From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jesse Barnes , Darren Hart , Deepak S , Jani Nikula Subject: [PATCH 3.19 028/101] drm/i915/vlv: remove wait for previous GFX clk disable request Date: Fri, 17 Apr 2015 15:28:16 +0200 Message-Id: <20150417132515.636277234@linuxfoundation.org> In-Reply-To: <20150417132514.379828774@linuxfoundation.org> References: <20150417132514.379828774@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jesse Barnes commit 5df0582bf036bb5f9a8ad8db5884fe13a55347d1 upstream. Looks like it was introduced in: commit 650ad970a39f8b6164fe8613edc150f585315289 Author: Imre Deak Date: Fri Apr 18 16:35:02 2014 +0300 drm/i915: vlv: factor out vlv_force_gfx_clock and check for pending force-of but I'm not sure why. It has caused problems for us in the past (see 85250ddff7a6 "drm/i915/chv: Remove Wait for a previous gfx force-off" and 8d4eee9cd7a1 "drm/i915: vlv: increase timeout when forcing on the GFX clock") and doesn't seem to be required, so let's just drop it. References: https://bugs.freedesktop.org/show_bug.cgi?id=89611 Signed-off-by: Jesse Barnes Tested-by: Darren Hart Reviewed-by: Deepak S Signed-off-by: Jani Nikula Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/i915_drv.c | 14 -------------- 1 file changed, 14 deletions(-) --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1197,21 +1197,7 @@ int vlv_force_gfx_clock(struct drm_i915_ u32 val; int err; - val = I915_READ(VLV_GTLC_SURVIVABILITY_REG); - #define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT) - /* Wait for a previous force-off to settle */ - if (force_on && !IS_CHERRYVIEW(dev_priv->dev)) { - /* WARN_ON only for the Valleyview */ - WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on); - - err = wait_for(!COND, 20); - if (err) { - DRM_ERROR("timeout waiting for GFX clock force-off (%08x)\n", - I915_READ(VLV_GTLC_SURVIVABILITY_REG)); - return err; - } - } val = I915_READ(VLV_GTLC_SURVIVABILITY_REG); val &= ~VLV_GFX_CLK_FORCE_ON_BIT;