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55 lines
1.7 KiB
Diff
55 lines
1.7 KiB
Diff
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From 08f15963bc751bc818294c0f75a9aaca299c4052 Mon Sep 17 00:00:00 2001
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From: Abhishek Sahu <absahu@codeaurora.org>
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Date: Mon, 12 Mar 2018 18:44:57 +0530
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Subject: [PATCH 08/13] i2c: qup: use the complete transfer length to choose
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DMA mode
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Currently each message length in complete transfer is being
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checked for determining DMA mode and if any of the message length
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is less than FIFO length then non DMA mode is being used which
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will increase overhead. DMA can be used for any length and it
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should be determined with complete transfer length. Now, this
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patch selects DMA mode if the total length is greater than FIFO
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length.
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Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
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Reviewed-by: Austin Christ <austinwc@codeaurora.org>
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Reviewed-by: Andy Gross <andy.gross@linaro.org>
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Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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---
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drivers/i2c/busses/i2c-qup.c | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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--- a/drivers/i2c/busses/i2c-qup.c
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+++ b/drivers/i2c/busses/i2c-qup.c
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@@ -1300,7 +1300,8 @@ static int qup_i2c_xfer_v2(struct i2c_ad
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int num)
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{
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struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
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- int ret, len, idx = 0;
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+ int ret, idx = 0;
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+ unsigned int total_len = 0;
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qup->bus_err = 0;
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qup->qup_err = 0;
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@@ -1326,14 +1327,14 @@ static int qup_i2c_xfer_v2(struct i2c_ad
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goto out;
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}
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- len = (msgs[idx].len > qup->out_fifo_sz) ||
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- (msgs[idx].len > qup->in_fifo_sz);
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-
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- if (is_vmalloc_addr(msgs[idx].buf) || !len)
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+ if (is_vmalloc_addr(msgs[idx].buf))
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break;
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+
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+ total_len += msgs[idx].len;
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}
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- if (idx == num)
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+ if (idx == num && (total_len > qup->out_fifo_sz ||
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+ total_len > qup->in_fifo_sz))
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qup->use_dma = true;
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}
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