[Intel-gfx] [PATCH 2/8] drm/i915/dsi: don't pass arbitrary data to sideband

[Ville Syrjälä]

On Thu, Feb 04, 2016 at 12:50:50PM +0200, Jani Nikula wrote:
> Since sequence block v2 the second byte contains flags other than just
> pull up/down. Don't pass arbitrary data to the sideband interface.
> 
> The rest may or may not work for sequence block v2, but there should be
> no harm done.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

well, as far as it can be reviewed with the crappy specs.

> ---
>  drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> index 4775aa5462e8..6f013efba45b 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> @@ -207,7 +207,7 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
>  	gpio = *data++;
>  
>  	/* pull up/down */
> -	action = *data++;
> +	action = *data++ & 1;
>  
>  	if (gpio >= ARRAY_SIZE(gtable)) {
>  		DRM_DEBUG_KMS("unknown gpio %u\n", gpio);
> -- 
> 2.1.4
> 
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-- 
Ville Syrjälä
Intel OTC