| Message ID | 20170903224100.17893-5-stefan.bruens@rwth-aachen.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Sep 04, 2017 at 12:40:55AM +0200, Stefan Brüns wrote: > 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 <stefan.bruens@rwth-aachen.de> > --- > 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); > + } The rest looks good, but that should be stored in the sun6i_dma_config structure too. Thanks! Maxime
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;
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 <stefan.bruens@rwth-aachen.de> --- drivers/dma/sun6i-dma.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)