Attachment 90667 Details for Bug 69723 – possible fix

possible fix

0001-drm-radeon-dpm-disable-ss-on-Cayman.patch (text/plain), 1.21 KB, created by Alex Deucher on 2013-12-12 14:55:37 UTC

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Creator: Alex Deucher

Created: 2013-12-12 14:55:37 UTC

Size: 1.21 KB

patch

obsolete

>From 5f638189aeffc9384c7912d170eea289afb016b8 Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexander.deucher@amd.com>
>Date: Mon, 9 Dec 2013 17:46:59 -0500
>Subject: [PATCH] drm/radeon/dpm: disable ss on Cayman
>
>Spread spectrum seems to cause hangs when dynamic clock
>switching is enabled.  Disable it for now. This does not
>affect performance or the amount of power saved. Tracked
>down by Martin Andersson.
>
>bug:
>https://bugs.freedesktop.org/show_bug.cgi?id=69723
>
>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>Cc: stable@vger.kernel.org
>---
> drivers/gpu/drm/radeon/rv770_dpm.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
>diff --git a/drivers/gpu/drm/radeon/rv770_dpm.c b/drivers/gpu/drm/radeon/rv770_dpm.c
>index 913b025..374499d 100644
>--- a/drivers/gpu/drm/radeon/rv770_dpm.c
>+++ b/drivers/gpu/drm/radeon/rv770_dpm.c
>@@ -2328,6 +2328,12 @@ void rv770_get_engine_memory_ss(struct radeon_device *rdev)
> 	pi->mclk_ss = radeon_atombios_get_asic_ss_info(rdev, &ss,
> 						       ASIC_INTERNAL_MEMORY_SS, 0);
> 
>+	/* disable ss, causes hangs on some cayman boards */
>+	if (rdev->family == CHIP_CAYMAN) {
>+		pi->sclk_ss = false;
>+		pi->mclk_ss = false;
>+	}
>+
> 	if (pi->sclk_ss || pi->mclk_ss)
> 		pi->dynamic_ss = true;
> 	else
>-- 
>1.8.3.1
>

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Attachments on bug 69723: 86424 | 86889 | 86945 | 89246 | 89884 | 89885 | 90542 | 90667 | 102082

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