[3.19.y-ckt stable] Patch "[stable-only] Revert "spi: rockchip: modify DMA max burst to 1"" has been added to the 3.19.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    [stable-only] Revert "spi: rockchip: modify DMA max burst to 1"

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt19.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 527b58ce96933777cda88ff7f173ee0bda3d7885 Mon Sep 17 00:00:00 2001
From: Kamal Mostafa <kamal at canonical.com>
Date: Tue, 5 Apr 2016 14:38:52 -0700
Subject: [stable-only] Revert "spi: rockchip: modify DMA max burst to 1"

This reverts commit 6f7cc98b61d201f803dce0d4113462c4e10ae698.

Not suitable for 3.19: no max_burst.

Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/spi/spi-rockchip.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 4f01f89..7e4d740 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -198,7 +198,6 @@ struct rockchip_spi {
 	struct sg_table rx_sg;
 	struct rockchip_spi_dma_data dma_rx;
 	struct rockchip_spi_dma_data dma_tx;
-	struct dma_slave_caps dma_caps;
 };

 static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
@@ -447,10 +446,7 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
 		rxconf.direction = rs->dma_rx.direction;
 		rxconf.src_addr = rs->dma_rx.addr;
 		rxconf.src_addr_width = rs->n_bytes;
-		if (rs->dma_caps.max_burst > 4)
-			rxconf.src_maxburst = 4;
-		else
-			rxconf.src_maxburst = 1;
+		rxconf.src_maxburst = rs->n_bytes;
 		dmaengine_slave_config(rs->dma_rx.ch, &rxconf);

 		rxdesc = dmaengine_prep_slave_sg(
@@ -466,10 +462,7 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
 		txconf.direction = rs->dma_tx.direction;
 		txconf.dst_addr = rs->dma_tx.addr;
 		txconf.dst_addr_width = rs->n_bytes;
-		if (rs->dma_caps.max_burst > 4)
-			txconf.dst_maxburst = 4;
-		else
-			txconf.dst_maxburst = 1;
+		txconf.dst_maxburst = rs->n_bytes;
 		dmaengine_slave_config(rs->dma_tx.ch, &txconf);

 		txdesc = dmaengine_prep_slave_sg(
@@ -713,7 +706,6 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	}

 	if (rs->dma_tx.ch && rs->dma_rx.ch) {
-		dma_get_slave_caps(rs->dma_rx.ch, &(rs->dma_caps));
 		rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
 		rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
 		rs->dma_tx.direction = DMA_MEM_TO_DEV;
--
2.7.4