Subject: [PATCH] ARM: OMAP2+: Fix onenand initialization to avoid filesystem corruption

From: [email-masked] (Tony Lindgren)
Date: Mon, 8 Feb 2016 11:36:45 -0800

* Ivaylo Dimitrov <[email-masked]> [160205 06:38]:
> Commit <e7b11dc7b77bfce0a351230a5feeadc1d0bba997> ("ARM: OMAP2+: Fix
> onenand rate detection to avoid filesystem corruption") partially fixed
> onenand configuration when GPMC module is reset. Finish the job by also
> providing the correct values in ONENAND_REG_SYS_CFG1 register.

OK. So probably the INT or RDY polarity made the ECC not work.

Aaro, care to dump out also the nolo configured CFG1 value from
n8x0 and n9(50)?

You can do it by adding something like this to the beginning
of set_onenand_cfg():

pr_info("CFG1: 0x%04x\n", readw(onenand_base + ONENAND_REG_SYS_CFG1));

And presumably the values are the same as on n900. If not, we
should do the legacy file system flash test on all of them
before committing this fix.

Regards,

Tony

> Signed-off-by: Ivaylo Dimitrov <[email-masked]>
> ---
>  arch/arm/mach-omap2/gpmc-onenand.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
> index 7b76ce0..8633c70 100644
> --- a/arch/arm/mach-omap2/gpmc-onenand.c
> +++ b/arch/arm/mach-omap2/gpmc-onenand.c
> @@ -101,10 +101,8 @@ static void omap2_onenand_set_async_mode(void __iomem *onenand_base)
>  
>  static void set_onenand_cfg(void __iomem *onenand_base)
>  {
> -	u32 reg;
> +	u32 reg = ONENAND_SYS_CFG1_RDY | ONENAND_SYS_CFG1_INT;
>  
> -	reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
> -	reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9));
>  	reg |=	(latency << ONENAND_SYS_CFG1_BRL_SHIFT) |
>  		ONENAND_SYS_CFG1_BL_16;
>  	if (onenand_flags & ONENAND_FLAG_SYNCREAD)
> @@ -123,6 +121,7 @@ static void set_onenand_cfg(void __iomem *onenand_base)
>  		reg |= ONENAND_SYS_CFG1_VHF;
>  	else
>  		reg &= ~ONENAND_SYS_CFG1_VHF;
> +
>  	writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
>  }
>  
> @@ -289,6 +288,7 @@ static int omap2_onenand_setup_async(void __iomem *onenand_base)
>  		}
>  	}
>  
> +	onenand_async.sync_write = true;
>  	omap2_onenand_calc_async_timings(&t);
>  
>  	ret = gpmc_cs_program_settings(gpmc_onenand_data->cs, &onenand_async);
> -- 
> 1.9.1
>