Re: [PATCH 3/4] memory: jz4780-nemc: Reduce size of const array

[Paul Cercueil <paul@xxxxxxxxxxxxxxx>]

Hi,

On Fri, Jan 18, 2019 at 5:15 AM, Boris Brezillon 
<bbrezillon@xxxxxxxxxx> wrote:
> On Thu, 17 Jan 2019 19:45:49 -0300
> Paul Cercueil <paul@xxxxxxxxxxxxxxx <mailto:paul@xxxxxxxxxxxxxxx>> 
> wrote:
>
> >  The maximum value found in that array is 15, there's no need to 
> > store
> >  these values as uint32_t, a uint8_t is enough.
>
> Is it really worth the additional cast you add in the code?

They're not needed. I had to verify, because it was not obvious to me.
I'll remove them then.

> >  Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx 
> > <mailto:paul@xxxxxxxxxxxxxxx>>
> >  ---
> >   drivers/memory/jz4780-nemc.c | 6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> >
> >  diff --git a/drivers/memory/jz4780-nemc.c 
> > b/drivers/memory/jz4780-nemc.c
> >  index bcf06adefc96..ef3f20e46590 100644
> >  --- a/drivers/memory/jz4780-nemc.c
> >  +++ b/drivers/memory/jz4780-nemc.c
> >  @@ -161,7 +161,7 @@ static bool jz4780_nemc_configure_bank(struct 
> > jz4780_nemc *nemc,
> >   	 * Conversion of tBP and tAW cycle counts to values supported by 
> > the
> >   	 * hardware (round up to the next supported value).
> >   	 */
> >  -	static const uint32_t convert_tBP_tAW[] = {
> >  +	static const u8 convert_tBP_tAW[] = {
> >   		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
> >
> >   		/* 11 - 12 -> 12 cycles */
> >  @@ -232,7 +232,7 @@ static bool jz4780_nemc_configure_bank(struct 
> > jz4780_nemc *nemc,
> >   			return false;
> >   		}
> >
> >  -		smcr |= convert_tBP_tAW[cycles] << NEMC_SMCR_TBP_SHIFT;
> >  +		smcr |= (u32)convert_tBP_tAW[cycles] << NEMC_SMCR_TBP_SHIFT;
> >   	}
> >
> >   	if (of_property_read_u32(node, "ingenic,nemc-tAW", &val) == 0) {
> >  @@ -244,7 +244,7 @@ static bool jz4780_nemc_configure_bank(struct 
> > jz4780_nemc *nemc,
> >   			return false;
> >   		}
> >
> >  -		smcr |= convert_tBP_tAW[cycles] << NEMC_SMCR_TAW_SHIFT;
> >  +		smcr |= (u32)convert_tBP_tAW[cycles] << NEMC_SMCR_TAW_SHIFT;
> >   	}
> >
> >   	if (of_property_read_u32(node, "ingenic,nemc-tSTRV", &val) == 0) {