[PATCH 04/10] dmaengine: sun6i: Enable additional burst lengths/widths on H3
From: Stefan Brüns <hidden>
Date: 2017-09-03 22:42:47
Also in:
linux-arm-kernel, lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
The H3 supports bursts lengths of 1, 4, 8 and 16 transfers, each with a width of 1, 2, 4 or 8 bytes. The register value for the the width is log2-encoded, change the conversion function to provide the correct value for width == 8. Signed-off-by: Stefan Brüns <redacted> --- drivers/dma/sun6i-dma.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index c5644bd0f91a..335a8ec88b0b 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c@@ -263,8 +263,12 @@ static inline s8 convert_burst(u32 maxburst) switch (maxburst) { case 1: return 0; + case 4: + return 1; case 8: return 2; + case 16: + return 3; default: return -EINVAL; }
@@ -272,7 +276,7 @@ static inline s8 convert_burst(u32 maxburst) static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width) { - return addr_width >> 1; + return ilog2(addr_width); } static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
@@ -1152,6 +1156,12 @@ static int sun6i_dma_probe(struct platform_device *pdev) BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); sdc->src_burst_lengths = BIT(1) | BIT(8); sdc->dst_burst_lengths = BIT(1) | BIT(8); + if (sdc->cfg->dmac_variant == DMAC_VARIANT_H3) { + sdc->slave.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); + sdc->slave.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); + sdc->src_burst_lengths |= BIT(4) | BIT(16); + sdc->dst_burst_lengths |= BIT(4) | BIT(16); + } sdc->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
--
2.14.1
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