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stm32f7:DMA Do not disqualify DMA capability based on cache alignment

This commit is contained in:
David Sidrane 2020-09-08 12:50:17 -07:00 committed by Alin Jerpelea
parent 2cfb239a87
commit 2d9e0f6a76
2 changed files with 14 additions and 1 deletions
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11
arch/arm/src/stm32f7/Kconfig
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@ -2634,6 +2634,17 @@ config STM32F7_DMACAPABLE
Drivers then may use this information to determine if they should
attempt the DMA or fall back to a different transfer method.
config STM32F7_DMACAPABLE_ASSUME_CACHE_ALIGNED
bool "Do not disqualify DMA capability based on cache alignment"
depends on STM32F7_DMACAPABLE && ARMV7M_DCACHE && !ARMV7M_DCACHE_WRITETHROUGH
default n
---help---
This option configures the stm32_dmacapable to not disqualify
DMA operations on memory that is not dcache aligned based solely
on the starting addresss and byte count.
Use this when ALL buffer extents are known to be aligned, but the
the count does not use the complete buffer.
menu "Timer Configuration"
if SCHED_TICKLESS

4
arch/arm/src/stm32f7/stm32_dma.c
View File

@ -933,10 +933,12 @@ bool stm32_dmacapable(uint32_t maddr, uint32_t count, uint32_t ccr)
if ((maddr & (ARMV7M_DCACHE_LINESIZE - 1)) != 0 ||
((mend + 1) & (ARMV7M_DCACHE_LINESIZE - 1)) != 0)
{
dmainfo("stm32_dmacapable:"
dmawarn("stm32_dmacapable:"
" dcache unaligned maddr:0x%08x mend:0x%08x\n",
maddr, mend);
#if !defined(CONFIG_STM32F7_DMACAPABLE_ASSUME_CACHE_ALIGNED)
return false;
#endif
}
# endif