UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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 <absahu@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Abhishek Sahu 2018-03-12 18:44:52 +05:30 committed by Wolfram Sang
parent 7239872fb3
commit eb422b539c
1 changed files with 11 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/i2c/busses/i2c-qup.c
View File

@ -181,6 +181,8 @@ struct qup_i2c_dev {
/* dma parameters */
bool is_dma;
/* To check if the current transfer is using DMA */
bool use_dma;
struct dma_pool *dpool;
struct qup_i2c_tag start_tag;
struct qup_i2c_bam brx;
@ -1288,7 +1290,7 @@ 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;
@ -1317,13 +1319,12 @@ 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;
@ -1347,15 +1348,17 @@ 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);