diff options
Diffstat (limited to 'target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch')
| -rw-r--r-- | target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch b/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch new file mode 100644 index 0000000000..3d68695588 --- /dev/null +++ b/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch @@ -0,0 +1,54 @@ +From 08f15963bc751bc818294c0f75a9aaca299c4052 Mon Sep 17 00:00:00 2001 +From: Abhishek Sahu <absahu@codeaurora.org> +Date: Mon, 12 Mar 2018 18:44:57 +0530 +Subject: [PATCH 08/13] i2c: qup: use the complete transfer length to choose + DMA mode + +Currently each message length in complete transfer is being +checked for determining DMA mode and if any of the message length +is less than FIFO length then non DMA mode is being used which +will increase overhead. DMA can be used for any length and it +should be determined with complete transfer length. Now, this +patch selects DMA mode if the total length is greater than FIFO +length. + +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> +--- + drivers/i2c/busses/i2c-qup.c | 13 +++++++------ + 1 file changed, 7 insertions(+), 6 deletions(-) + +--- a/drivers/i2c/busses/i2c-qup.c ++++ b/drivers/i2c/busses/i2c-qup.c +@@ -1300,7 +1300,8 @@ 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; ++ int ret, idx = 0; ++ unsigned int total_len = 0; + + qup->bus_err = 0; + qup->qup_err = 0; +@@ -1326,14 +1327,14 @@ static int qup_i2c_xfer_v2(struct i2c_ad + goto out; + } + +- len = (msgs[idx].len > qup->out_fifo_sz) || +- (msgs[idx].len > qup->in_fifo_sz); +- +- if (is_vmalloc_addr(msgs[idx].buf) || !len) ++ if (is_vmalloc_addr(msgs[idx].buf)) + break; ++ ++ total_len += msgs[idx].len; + } + +- if (idx == num) ++ if (idx == num && (total_len > qup->out_fifo_sz || ++ total_len > qup->in_fifo_sz)) + qup->use_dma = true; + } + |