[Intel-gfx] [PATCH] drm/i915: Don't WARN on BDW when PCH is propperly identified.
Jani Nikula
jani.nikula at linux.intel.com
Tue Jan 20 00:51:52 PST 2015
On Mon, 19 Jan 2015, Rodrigo Vivi <rodrigo.vivi at intel.com> wrote:
> We have BDW that PCH might not be propperly identified and we force it
> to be LPT. However when we correctly identify it is LPT we
> incorrectly WARN that this isn't a Haswell. For now we have many
> platforms out there we still need to force LPT so let's keep the force
> below, but let's remove the WARN when everything is propperly
> identified.
Before this we haven't tested the BDW + non-LP LPT combination. Maybe we
should do some review of any checks against
INTEL_PCH_LPT_LP_DEVICE_ID_TYPE in BDW code. Those have always matched
before.
If the pch ids are getting identified right, shouldn't we then move
INTEL_PCH_LPT_LP_DEVICE_ID_TYPE check higher up in the pch
identification, and accept BDW for that too, and make IS_BROADWELL(dev)
a fallback after both the LPT variants have been checked?
Finally the condition below is busted!
> For reference we started receiving logs with this uncessary and incorrect WARN.
>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Reference: https://bugs.freedesktop.org/attachment.cgi?id=110972
> ---
> drivers/gpu/drm/i915/i915_drv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 308774f..d4ed3a9 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -462,7 +462,7 @@ void intel_detect_pch(struct drm_device *dev)
> } else if (id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
> dev_priv->pch_type = PCH_LPT;
> DRM_DEBUG_KMS("Found LynxPoint PCH\n");
> - WARN_ON(!IS_HASWELL(dev));
> + WARN_ON(!IS_HASWELL(dev) || !IS_BROADWELL(dev));
This will warn always...
BR,
Jani.
> WARN_ON(IS_HSW_ULT(dev));
> } else if (IS_BROADWELL(dev)) {
> dev_priv->pch_type = PCH_LPT;
> --
> 2.1.0
>
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--
Jani Nikula, Intel Open Source Technology Center
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