[U-Boot] [PATCH v2 1/2] mtd: OMAP: Enable GPMC prefetch mode

[Daniel Mack]

Hi Guido,

thanks for your feedback!

On 12/19/2014 05:27 PM, Guido Martínez wrote:
>> +/**
>> + * omap_prefetch_enable - configures and starts prefetch transfer
>> + * @fifo_th: fifo threshold to be used for read/ write
>> + * @count: number of bytes to be transferred
>> + * @is_write: prefetch read(0) or write post(1) mode
>> + */
>> +static int omap_prefetch_enable(int fifo_th, unsigned int count, int is_write)
>> +{
>> +	uint32_t val;
>> +
>> +	if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
>> +		return -EINVAL;
>> +
>> +	if (readl(&gpmc_cfg->prefetch_control))
>> +		return -EBUSY;
>> +
>> +	/* Set the amount of bytes to be prefetched */
>> +	writel(count, &gpmc_cfg->prefetch_config2);
>> +
>> +	val = (cs << PREFETCH_CONFIG1_CS_SHIFT) | (is_write & 1) |
> On a current U-boot "cs" doesn't exist. I think you might want to pass a
> "struct omap_nand_info *" and use info->cs.
> 
> I fixed this last bit, and tested it. It results in 2.5x speed
> improvements on a Micron NAND. So, thanks :) !
> 
> If you resend, you have my Reviewed-by and Tested-by.

That's great to hear. However, I'm not currently working on this
project, so I don't have a chance to respin the patch. In case any of
the maintainers is interested, I guess that's easy enough to tweak on
the fly when merging the patch :)


Thanks,
Daniel