From eb422b539c1f39faf576826b54be93e84d9cb32a Mon Sep 17 00:00:00 2001 From: Abhishek Sahu Date: Mon, 12 Mar 2018 18:44:52 +0530 Subject: [PATCH 03/13] 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 Reviewed-by: Austin Christ Reviewed-by: Andy Gross Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-qup.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -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_ad 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_ad 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_ad 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);