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77 lines
2.2 KiB
Diff
77 lines
2.2 KiB
Diff
From eb422b539c1f39faf576826b54be93e84d9cb32a 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 18:44:52 +0530
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Subject: [PATCH 03/13] i2c: qup: minor code reorganization for use_dma
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1. Assigns use_dma in qup_dev structure itself which will
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help in subsequent patches to determine the mode in IRQ handler.
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2. Does minor code reorganization for loops to reduce the
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unnecessary comparison and assignment.
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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 | 19 +++++++++++--------
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1 file changed, 11 insertions(+), 8 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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@@ -181,6 +181,8 @@ struct qup_i2c_dev {
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/* dma parameters */
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bool is_dma;
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+ /* To check if the current transfer is using DMA */
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+ bool use_dma;
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struct dma_pool *dpool;
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struct qup_i2c_tag start_tag;
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struct qup_i2c_bam brx;
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@@ -1288,7 +1290,7 @@ 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, use_dma = 0;
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+ int ret, len, idx = 0;
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qup->bus_err = 0;
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qup->qup_err = 0;
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@@ -1317,13 +1319,12 @@ static int qup_i2c_xfer_v2(struct i2c_ad
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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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- if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
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- use_dma = 1;
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- } else {
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- use_dma = 0;
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+ if (is_vmalloc_addr(msgs[idx].buf) || !len)
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break;
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- }
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}
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+
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+ if (idx == num)
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+ qup->use_dma = true;
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}
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idx = 0;
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@@ -1347,15 +1348,17 @@ static int qup_i2c_xfer_v2(struct i2c_ad
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reinit_completion(&qup->xfer);
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- if (use_dma) {
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+ if (qup->use_dma) {
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ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
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+ qup->use_dma = false;
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+ break;
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} else {
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if (msgs[idx].flags & I2C_M_RD)
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ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
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else
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ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
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}
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- } while ((idx++ < (num - 1)) && !use_dma && !ret);
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+ } while ((idx++ < (num - 1)) && !ret);
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if (!ret)
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ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
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