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Message-Id: <1434443826-4929-64-git-send-email-lizf@kernel.org> Date: Tue, 16 Jun 2015 16:35:18 +0800 From: lizf@...nel.org To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Alex Deucher <alexander.deucher@....com>, Zefan Li <lizefan@...wei.com> Subject: [PATCH 3.4 064/172] drm/radeon: do a posting read in r100_set_irq From: Alex Deucher <alexander.deucher@....com> 3.4.108-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit f957063fee6392bb9365370db6db74dc0b2dce0a upstream. To make sure the writes go through the pci bridge. bug: https://bugzilla.kernel.org/show_bug.cgi?id=90741 Signed-off-by: Alex Deucher <alexander.deucher@....com> Signed-off-by: Zefan Li <lizefan@...wei.com> --- drivers/gpu/drm/radeon/r100.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 40ed0e5..8ec5b85 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -726,6 +726,10 @@ int r100_irq_set(struct radeon_device *rdev) tmp |= RADEON_FP2_DETECT_MASK; } WREG32(RADEON_GEN_INT_CNTL, tmp); + + /* read back to post the write */ + RREG32(RADEON_GEN_INT_CNTL); + return 0; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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