linux-kernel - [ 15/34] drm/radeon/kms: fix MSI re-arm on rv370+

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Message-Id: <20120301213924.690173361@linuxfoundation.org>
Date:	Thu, 01 Mar 2012 13:39:37 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Alex Deucher <alexander.deucher@....com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 15/34] drm/radeon/kms: fix MSI re-arm on rv370+

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@....com>

commit b7f5b7dec3d539a84734f2bcb7e53fbb1532a40b upstream.

MSI_REARM_EN register is a write only trigger register.
There is no need RMW when re-arming.

May fix:
https://bugs.freedesktop.org/show_bug.cgi?id=41668

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/radeon/r100.c  |    4 +---
 drivers/gpu/drm/radeon/rs600.c |    4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -218,9 +218,7 @@ int r100_irq_process(struct radeon_devic
 			WREG32(RADEON_AIC_CNTL, msi_rearm | RS400_MSI_REARM);
 			break;
 		default:
-			msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
-			WREG32(RADEON_MSI_REARM_EN, msi_rearm);
-			WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
+			WREG32(RADEON_MSI_REARM_EN, RV370_MSI_REARM_EN);
 			break;
 		}
 	}
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -270,9 +270,7 @@ int rs600_irq_process(struct radeon_devi
 			WREG32(RADEON_BUS_CNTL, msi_rearm | RS600_MSI_REARM);
 			break;
 		default:
-			msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
-			WREG32(RADEON_MSI_REARM_EN, msi_rearm);
-			WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
+			WREG32(RADEON_MSI_REARM_EN, RV370_MSI_REARM_EN);
 			break;
 		}
 	}


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