Re: [PATCH 5/7] drm/i915: add _PICK macro for the "a + index * (b - a)" macros

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 13 Jun 2017, Paulo Zanoni <paulo.r.zanoni@intel.com> wrote:
> Instead of duplicating the macro everywhere, add a single definition
> for it and call it just like we do with the _PICK3 macros.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index d271098..3e46ba1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -48,25 +48,26 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>  	return !i915_mmio_reg_equal(reg, INVALID_MMIO_REG);
>  }
>  
> +#define _PICK(__index, a, b) ((a) + (__index) * ((b) - (a)))

The change overall is good but I'd name this in a way that emphasizes
the registers are evenly spaced. _LINEAR?

BR,
Jani.

>  #define _PICK3(__index, ...) (((const u32 []){ __VA_ARGS__ })[__index])
>  
> -#define _PIPE(pipe, a, b) ((a) + (pipe)*((b)-(a)))
> +#define _PIPE(pipe, a, b) _PICK(pipe, a, b)
>  #define _MMIO_PIPE(pipe, a, b) _MMIO(_PIPE(pipe, a, b))
>  #define _MMIO_PIPE3(pipe, ...) _MMIO(_PICK3(pipe, __VA_ARGS__))
>  
> -#define _PLANE(plane, a, b) _PIPE(plane, a, b)
> -#define _MMIO_PLANE(plane, a, b) _MMIO_PIPE(plane, a, b)
> +#define _PLANE(plane, a, b) _PICK(plane, a, b)
> +#define _MMIO_PLANE(plane, a, b) _MMIO(_PLANE(plane, a, b))
>  
> -#define _TRANS(tran, a, b) ((a) + (tran)*((b)-(a)))
> +#define _TRANS(tran, a, b) _PICK(tran, a, b)
>  #define _MMIO_TRANS(tran, a, b) _MMIO(_TRANS(tran, a, b))
>  
> -#define _PORT(port, a, b) ((a) + (port)*((b)-(a)))
> +#define _PORT(port, a, b) _PICK(port, a, b)
>  #define _MMIO_PORT(port, a, b) _MMIO(_PORT(port, a, b))
>  #define _MMIO_PORT3(port, ...) _MMIO(_PICK3(port, __VA_ARGS__))
>  #define _MMIO_PORT3_LN(port, ln, a0, a1, b, c, d, e, f)			\
>  	_MMIO(_PICK3(port, a0, b, c, d, e, f) + (ln * (a1 - a0)))
>  
> -#define _PLL(pll, a, b) ((a) + (pll)*((b)-(a)))
> +#define _PLL(pll, a, b) _PICK(pll, a, b)
>  #define _MMIO_PLL(pll, a, b) _MMIO(_PLL(pll, a, b))
>  
>  #define _PHY3(phy, ...) _PICK3(phy, __VA_ARGS__)
> @@ -6415,7 +6416,7 @@ enum {
>  #define _PS_ECC_STAT_2B     0x68AD0
>  #define _PS_ECC_STAT_1C     0x691D0
>  
> -#define _ID(id, a, b) ((a) + (id)*((b)-(a)))
> +#define _ID(id, a, b) _PICK(id, a, b)
>  #define SKL_PS_CTRL(pipe, id) _MMIO_PIPE(pipe,        \
>  			_ID(id, _PS_1A_CTRL, _PS_2A_CTRL),       \
>  			_ID(id, _PS_1B_CTRL, _PS_2B_CTRL))

-- 
Jani Nikula, Intel Open Source Technology Center
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