On Tue, May 25, 2010 at 8:07 PM, Ghorai, Sukumar <s-ghorai@xxxxxx> wrote: [...] >> > c. And how to know that ECC engine is in used other driver should not >> use it? Any bit to know that ecc engine is busy, as we check for prefetch? >> Do not really remember config registers. Perhaps there is no way. >> But I guess you should check into register GPMC_ECC_CONFIG at bit 1. >> This is the bit we are setting to enable ECC calculation, IIRC. > [Ghorai] there are two functions - > info->nand.ecc.calculate = omap_calculate_ecc; > info->nand.ecc.hwctl = omap_enable_hwecc; > And GPMC_ECC_CONFIG register.. > 3:1 ECCCS Selects the CS where ECC is computed > 0 ECCENABLE Enables the ECC feature > Now we enable omap_enable_hwecc (with GPMC_ECC_CONFIG[ECCENABLE]=1); and its get disabled (automatically) when ecc_size data transfer over. > But say still it did not read the ecc value yet (omap_calculate_ecc). > So how to protect following omap_enable_hwecc() before omap_calculate_ecc() without additional flag? Any input is welcome. Oh yes, that's is a problem. Perhaps in that case you have to protect it in very much same way you already did. -- Regards, Vimal Singh -- 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
