This patch is based on kernel/git/next/linux-next.git/#master and for enableing cache in SCP. In mt8186 SCP, it provides parts of these features vedio encode/decode, camera, and CrOS EC host command. We don't have enough SRAM to support too many text segments, heap and stack, so SCP will use DRAM as execution space.· The DRAM power and latency is much larger than SRAM. cache is used to mitigate the negative effects for performace. Also it's designed in SCP bus architecture and does not affect implemenations where the application processor is using caches. We reserve 0x3C000 <-> 0x40000 in SRAM(SCP) to support cache and set I-cache and D-cache size before loading SCP FW. If there isn't no this patch, SCP still works with DRAM and SRAM. This driver was tested on mt8186 with below firmware This driver was tested on mt8186 with below firmware https://lore.kernel.org/linux-firmware/10ed0b2a78baa88f7fd1d466036c98de2f6d8e29.camel@xxxxxxxxxxxx/T/#t changes since v1: - rebase to linux-next - add more information in commit message Allen-KH Cheng (1): remoteproc: mediatek: enable cache for mt8186 SCP drivers/remoteproc/mtk_scp.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) -- 2.18.0
