[Intel-gfx] Find bugs in i915 driver

[Xu, Anhua]

Thanks Chris. I add this in the the commit description. The updated patch is below: 

commit 71c3ff04834a01c81a5843996b87397273eb538d
Author: Xu Anhua <anhua.xu at intel.com>
Date:   Tue Jul 31 17:16:50 2012 +0800

    i915: make the parameters passed-in coherent with functions'
    	definition when calling hdmi/adpa/lvds_pipe_enabled()
    
    This bug is indroduced by commit 1519b9956eb4b4180fa3f47c73341463cdcfaa37

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f615976..5fc8c8d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1383,7 +1383,7 @@ static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
 				     enum pipe pipe, int reg)
 {
 	u32 val = I915_READ(reg);
-	WARN(hdmi_pipe_enabled(dev_priv, val, pipe),
+	WARN(hdmi_pipe_enabled(dev_priv, pipe, val),
 	     "PCH HDMI (0x%08x) enabled on transcoder %c, should be disabled\n",
 	     reg, pipe_name(pipe));
 
@@ -1403,13 +1403,13 @@ static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
 
 	reg = PCH_ADPA;
 	val = I915_READ(reg);
-	WARN(adpa_pipe_enabled(dev_priv, val, pipe),
+	WARN(adpa_pipe_enabled(dev_priv, pipe, val),
 	     "PCH VGA enabled on transcoder %c, should be disabled\n",
 	     pipe_name(pipe));
 
 	reg = PCH_LVDS;
 	val = I915_READ(reg);
-	WARN(lvds_pipe_enabled(dev_priv, val, pipe),
+	WARN(lvds_pipe_enabled(dev_priv, pipe, val),
 	     "PCH LVDS enabled on transcoder %c, should be disabled\n",
 	     pipe_name(pipe));
 
@@ -1871,7 +1871,7 @@ static void disable_pch_hdmi(struct drm_i915_private *dev_priv,
 			     enum pipe pipe, int reg)
 {
 	u32 val = I915_READ(reg);
-	if (hdmi_pipe_enabled(dev_priv, val, pipe)) {
+	if (hdmi_pipe_enabled(dev_priv, pipe, val)) {
 		DRM_DEBUG_KMS("Disabling pch HDMI %x on pipe %d\n",
 			      reg, pipe);
 		I915_WRITE(reg, val & ~PORT_ENABLE);
@@ -1893,12 +1893,12 @@ static void intel_disable_pch_ports(struct drm_i915_private *dev_priv,
 
 	reg = PCH_ADPA;
 	val = I915_READ(reg);
-	if (adpa_pipe_enabled(dev_priv, val, pipe))
+	if (adpa_pipe_enabled(dev_priv, pipe, val))
 		I915_WRITE(reg, val & ~ADPA_DAC_ENABLE);
 
 	reg = PCH_LVDS;
 	val = I915_READ(reg);
-	if (lvds_pipe_enabled(dev_priv, val, pipe)) {
+	if (lvds_pipe_enabled(dev_priv, pipe, val)) {
 		DRM_DEBUG_KMS("disable lvds on pipe %d val 0x%08x\n", pipe, val);
 		I915_WRITE(reg, val & ~LVDS_PORT_EN);
 		POSTING_READ(reg);

> -----Original Message-----
> From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
> Sent: Tuesday, July 31, 2012 3:58 PM
> To: Xu, Anhua; intel-gfx at lists.freedesktop.org
> Subject: Re: [Intel-gfx] Find bugs in i915 driver
> 
> On Tue, 31 Jul 2012 02:29:01 +0000, "Xu, Anhua" <anhua.xu at intel.com>
> wrote:
> > Hi, I found some bugs in i915 driver when reviewing intel_display.c The
> parameter passed-in for function hdmi/adpa/lvds_pipe_enabled() are not
> coherent with functions' definition.
> > This is the patch.
> 
> Patch looks good, you might want to mention that the regression was
> introduced with commit 1519b9956eb4b4180fa3f47c73341463cdcfaa37.
> 
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> -Chris
> 
> --
> Chris Wilson, Intel Open Source Technology Centre