raised ZYNQMP_DMA_NUM_DESCS from 32 to 10000 and replace spin_lock_bh with spin_lock_irqsave #1
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raise ZYNQMP_DMA_NUM_DESCS from 32 to 10000 to enhance the max dma transfers from ~64KB to ~20MB
Why 10000? Because it is enough for a dma copy of a 2448x2048 ARGB image with 4KB pages!
replace spin_lock_bh with spin_lock_irqsave:
All device_prep_dma_* functions and device_issue_pending can be called
from an interrupt context. As this includes hard IRQs, we must use
spin_lock_irqsave() instead of spin_lock_bh() to access chan->lock.