imx6 SPI - Master Mode with Wait States

[viniciusmaciel]

Hi,

I did a little modification in spi-imx driver to insert 0 wait states in SCLK between data, but it is not working! I am using an imx6 wandboard board with kernel 4.9.11.

/* 0 wait states inserted */
 reg = readl(spi_imx->base + MX51_ECSPI_PERIOD);
 reg &= ~(MX51_ECSPI_PERIOD_MASK); // MASK=0x7FFF
 writel(reg, spi_imx->base + MX51_ECSPI_PERIOD);‍‍‍‍

There is still a 2.2uS delay.

[igorpadykov]

Hi Vinicuis

one can try to use larger burst lengths using the BURST_LENGTH
setting in register ECSPIx_CONREG and spi native chip select patch:

[2/2] spi: imx: fix use of native chip-selects with devicetree - Patchwork 

Best regards
igor
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