Hi Geert.
I'd like to ask you about R-Car Gen2 QSPI driver performance test of
single, dual and quad.
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commit 4f12b5e529e4ff274eb478ec1c2ef41358ed9577
Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Date: Mon Jun 2 15:38:17 2014 +0200
spi: rspi: Add DMA support for QSPI on R-Car Gen2
Enable DMA support for QSPI on R-Car Gen2, for Single, Dual, and
Quad SPI
Transfers.
Performance figures for reading from a QSPI FLASH driven at 24.375
MHz
on r8a7791/koelsch:
- Single: 1.1 Mbps PIO, 23 Mbps DMA
- Dual : 12.7 Mbps PIO, 48 Mbps DMA
- Quad : 13 Mbps PIO, 70 Mbps DMA
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Could you show me how to test these performances?
I have tried to reproduce them but I only got the results like this:
Enabled DMA:
Linux stable v4.7
Quad-spi： Read 3.2 MB/s Write 601 kB/s
Dual-spi： Read 3.1 MB/s Write 847 kB/s
Single-spi： Read 2.5 MB/s Write 850 kB/s
PIO:
RcarGen2_BSP linux_v3.10.101-ltsi
Quad-spi： Read 2.2 MB/s Write 1.1 MB/s
Dual-spi： Read 2.1 MB/s Write 158 kB/s
Single-spi： Read 173 kB/s Write 159 kB/s
Regards,
Jinso/Hiep.
