[PATCH] ARM: stm32mp: ddrctl: add STM32MP131 RAM size querying support

[Sascha Hauer]

On Wed, Feb 23, 2022 at 12:38:47PM +0100, Ahmad Fatoum wrote:
> buswidth is read from HW. With nb_bytes == 2, there is a possibility
> that we get a zero size out here, if driver and device are
> mismatched, e.g. because barebox is booted in FIP with mismatched
> external device tree.
> 
> As this runs very early before relocation, round up instead of crashing
> to be a bit more on the safe side.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  arch/arm/mach-stm32mp/ddrctrl.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/mach-stm32mp/ddrctrl.c b/arch/arm/mach-stm32mp/ddrctrl.c
> index 7f0944d7e77c..ed211cf58ebc 100644
> --- a/arch/arm/mach-stm32mp/ddrctrl.c
> +++ b/arch/arm/mach-stm32mp/ddrctrl.c
> @@ -101,7 +101,8 @@ static unsigned long ddrctrl_addrmap_ramsize(struct stm32mp1_ddrctl __iomem *d,
>  	if (LINE_UNUSED(reg, ADDRMAP6_ROW_B13)) rows--;
>  	if (LINE_UNUSED(reg, ADDRMAP6_ROW_B12)) rows--;
>  
> -	return memory_sdram_size(cols, rows, BIT(banks), nb_bytes / BIT(buswidth));
> +	return memory_sdram_size(cols, rows, BIT(banks),
> +				 DIV_ROUND_UP(nb_bytes, BIT(buswidth)));
>  }
>  
>  static inline unsigned ddrctrl_ramsize(void __iomem *base, unsigned nb_bytes)
> -- 
> 2.30.2
> 
> 
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