From: Mika Kuoppala Date: Fri, 27 Feb 2015 16:11:09 +0000 (+0200) Subject: drm/i915: Do both mt and gen6 style forcewake reset on ivb probe X-Git-Tag: firefly_0821_release~176^2~1470^2~58^2~330 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6ea2556f3e2549284331a3a29a5984f859c3cd5b;p=firefly-linux-kernel-4.4.55.git drm/i915: Do both mt and gen6 style forcewake reset on ivb probe commit 05a2fb157e44 ("drm/i915: Consolidate forcewake code") failed to take into account that we have used to reset both the gen6 style and the multithreaded style forcewake registers. This is due to fact that ivb can use either, depending on how the bios has set up the machine. Mimic the old semantics before we have determined the correct variety and reset both before the ecobus probe. Cc: Chris Wilson Cc: Huang Ying Signed-off-by: Mika Kuoppala Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 8879f17770aa..4eb3cb2389b9 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -1082,8 +1082,14 @@ static void intel_uncore_fw_domains_init(struct drm_device *dev) /* We need to init first for ECOBUS access and then * determine later if we want to reinit, in case of MT access is - * not working + * not working. In this stage we don't know which flavour this + * ivb is, so it is better to reset also the gen6 fw registers + * before the ecobus check. */ + + __raw_i915_write32(dev_priv, FORCEWAKE, 0); + __raw_posting_read(dev_priv, ECOBUS); + fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER, FORCEWAKE_MT, FORCEWAKE_MT_ACK);