[Intel-gfx] [PATCH] drm/i915: Don't read dpcd for disconnected ports

[Jani Nikula]

On Tue, 21 Apr 2015, Mika Kuoppala <mika.kuoppala at linux.intel.com> wrote:
> Reading from disconnected ports will spit out timeout error
> on the dmesg. Skip the attempted read if the port is not
> connected and avoid confusing users/testcases about
> expected timeouts.
>
> This new dpcd debugfs entry was introduced by commit aa7471d228eb
> ("drm/i915: add i915 specific connector debugfs file for DPCD")
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90060
> Tested-by: yex.tian at intel.com
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Bob Paauwe <bob.j.paauwe at intel.com>
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 9c2b9e4..fbc1f39 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4938,6 +4938,9 @@ static int i915_dpcd_show(struct seq_file *m, void *data)
>  		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
>  			continue;
>  
> +		if (connector->status != connector_status_connected)
> +			continue;

The loop isn't iterating over connectors, so this check should be at the
top of the function.

BR,
Jani.


> +
>  		/* low tech for now */
>  		if (WARN_ON(size > sizeof(buf)))
>  			continue;
> -- 
> 1.9.1
>
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-- 
Jani Nikula, Intel Open Source Technology Center