Re: [Intel-gfx] [PATCH v2] drm/i915/display: split DISPLAY_VER 9 and 10 in intel_setup_outputs()

[Matt Roper <matthew.d.roper@intel.com>]

On Thu, Jul 22, 2021 at 04:29:22PM -0700, Lucas De Marchi wrote:
> Commit 5a9d38b20a5a ("drm/i915/display: hide workaround for broken vbt
> in intel_bios.c") moved the workaround for broken or missing VBT to
> intel_bios.c. However is_port_valid() only protects the handling of
> different skus of the same display version. Since in
> intel_setup_outputs() we share the code path with version 9, this would
> also create port F for SKL/KBL, which does not exist.
> 
> Missing VBT can be reproduced when starting a headless QEMU with no
> opregion available.
> 
> Avoid the issue by splitting versions 9 and 10 in intel_setup_outputs(),
> which also makes it more clear what code path it's taking for each
> version.

Or we could just drop the PORT_F line.  We've slowly been dropping bits
and pieces of CNL support from the driver for a while now since all the
hardware that came out had fused off graphics/display; that leaves GLK
as the only real platform with display version 10, and it's already
handled in its own condition branch above.


Matt

> 
> v2: move generic display version after Geminilake since that one has
> a different set of outputs
> 
> Fixes: 5a9d38b20a5a ("drm/i915/display: hide workaround for broken vbt in intel_bios.c")
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Reported-by: Christoph Hellwig <hch@infradead.org>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index c274bfb8e549..3f5383f3c744 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11376,13 +11376,19 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
>  		intel_ddi_init(dev_priv, PORT_B);
>  		intel_ddi_init(dev_priv, PORT_C);
>  		vlv_dsi_init(dev_priv);
> -	} else if (DISPLAY_VER(dev_priv) >= 9) {
> +	} else if (DISPLAY_VER(dev_priv) == 10) {
>  		intel_ddi_init(dev_priv, PORT_A);
>  		intel_ddi_init(dev_priv, PORT_B);
>  		intel_ddi_init(dev_priv, PORT_C);
>  		intel_ddi_init(dev_priv, PORT_D);
>  		intel_ddi_init(dev_priv, PORT_E);
>  		intel_ddi_init(dev_priv, PORT_F);
> +	} else if (DISPLAY_VER(dev_priv) >= 9) {
> +		intel_ddi_init(dev_priv, PORT_A);
> +		intel_ddi_init(dev_priv, PORT_B);
> +		intel_ddi_init(dev_priv, PORT_C);
> +		intel_ddi_init(dev_priv, PORT_D);
> +		intel_ddi_init(dev_priv, PORT_E);
>  	} else if (HAS_DDI(dev_priv)) {
>  		u32 found;
>  
> -- 
> 2.31.1
> 
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-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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