Hi Roger, I'm not too familiar with OMAP platforms, and I might have missed out on prior discussions/context, so please forgive if I'm asking silly or old questions here. On Fri, Sep 18, 2015 at 05:53:22PM +0300, Roger Quadros wrote: > - Remove NAND IRQ handling from omap-gpmc driver, share the GPMC IRQ > with the omap2-nand driver and handle NAND IRQ events in the NAND driver. > This causes performance increase when using prefetch-irq mode. > 30% increase in read, 17% increase in write in prefetch-irq mode. Have you pinpointed the exact causes for the performance increase, or can you give an educated guess? AIUI, you're reducing the number of interrupts needed for NAND prefetch mode, but you're also removing a bit of abstraction and implementing hooks that look awfully like the existing abstractions: + int (*nand_irq_enable)(enum gpmc_nand_irq irq); + int (*nand_irq_disable)(enum gpmc_nand_irq irq); + void (*nand_irq_clear)(enum gpmc_nand_irq irq); + u32 (*nand_irq_status)(void); That's not really a problem if there's a good reason for them (brcmnand implements similar hooks because of quirks in the implementation of interrupts across various BRCM SoCs, and it's not worth writing irqchip drivers for those cases). I'm mainly curious for an explanation. Regards, Brian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
