Re: [PATCH 02/12] i2c: qup: minor code reorganization for use_dma
On Sat, Feb 03, 2018 at 01:28:07PM +0530, Abhishek Sahu wrote: > 1. Assigns use_dma in qup_dev structure itself which will >help in subsequent patches to determine the mode in IRQ handler. > 2. Does minor code reorganization for loops to reduce the >unnecessary comparison and assignment. > > Signed-off-by: Abhishek Sahu Reviewed-by: Andy Gross
Re: [PATCH 02/12] i2c: qup: minor code reorganization for use_dma
Tested on Centriq 2400
Reviewed-by: Austin Christ
On 2/3/2018 12:58 AM, Abhishek Sahu wrote:
1. Assigns use_dma in qup_dev structure itself which will
help in subsequent patches to determine the mode in IRQ handler.
2. Does minor code reorganization for loops to reduce the
unnecessary comparison and assignment.
Signed-off-by: Abhishek Sahu
---
drivers/i2c/busses/i2c-qup.c | 19 +++
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 9faa26c41a..c68f433 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -190,6 +190,8 @@ struct qup_i2c_dev {
/* dma parameters */
boolis_dma;
+ /* To check if the current transfer is using DMA */
+ booluse_dma;
struct dma_pool *dpool;
struct qup_i2c_tag start_tag;
struct qup_i2c_bam brx;
@@ -1297,7 +1299,7 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
int num)
{
struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
- int ret, len, idx = 0, use_dma = 0;
+ int ret, len, idx = 0;
qup->bus_err = 0;
qup->qup_err = 0;
@@ -1326,13 +1328,12 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
len = (msgs[idx].len > qup->out_fifo_sz) ||
(msgs[idx].len > qup->in_fifo_sz);
- if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
- use_dma = 1;
-} else {
- use_dma = 0;
+ if (is_vmalloc_addr(msgs[idx].buf) || !len)
break;
- }
}
+
+ if (idx == num)
+ qup->use_dma = true;
}
idx = 0;
@@ -1356,15 +1357,17 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
reinit_completion(&qup->xfer);
- if (use_dma) {
+ if (qup->use_dma) {
ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
+ qup->use_dma = false;
+ break;
} else {
if (msgs[idx].flags & I2C_M_RD)
ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
else
ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
}
- } while ((idx++ < (num - 1)) && !use_dma && !ret);
+ } while ((idx++ < (num - 1)) && !ret);
if (!ret)
ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
--
Qualcomm Datacenter Technologies as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
[PATCH 02/12] i2c: qup: minor code reorganization for use_dma
1. Assigns use_dma in qup_dev structure itself which will
help in subsequent patches to determine the mode in IRQ handler.
2. Does minor code reorganization for loops to reduce the
unnecessary comparison and assignment.
Signed-off-by: Abhishek Sahu
---
drivers/i2c/busses/i2c-qup.c | 19 +++
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 9faa26c41a..c68f433 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -190,6 +190,8 @@ struct qup_i2c_dev {
/* dma parameters */
boolis_dma;
+ /* To check if the current transfer is using DMA */
+ booluse_dma;
struct dma_pool *dpool;
struct qup_i2c_tag start_tag;
struct qup_i2c_bam brx;
@@ -1297,7 +1299,7 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
int num)
{
struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
- int ret, len, idx = 0, use_dma = 0;
+ int ret, len, idx = 0;
qup->bus_err = 0;
qup->qup_err = 0;
@@ -1326,13 +1328,12 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
len = (msgs[idx].len > qup->out_fifo_sz) ||
(msgs[idx].len > qup->in_fifo_sz);
- if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
- use_dma = 1;
-} else {
- use_dma = 0;
+ if (is_vmalloc_addr(msgs[idx].buf) || !len)
break;
- }
}
+
+ if (idx == num)
+ qup->use_dma = true;
}
idx = 0;
@@ -1356,15 +1357,17 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
reinit_completion(&qup->xfer);
- if (use_dma) {
+ if (qup->use_dma) {
ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
+ qup->use_dma = false;
+ break;
} else {
if (msgs[idx].flags & I2C_M_RD)
ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
else
ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
}
- } while ((idx++ < (num - 1)) && !use_dma && !ret);
+ } while ((idx++ < (num - 1)) && !ret);
if (!ret)
ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
--
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Code Aurora Forum, hosted by The Linux Foundation
