Le lun. 9 juil. 2018 à 19:14, Vinod <vk...@kernel.org> a écrit :
On 03-07-18, 14:32, Paul Cercueil wrote:
The JZ4725B has one DMA core starring six DMA channels.
As for the JZ4770, each DMA channel's clock can be enabled with
a register write, the difference here being that once started, it
is not possible to turn it off.
ok so disable for this, right..
@@ -204,6 +205,8 @@ static inline void
jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
{
if (jzdma->version == ID_JZ4770)
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKES, BIT(chn));
+ else if (jzdma->version == ID_JZ4725B)
+ jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKE, BIT(chn));
but you are writing to a different register here..
Yes. SoCs >= JZ4770 have the DCKE read-only register, and DCKES/DCKEC
to set/clear bits in DCKE.
On JZ4725B, DCKE is read/write, but the zeros written are ignored (at
least that's what the
documentation says).
--
~Vinod
Thanks,
-Paul
