This is a note to let you know that I've just added the patch titled
drm/radeon: avoid turning off spread spectrum for used pll
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-avoid-turning-off-spread-spectrum-for-used-pll.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 5efcc76c13a745f98e7b6604d6aca49761be1970 Mon Sep 17 00:00:00 2001
From: Jerome Glisse <jgli...@redhat.com>
Date: Fri, 17 Aug 2012 14:40:04 -0400
Subject: drm/radeon: avoid turning off spread spectrum for used pll
From: Jerome Glisse <jgli...@redhat.com>
commit 5efcc76c13a745f98e7b6604d6aca49761be1970 upstream.
If spread spectrum is enabled and in use for a given pll we
should not turn it off as it will lead to turning off display
for crtc that use the pll (this behavior was observed on chelsea
edp).
Signed-off-by: Jerome Glisse <jgli...@redhat.com>
Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/gpu/drm/radeon/atombios_crtc.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -444,11 +444,28 @@ union atom_enable_ss {
static void atombios_crtc_program_ss(struct radeon_device *rdev,
int enable,
int pll_id,
+ int crtc_id,
struct radeon_atom_ss *ss)
{
+ unsigned i;
int index = GetIndexIntoMasterTable(COMMAND,
EnableSpreadSpectrumOnPPLL);
union atom_enable_ss args;
+ if (!enable) {
+ for (i = 0; i < 6; i++) {
+ if (rdev->mode_info.crtcs[i] &&
+ rdev->mode_info.crtcs[i]->enabled &&
+ i != crtc_id &&
+ pll_id == rdev->mode_info.crtcs[i]->pll_id) {
+ /* one other crtc is using this pll don't turn
+ * off spread spectrum as it might turn off
+ * display on active crtc
+ */
+ return;
+ }
+ }
+ }
+
memset(&args, 0, sizeof(args));
if (ASIC_IS_DCE5(rdev)) {
@@ -1039,7 +1056,7 @@ static void atombios_crtc_set_pll(struct
radeon_compute_pll_legacy(pll, adjusted_clock, &pll_clock,
&fb_div, &frac_fb_div,
&ref_div, &post_div);
- atombios_crtc_program_ss(rdev, ATOM_DISABLE, radeon_crtc->pll_id, &ss);
+ atombios_crtc_program_ss(rdev, ATOM_DISABLE, radeon_crtc->pll_id,
radeon_crtc->crtc_id, &ss);
atombios_crtc_program_pll(crtc, radeon_crtc->crtc_id,
radeon_crtc->pll_id,
encoder_mode, radeon_encoder->encoder_id,
mode->clock,
@@ -1062,7 +1079,7 @@ static void atombios_crtc_set_pll(struct
ss.step = step_size;
}
- atombios_crtc_program_ss(rdev, ATOM_ENABLE,
radeon_crtc->pll_id, &ss);
+ atombios_crtc_program_ss(rdev, ATOM_ENABLE,
radeon_crtc->pll_id, radeon_crtc->crtc_id, &ss);
}
}
@@ -1571,11 +1588,11 @@ void radeon_atom_disp_eng_pll_init(struc
ASIC_INTERNAL_SS_ON_DCPLL,
rdev->clock.default_dispclk);
if (ss_enabled)
- atombios_crtc_program_ss(rdev, ATOM_DISABLE,
ATOM_DCPLL, &ss);
+ atombios_crtc_program_ss(rdev, ATOM_DISABLE,
ATOM_DCPLL, -1, &ss);
/* XXX: DCE5, make sure voltage, dispclk is high enough */
atombios_crtc_set_disp_eng_pll(rdev,
rdev->clock.default_dispclk);
if (ss_enabled)
- atombios_crtc_program_ss(rdev, ATOM_ENABLE, ATOM_DCPLL,
&ss);
+ atombios_crtc_program_ss(rdev, ATOM_ENABLE, ATOM_DCPLL,
-1, &ss);
}
}
Patches currently in stable-queue which might be from jgli...@redhat.com are
queue-3.4/drm-radeon-avoid-turning-off-spread-spectrum-for-used-pll.patch
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