait-event timeout */
+ return -ETIME;
}
+ }
- /* check if this is the last message */
- if (last)
- pch_i2c_stop(adap);
- else
- pch_i2c_repstart(adap);
- } else {
+ /* check if this is the last message */
+ if (last)
pch_i2c_stop(adap);
- return -EIO;
- }
+ else
+ pch_i2c_repstart(adap);
pch_dbg(adap, "return=%d\n", wrcount);
@@ -515,6 +548,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
u32 addr_2_msb;
u32 addr_8_lsb;
void __iomem *p = adap->pch_base_address;
+ s32 rtn;
length = msgs->len;
buf = msgs->buf;
@@ -588,56 +622,79 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
if (first)
pch_i2c_start(adap);
- if ((pch_i2c_wait_for_xfer_complete(adap) == 0) &&
- (pch_i2c_getack(adap) == 0)) {
- pch_dbg(adap, "return %d\n", 0);
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
+ } else if (rtn == -EIO) { /* Arbitration Lost */
+ pch_err(adap, "Lost Arbitration\n");
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+ return -EAGAIN;
+ } else { /* wait-event timeout */
+ return -ETIME;
+ }
- if (length == 0) {
- pch_i2c_stop(adap);
- ioread32(p + PCH_I2CDR); /* Dummy read needs */
+ if (length == 0) {
+ pch_i2c_stop(adap);
+ ioread32(p + PCH_I2CDR); /* Dummy read needs */
- count = length;
- } else {
- int read_index;
- int loop;
- pch_i2c_sendack(adap);
+ count = length;
+ } else {
+ int read_index;
+ int loop;
+ pch_i2c_sendack(adap);
- /* Dummy read */
- for (loop = 1, read_index = 0; loop < length; loop++) {
- buf[read_index] = ioread32(p + PCH_I2CDR);
+ /* Dummy read */
+ for (loop = 1, read_index = 0; loop < length; loop++) {
+ buf[read_index] = ioread32(p + PCH_I2CDR);
- if (loop != 1)
- read_index++;
+ if (loop != 1)
+ read_index++;
- if (pch_i2c_wait_for_xfer_complete(adap) != 0) {
- pch_i2c_stop(adap);
- return -ETIME;
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave"
+ "address setting\n");
+ return -EIO;
}
- } /* end for */
+ } else { /* wait-event timeout */
+ pch_i2c_stop(adap);
+ return -ETIME;
+ }
- pch_i2c_sendnack(adap);
+ } /* end for */
- buf[read_index] = ioread32(p + PCH_I2CDR);
+ pch_i2c_sendnack(adap);
- if (length != 1)
- read_index++;
+ buf[read_index] = ioread32(p + PCH_I2CDR); /* Read final - 1 */
- if (pch_i2c_wait_for_xfer_complete(adap) == 0) {
- if (last)
- pch_i2c_stop(adap);
- else
- pch_i2c_repstart(adap);
+ if (length != 1)
+ read_index++;
- buf[read_index++] = ioread32(p + PCH_I2CDR);
- count = read_index;
- } else {
- count = -ETIME;
+ rtn = pch_i2c_wait_for_xfer_complete(adap);
+ if (rtn == 0) {
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave"
+ "address setting\n");
+ return -EIO;
}
-
+ } else { /* wait-event timeout */
+ pch_i2c_stop(adap);
+ return -ETIME;
}
- } else {
- count = -ETIME;
- pch_i2c_stop(adap);
+
+ if (last)
+ pch_i2c_stop(adap);
+ else
+ pch_i2c_repstart(adap);
+
+ buf[read_index++] = ioread32(p + PCH_I2CDR); /* Read Final */
+ count = read_index;
}
return count;
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 5/7 v4] i2c-eg20t: add stop sequence in case wait-event timeout occurs
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
` (2 preceding siblings ...)
2011-10-12 4:13 ` [PATCH 4/7 v4] i2c-eg20t: Separate error processing Tomoya MORINAGA
@ 2011-10-12 4:13 ` Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 6/7 v4] i2c-eg20t: Fix flag setting issue Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 7/7 v4] i2c-eg20t: Add initialize processing in case i2c-error occurs Tomoya MORINAGA
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA
add stop sequence in case wait-event timeout in write processing.
(read processing already had it)
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
drivers/i2c/busses/i2c-eg20t.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 0693246..116708d 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -459,6 +459,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
return -EAGAIN;
} else { /* wait-event timeout */
+ pch_i2c_stop(adap);
return -ETIME;
}
@@ -479,6 +480,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
pch_clrbit(adap->pch_base_address, PCH_I2CSR,
I2CMIF_BIT);
} else { /* wait-event timeout */
+ pch_i2c_stop(adap);
return -ETIME;
}
}
@@ -635,6 +637,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
return -EAGAIN;
} else { /* wait-event timeout */
+ pch_i2c_stop(adap);
return -ETIME;
}
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 6/7 v4] i2c-eg20t: Fix flag setting issue
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
` (3 preceding siblings ...)
2011-10-12 4:13 ` [PATCH 5/7 v4] i2c-eg20t: add stop sequence in case wait-event timeout occurs Tomoya MORINAGA
@ 2011-10-12 4:13 ` Tomoya MORINAGA
2011-10-12 4:13 ` [PATCH 7/7 v4] i2c-eg20t: Add initialize processing in case i2c-error occurs Tomoya MORINAGA
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA
Currently, in case occurring abnormal event,
internal flag variable(=pch_event_flag) is not reset.
This patch fixes the issue.
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
drivers/i2c/busses/i2c-eg20t.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 116708d..e25b8eb 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -321,11 +321,13 @@ static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap)
if (ret == 0) {
pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
+ adap->pch_event_flag = 0;
return -ETIMEDOUT;
}
if (adap->pch_event_flag & I2C_ERROR_MASK) {
pch_err(adap, "error bits set: %x\n", adap->pch_event_flag);
+ adap->pch_event_flag = 0;
return -EIO;
}
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 7/7 v4] i2c-eg20t: Add initialize processing in case i2c-error occurs
[not found] ` <1318392786-23610-1-git-send-email-tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
` (4 preceding siblings ...)
2011-10-12 4:13 ` [PATCH 6/7 v4] i2c-eg20t: Fix flag setting issue Tomoya MORINAGA
@ 2011-10-12 4:13 ` Tomoya MORINAGA
5 siblings, 0 replies; 6+ messages in thread
From: Tomoya MORINAGA @ 2011-10-12 4:13 UTC (permalink / raw)
To: Jean Delvare, Ben Dooks, Wolfram Sang, Qi Wang, Linus Walleij
Cc: yong.y.wang-ral2JQCrhuEAvxtiuMwx3w,
joel.clark-ral2JQCrhuEAvxtiuMwx3w,
kok.howg.ewe-ral2JQCrhuEAvxtiuMwx3w,
jeffchu-dY08KVG/lbpWk0Htik3J/w, Tomoya MORINAGA
In case disconnecting physical connection,
need to initialize i2c device for retry access.
This patch adds initialize process in case bus-idle fails and Lost arbitration.
Signed-off-by: Tomoya MORINAGA <tomoya-linux-8lRStDepK8iSL1NxhRU65dBPR1lH4CV8@public.gmane.org>
---
drivers/i2c/busses/i2c-eg20t.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index e25b8eb..5521099 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -292,6 +292,7 @@ static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR));
pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME);
+ pch_i2c_init(adap);
return -ETIME;
}
@@ -459,6 +460,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
pch_err(adap, "Lost Arbitration\n");
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+ pch_i2c_init(adap);
return -EAGAIN;
} else { /* wait-event timeout */
pch_i2c_stop(adap);
@@ -637,6 +639,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
pch_err(adap, "Lost Arbitration\n");
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+ pch_i2c_init(adap);
return -EAGAIN;
} else { /* wait-event timeout */
pch_i2c_stop(adap);
--
1.7.4.4
^ permalink raw reply related [flat|nested] 6+ messages in thread