This is a note to let you know that I've just added the patch titled
spi: rockchip: modify DMA max burst to 1
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-rockchip-modify-dma-max-burst-to-1.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 80abf8880cc6e1594c11b7c417f22dde60e25312 Mon Sep 17 00:00:00 2001
From: Addy Ke <addy.ke@xxxxxxxxxxxxxx>
Date: Fri, 22 Jan 2016 19:06:52 +0800
Subject: spi: rockchip: modify DMA max burst to 1
From: Addy Ke <addy.ke@xxxxxxxxxxxxxx>
commit 80abf8880cc6e1594c11b7c417f22dde60e25312 upstream.
Generic dma controller on Rockchips' platform cannot support
DMAFLUSHP instruction which make dma to flush the req of non-aligned
or non-multiple of what we need. That will cause an unrecoverable
dma bus error. The saftest way is to set dma max burst to 1.
Signed-off-by: Addy ke <addy.ke@xxxxxxxxxxxxxx>
Fixes: 64e36824b32b06 ("spi/rockchip: add driver for Rockchip...")
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
cc: Heiko Stuebner <heiko@xxxxxxxxx>
cc: Olof Johansson <olof@xxxxxxxxx>
cc: Doug Anderson <dianders@xxxxxxxxxxxx>
cc: Sonny Rao <sonnyrao@xxxxxxxxxxxx>
Acked-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-rockchip.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -199,6 +199,7 @@ 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)
@@ -454,7 +455,10 @@ static void rockchip_spi_prepare_dma(str
rxconf.direction = rs->dma_rx.direction;
rxconf.src_addr = rs->dma_rx.addr;
rxconf.src_addr_width = rs->n_bytes;
- rxconf.src_maxburst = rs->n_bytes;
+ if (rs->dma_caps.max_burst > 4)
+ rxconf.src_maxburst = 4;
+ else
+ rxconf.src_maxburst = 1;
dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
rxdesc = dmaengine_prep_slave_sg(
@@ -471,7 +475,10 @@ static void rockchip_spi_prepare_dma(str
txconf.direction = rs->dma_tx.direction;
txconf.dst_addr = rs->dma_tx.addr;
txconf.dst_addr_width = rs->n_bytes;
- txconf.dst_maxburst = rs->n_bytes;
+ if (rs->dma_caps.max_burst > 4)
+ txconf.dst_maxburst = 4;
+ else
+ txconf.dst_maxburst = 1;
dmaengine_slave_config(rs->dma_tx.ch, &txconf);
txdesc = dmaengine_prep_slave_sg(
@@ -735,6 +742,7 @@ static int rockchip_spi_probe(struct pla
}
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;
Patches currently in stable-queue which might be from addy.ke@xxxxxxxxxxxxxx are
queue-4.4/spi-rockchip-modify-dma-max-burst-to-1.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html