[Intel-gfx] [PATCH 08/37] drm/i915: make intel_{uncore, de}_rmw() more useful

[Souza, Jose]

On Wed, 2020-05-20 at 17:37 -0700, Lucas De Marchi wrote:
> Return the old value read so some places of the code can still do the
> rmw but add warnings/errors about the value it read.
> 
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_de.h |  4 ++--
>  drivers/gpu/drm/i915/intel_uncore.h     | 10 +++++++---
>  2 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_de.h b/drivers/gpu/drm/i915/display/intel_de.h
> index 00da10bf35f5..d5441b1ba2fe 100644
> --- a/drivers/gpu/drm/i915/display/intel_de.h
> +++ b/drivers/gpu/drm/i915/display/intel_de.h
> @@ -42,10 +42,10 @@ intel_de_write_fw(struct drm_i915_private *i915, i915_reg_t reg, u32 val)
>  	intel_uncore_write_fw(&i915->uncore, reg, val);
>  }
> 

Maybe add function documentation with this new information about the return?

With that:

Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

>  
> -static inline void
> +static inline u32
>  intel_de_rmw(struct drm_i915_private *i915, i915_reg_t reg, u32 clear, u32 set)
>  {
> -	intel_uncore_rmw(&i915->uncore, reg, clear, set);
> +	return intel_uncore_rmw(&i915->uncore, reg, clear, set);
>  }
>  
>  static inline int
> diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h
> index 8d3aa8b9acf9..5da43b56fa11 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.h
> +++ b/drivers/gpu/drm/i915/intel_uncore.h
> @@ -379,8 +379,8 @@ intel_uncore_read64_2x32(struct intel_uncore *uncore,
>  #define intel_uncore_write64_fw(...) __raw_uncore_write64(__VA_ARGS__)
>  #define intel_uncore_posting_read_fw(...) ((void)intel_uncore_read_fw(__VA_ARGS__))
>  
> -static inline void intel_uncore_rmw(struct intel_uncore *uncore,
> -				    i915_reg_t reg, u32 clear, u32 set)
> +static inline u32 intel_uncore_rmw(struct intel_uncore *uncore,
> +				   i915_reg_t reg, u32 clear, u32 set)
>  {
>  	u32 old, val;
>  
> @@ -388,9 +388,11 @@ static inline void intel_uncore_rmw(struct intel_uncore *uncore,
>  	val = (old & ~clear) | set;
>  	if (val != old)
>  		intel_uncore_write(uncore, reg, val);
> +
> +	return old;
>  }
>  
> -static inline void intel_uncore_rmw_fw(struct intel_uncore *uncore,
> +static inline u32 intel_uncore_rmw_fw(struct intel_uncore *uncore,
>  				       i915_reg_t reg, u32 clear, u32 set)
>  {
>  	u32 old, val;
> @@ -399,6 +401,8 @@ static inline void intel_uncore_rmw_fw(struct intel_uncore *uncore,
>  	val = (old & ~clear) | set;
>  	if (val != old)
>  		intel_uncore_write_fw(uncore, reg, val);
> +
> +	return old;
>  }
>  
>  static inline int intel_uncore_write_and_verify(struct intel_uncore *uncore,