pistachio: remove kernel 4.9 support

[openwrt/openwrt.git] / target / linux / pistachio / patches-4.9 / 105-spi-img-spfi-RX-maximum-burst-size-for-DMA-is-8.patch

diff --git a/target/linux/pistachio/patches-4.9/105-spi-img-spfi-RX-maximum-burst-size-for-DMA-is-8.patch b/target/linux/pistachio/patches-4.9/105-spi-img-spfi-RX-maximum-burst-size-for-DMA-is-8.patch
deleted file mode 100644 (file)
index 0067b0e..0000000
--- a/target/linux/pistachio/patches-4.9/105-spi-img-spfi-RX-maximum-burst-size-for-DMA-is-8.patch
+++ /dev/null
@@ -1,59 +0,0 @@
-From 56466f505f58f44b69feb7eaed3b506842800456 Mon Sep 17 00:00:00 2001
-From: Ionela Voinescu <ionela.voinescu@imgtec.com>
-Date: Tue, 1 Mar 2016 17:49:45 +0000
-Subject: spi: img-spfi: RX maximum burst size for DMA is 8
-
-The depth of the FIFOs is 16 bytes. The DMA request line is tied
-to the half full/empty (depending on the use of the TX or RX FIFO)
-threshold. For the TX FIFO, if you set a burst size of 8 (equal to
-half the depth) the first burst goes into FIFO without any issues,
-but due the latency involved (the time the data leaves  the DMA
-engine to the time it arrives at the FIFO), the DMA might trigger
-another burst of 8. But given that there is no space for 2 additonal
-bursts of 8, this would result in a failure. Therefore, we have to
-keep the burst size for TX to 4 to accomodate for an extra burst.
-
-For the read (RX) scenario, the DMA request line goes high when
-there is at least 8 entries in the FIFO (half full), and we can
-program the burst size to be 8 because the risk of accidental burst
-does not exist. The DMA engine will not trigger another read until
-the read data for all the burst it has sent out has been received.
-
-While here, move the burst size setting outside of the if/else branches
-as they have the same value for both 8 and 32 bit data widths.
-
-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
----
- drivers/spi/spi-img-spfi.c | 6 ++----
- 1 file changed, 2 insertions(+), 4 deletions(-)
-
---- a/drivers/spi/spi-img-spfi.c
-+++ b/drivers/spi/spi-img-spfi.c
-@@ -346,12 +346,11 @@ static int img_spfi_start_dma(struct spi
-               if (xfer->len % 4 == 0) {
-                       rxconf.src_addr = spfi->phys + SPFI_RX_32BIT_VALID_DATA;
-                       rxconf.src_addr_width = 4;
--                      rxconf.src_maxburst = 4;
-               } else {
-                       rxconf.src_addr = spfi->phys + SPFI_RX_8BIT_VALID_DATA;
-                       rxconf.src_addr_width = 1;
--                      rxconf.src_maxburst = 4;
-               }
-+              rxconf.src_maxburst = 8;
-               dmaengine_slave_config(spfi->rx_ch, &rxconf);
- 
-               rxdesc = dmaengine_prep_slave_sg(spfi->rx_ch, xfer->rx_sg.sgl,
-@@ -370,12 +369,11 @@ static int img_spfi_start_dma(struct spi
-               if (xfer->len % 4 == 0) {
-                       txconf.dst_addr = spfi->phys + SPFI_TX_32BIT_VALID_DATA;
-                       txconf.dst_addr_width = 4;
--                      txconf.dst_maxburst = 4;
-               } else {
-                       txconf.dst_addr = spfi->phys + SPFI_TX_8BIT_VALID_DATA;
-                       txconf.dst_addr_width = 1;
--                      txconf.dst_maxburst = 4;
-               }
-+              txconf.dst_maxburst = 4;
-               dmaengine_slave_config(spfi->tx_ch, &txconf);
- 
-               txdesc = dmaengine_prep_slave_sg(spfi->tx_ch, xfer->tx_sg.sgl,