diff options
Diffstat (limited to 'target/linux/ipq40xx/patches-4.14/088-0005-i2c-qup-schedule-EOT-and-FLUSH-tags-at-the-end-of-tr.patch')
| -rw-r--r-- | target/linux/ipq40xx/patches-4.14/088-0005-i2c-qup-schedule-EOT-and-FLUSH-tags-at-the-end-of-tr.patch | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/target/linux/ipq40xx/patches-4.14/088-0005-i2c-qup-schedule-EOT-and-FLUSH-tags-at-the-end-of-tr.patch b/target/linux/ipq40xx/patches-4.14/088-0005-i2c-qup-schedule-EOT-and-FLUSH-tags-at-the-end-of-tr.patch deleted file mode 100644 index cbede84cfe..0000000000 --- a/target/linux/ipq40xx/patches-4.14/088-0005-i2c-qup-schedule-EOT-and-FLUSH-tags-at-the-end-of-tr.patch +++ /dev/null @@ -1,126 +0,0 @@ -From c5adc0fa63a930e3313c74bb7c1d4d158130eb41 Mon Sep 17 00:00:00 2001 -From: Abhishek Sahu <absahu@codeaurora.org> -Date: Mon, 12 Mar 2018 18:44:54 +0530 -Subject: [PATCH 05/13] i2c: qup: schedule EOT and FLUSH tags at the end of - transfer - -The role of FLUSH and EOT tag is to flush already scheduled -descriptors in BAM HW in case of error. EOT is required only -when descriptors are scheduled in RX FIFO. If all the messages -are WRITE, then only FLUSH tag will be used. - -A single BAM transfer can have multiple read and write messages. -The EOT and FLUSH tags should be scheduled at the end of BAM HW -descriptors. Since the READ and WRITE can be present in any order -so for some of the cases, these tags are not being written -correctly. - -Following is one of the example - - READ, READ, READ, READ - -Currently EOT and FLUSH tags are being written after each READ. -If QUP gets NACK for first READ itself, then flush will be -triggered. It will look for first FLUSH tag in TX FIFO and will -stop there so only descriptors for first READ descriptors be -flushed. All the scheduled descriptors should be cleared to -generate BAM DMA completion. - -Now this patch is scheduling FLUSH and EOT only once after all the -descriptors. So, flush will clear all the scheduled descriptors and -BAM will generate the completion interrupt. - -Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> -Reviewed-by: Sricharan R <sricharan@codeaurora.org> -Signed-off-by: Wolfram Sang <wsa@the-dreams.de> ---- - drivers/i2c/busses/i2c-qup.c | 39 ++++++++++++++++++++++-------------- - 1 file changed, 24 insertions(+), 15 deletions(-) - ---- a/drivers/i2c/busses/i2c-qup.c -+++ b/drivers/i2c/busses/i2c-qup.c -@@ -551,7 +551,7 @@ static int qup_i2c_set_tags_smb(u16 addr - } - - static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup, -- struct i2c_msg *msg, int is_dma) -+ struct i2c_msg *msg) - { - u16 addr = i2c_8bit_addr_from_msg(msg); - int len = 0; -@@ -592,11 +592,6 @@ static int qup_i2c_set_tags(u8 *tags, st - else - tags[len++] = data_len; - -- if ((msg->flags & I2C_M_RD) && last && is_dma) { -- tags[len++] = QUP_BAM_INPUT_EOT; -- tags[len++] = QUP_BAM_FLUSH_STOP; -- } -- - return len; - } - -@@ -605,7 +600,7 @@ static int qup_i2c_issue_xfer_v2(struct - int data_len = 0, tag_len, index; - int ret; - -- tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg, 0); -+ tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg); - index = msg->len - qup->blk.data_len; - - /* only tags are written for read */ -@@ -701,7 +696,7 @@ static int qup_i2c_bam_do_xfer(struct qu - while (qup->blk.pos < blocks) { - tlen = (i == (blocks - 1)) ? rem : limit; - tags = &qup->start_tag.start[off + len]; -- len += qup_i2c_set_tags(tags, qup, msg, 1); -+ len += qup_i2c_set_tags(tags, qup, msg); - qup->blk.data_len -= tlen; - - /* scratch buf to read the start and len tags */ -@@ -729,17 +724,11 @@ static int qup_i2c_bam_do_xfer(struct qu - return ret; - - off += len; -- /* scratch buf to read the BAM EOT and FLUSH tags */ -- ret = qup_sg_set_buf(&qup->brx.sg[rx_cnt++], -- &qup->brx.tag.start[0], -- 2, qup, DMA_FROM_DEVICE); -- if (ret) -- return ret; - } else { - while (qup->blk.pos < blocks) { - tlen = (i == (blocks - 1)) ? rem : limit; - tags = &qup->start_tag.start[off + tx_len]; -- len = qup_i2c_set_tags(tags, qup, msg, 1); -+ len = qup_i2c_set_tags(tags, qup, msg); - qup->blk.data_len -= tlen; - - ret = qup_sg_set_buf(&qup->btx.sg[tx_cnt++], -@@ -779,6 +768,26 @@ static int qup_i2c_bam_do_xfer(struct qu - msg++; - } - -+ /* schedule the EOT and FLUSH I2C tags */ -+ len = 1; -+ if (rx_cnt) { -+ qup->btx.tag.start[0] = QUP_BAM_INPUT_EOT; -+ len++; -+ -+ /* scratch buf to read the BAM EOT and FLUSH tags */ -+ ret = qup_sg_set_buf(&qup->brx.sg[rx_cnt++], -+ &qup->brx.tag.start[0], -+ 2, qup, DMA_FROM_DEVICE); -+ if (ret) -+ return ret; -+ } -+ -+ qup->btx.tag.start[len - 1] = QUP_BAM_FLUSH_STOP; -+ ret = qup_sg_set_buf(&qup->btx.sg[tx_cnt++], &qup->btx.tag.start[0], -+ len, qup, DMA_TO_DEVICE); -+ if (ret) -+ return ret; -+ - txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_cnt, - DMA_MEM_TO_DEV, - DMA_PREP_INTERRUPT | DMA_PREP_FENCE); |