The new V3U SoC needs handling of spurious interrupts which is handled in patch #4. However, this extra check is bad for Gen2 and earlier SoCs, so we need seperate interrupts now. While working on this, further improvements to avoid the HW race condition on Gen2 and earlier have been found, see patches 1-3. My measurements have shown that patches 1+2 really improve the situation. Before, I could see doubled messages after adding 2us of delay to the interrupt handler. After, they only started to appear after 7us. I can't say much about the spurious interrupts on V3U. The BSP team experienced them, I did not so far. Let me know what you think... Wolfram Sang (4): i2c: rcar: faster irq code to minimize HW race condition i2c: rcar: optimize cacheline to minimize HW race condition i2c: rcar: make sure irq is not threaded on Gen2 and earlier i2c: rcar: protect against supurious interrupts on V3U drivers/i2c/busses/i2c-rcar.c | 66 +++++++++++++++++++++++++---------- 1 file changed, 48 insertions(+), 18 deletions(-) -- 2.28.0
