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List:       qemu-arm
Subject:    Re: [Qemu-arm] [Qemu-devel] [PATCH v5 28/28] hw/block/pflash_cfi02: Reduce I/O accesses to 16-bit
From:       Alistair Francis <alistair23 () gmail ! com>
Date:       2019-06-28 23:13:57
Message-ID: CAKmqyKNTq3Sj_Fr3rvOccU2DeuZryvJL1=HhjmVWJMGWKz7OHg () mail ! gmail ! com
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On Thu, Jun 27, 2019 at 1:55 PM Philippe Mathieu-Daudé
<philmd@redhat.com> wrote:
>
> Parallel NOR flashes are limited to 16-bit bus accesses.
> Remove the 32-bit dead code.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  hw/block/pflash_cfi02.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
> index db9dc7d8fb..d1f28b02b9 100644
> --- a/hw/block/pflash_cfi02.c
> +++ b/hw/block/pflash_cfi02.c
> @@ -317,8 +317,6 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
>      boff = offset & 0xFF;
>      if (pfl->width == 2) {
>          boff = boff >> 1;
> -    } else if (pfl->width == 4) {
> -        boff = boff >> 2;
>      }
>      switch (pfl->cmd) {
>      default:
> @@ -449,8 +447,6 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
>      boff = offset;
>      if (pfl->width == 2) {
>          boff = boff >> 1;
> -    } else if (pfl->width == 4) {
> -        boff = boff >> 2;
>      }
>      /* Only the least-significant 11 bits are used in most cases. */
>      boff &= 0x7FF;
> @@ -710,6 +706,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
>  static const MemoryRegionOps pflash_cfi02_ops = {
>      .read = pflash_read,
>      .write = pflash_write,
> +    .impl.max_access_size = 2,
>      .valid.min_access_size = 1,
>      .valid.max_access_size = 4,
>      .endianness = DEVICE_NATIVE_ENDIAN,
> --
> 2.20.1
>
>


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