Re: [Intel-gfx] [PATCH 1/8] drm/i915/sdvo: Filter out invalid outputs more sensibly

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

On Wed, 26 Oct 2022, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> We try to filter out the corresponding xxx1 output
> if the xxx0 output is not present. But the way that is
> being done is pretty awkward. Make it less so.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_sdvo.c | 29 ++++++++++++++++++-----
>  1 file changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
> index cf8e80936d8e..c6200a91a777 100644
> --- a/drivers/gpu/drm/i915/display/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
> @@ -2925,16 +2925,33 @@ intel_sdvo_lvds_init(struct intel_sdvo *intel_sdvo, int device)
>  	return false;
>  }
>  
> -static bool
> -intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
> +static u16 intel_sdvo_filter_output_flags(u16 flags)
>  {
> +	flags &= SDVO_OUTPUT_MASK;
> +
>  	/* SDVO requires XXX1 function may not exist unless it has XXX0 function.*/
> +	if (!(flags & SDVO_OUTPUT_TMDS0))
> +		flags &= ~SDVO_OUTPUT_TMDS1;
> +
> +	if (!(flags & SDVO_OUTPUT_RGB0))
> +		flags &= ~SDVO_OUTPUT_RGB1;
> +
> +	if (!(flags & SDVO_OUTPUT_LVDS0))
> +		flags &= ~SDVO_OUTPUT_LVDS1;
> +
> +	return flags;
> +}
> +
> +static bool
> +intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
> +{
> +	flags = intel_sdvo_filter_output_flags(flags);
>  
>  	if (flags & SDVO_OUTPUT_TMDS0)
>  		if (!intel_sdvo_dvi_init(intel_sdvo, 0))
>  			return false;
>  
> -	if ((flags & SDVO_TMDS_MASK) == SDVO_TMDS_MASK)
> +	if (flags & SDVO_OUTPUT_TMDS1)
>  		if (!intel_sdvo_dvi_init(intel_sdvo, 1))
>  			return false;
>  
> @@ -2955,7 +2972,7 @@ intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
>  		if (!intel_sdvo_analog_init(intel_sdvo, 0))
>  			return false;
>  
> -	if ((flags & SDVO_RGB_MASK) == SDVO_RGB_MASK)
> +	if (flags & SDVO_OUTPUT_RGB1)
>  		if (!intel_sdvo_analog_init(intel_sdvo, 1))
>  			return false;
>  
> @@ -2963,11 +2980,11 @@ intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
>  		if (!intel_sdvo_lvds_init(intel_sdvo, 0))
>  			return false;
>  
> -	if ((flags & SDVO_LVDS_MASK) == SDVO_LVDS_MASK)
> +	if (flags & SDVO_OUTPUT_LVDS1)
>  		if (!intel_sdvo_lvds_init(intel_sdvo, 1))
>  			return false;
>  
> -	if ((flags & SDVO_OUTPUT_MASK) == 0) {
> +	if (flags == 0) {
>  		unsigned char bytes[2];
>  
>  		intel_sdvo->controlled_output = 0;

-- 
Jani Nikula, Intel Open Source Graphics Center