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From: Greg KH on 6 Aug 2010 14:40
2.6.35-stable review patch. If anyone has any objections, please let us know.

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

From: Alex Deucher <alexdeucher(a)gmail.com>

commit e06b14ee91a2ddefc9a67443a6cd8ee0fa800115 upstream.

Logic was:
if (mode0 && mode1)
else if (mode0)
else

Should be:
if (mode0 && mode1)
else if (mode0)
else if (mode1)

Otherwise we may end up calculating the priority regs with
unitialized values.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=16492

Signed-off-by: Alex Deucher <alexdeucher(a)gmail.com>
Signed-off-by: Dave Airlie <airlied(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/gpu/drm/radeon/rs690.c | 27 +++++++++------------------
drivers/gpu/drm/radeon/rv515.c | 23 +++++++++--------------
2 files changed, 18 insertions(+), 32 deletions(-)

--- a/drivers/gpu/drm/radeon/rs690.c
+++ b/drivers/gpu/drm/radeon/rs690.c
@@ -398,7 +398,9 @@ void rs690_bandwidth_update(struct radeo
struct drm_display_mode *mode1 = NULL;
struct rs690_watermark wm0;
struct rs690_watermark wm1;
- u32 tmp, d1mode_priority_a_cnt, d2mode_priority_a_cnt;
+ u32 tmp;
+ u32 d1mode_priority_a_cnt = S_006548_D1MODE_PRIORITY_A_OFF(1);
+ u32 d2mode_priority_a_cnt = S_006548_D1MODE_PRIORITY_A_OFF(1);
fixed20_12 priority_mark02, priority_mark12, fill_rate;
fixed20_12 a, b;

@@ -495,10 +497,6 @@ void rs690_bandwidth_update(struct radeo
d1mode_priority_a_cnt |= S_006548_D1MODE_PRIORITY_A_ALWAYS_ON(1);
d2mode_priority_a_cnt |= S_006D48_D2MODE_PRIORITY_A_ALWAYS_ON(1);
}
- WREG32(R_006548_D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
- WREG32(R_00654C_D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
- WREG32(R_006D48_D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
- WREG32(R_006D4C_D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
} else if (mode0) {
if (dfixed_trunc(wm0.dbpp) > 64)
a.full = dfixed_mul(wm0.dbpp, wm0.num_line_pair);
@@ -528,13 +526,7 @@ void rs690_bandwidth_update(struct radeo
d1mode_priority_a_cnt = dfixed_trunc(priority_mark02);
if (rdev->disp_priority == 2)
d1mode_priority_a_cnt |= S_006548_D1MODE_PRIORITY_A_ALWAYS_ON(1);
- WREG32(R_006548_D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
- WREG32(R_00654C_D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
- WREG32(R_006D48_D2MODE_PRIORITY_A_CNT,
- S_006D48_D2MODE_PRIORITY_A_OFF(1));
- WREG32(R_006D4C_D2MODE_PRIORITY_B_CNT,
- S_006D4C_D2MODE_PRIORITY_B_OFF(1));
- } else {
+ } else if (mode1) {
if (dfixed_trunc(wm1.dbpp) > 64)
a.full = dfixed_mul(wm1.dbpp, wm1.num_line_pair);
else
@@ -563,13 +555,12 @@ void rs690_bandwidth_update(struct radeo
d2mode_priority_a_cnt = dfixed_trunc(priority_mark12);
if (rdev->disp_priority == 2)
d2mode_priority_a_cnt |= S_006D48_D2MODE_PRIORITY_A_ALWAYS_ON(1);
- WREG32(R_006548_D1MODE_PRIORITY_A_CNT,
- S_006548_D1MODE_PRIORITY_A_OFF(1));
- WREG32(R_00654C_D1MODE_PRIORITY_B_CNT,
- S_00654C_D1MODE_PRIORITY_B_OFF(1));
- WREG32(R_006D48_D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
- WREG32(R_006D4C_D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
}
+
+ WREG32(R_006548_D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
+ WREG32(R_00654C_D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
+ WREG32(R_006D48_D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
+ WREG32(R_006D4C_D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
}

uint32_t rs690_mc_rreg(struct radeon_device *rdev, uint32_t reg)
--- a/drivers/gpu/drm/radeon/rv515.c
+++ b/drivers/gpu/drm/radeon/rv515.c
@@ -925,7 +925,9 @@ void rv515_bandwidth_avivo_update(struct
struct drm_display_mode *mode1 = NULL;
struct rv515_watermark wm0;
struct rv515_watermark wm1;
- u32 tmp, d1mode_priority_a_cnt, d2mode_priority_a_cnt;
+ u32 tmp;
+ u32 d1mode_priority_a_cnt = MODE_PRIORITY_OFF;
+ u32 d2mode_priority_a_cnt = MODE_PRIORITY_OFF;
fixed20_12 priority_mark02, priority_mark12, fill_rate;
fixed20_12 a, b;

@@ -999,10 +1001,6 @@ void rv515_bandwidth_avivo_update(struct
d1mode_priority_a_cnt |= MODE_PRIORITY_ALWAYS_ON;
d2mode_priority_a_cnt |= MODE_PRIORITY_ALWAYS_ON;
}
- WREG32(D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
- WREG32(D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
- WREG32(D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
- WREG32(D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
} else if (mode0) {
if (dfixed_trunc(wm0.dbpp) > 64)
a.full = dfixed_div(wm0.dbpp, wm0.num_line_pair);
@@ -1032,11 +1030,7 @@ void rv515_bandwidth_avivo_update(struct
d1mode_priority_a_cnt = dfixed_trunc(priority_mark02);
if (rdev->disp_priority == 2)
d1mode_priority_a_cnt |= MODE_PRIORITY_ALWAYS_ON;
- WREG32(D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
- WREG32(D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
- WREG32(D2MODE_PRIORITY_A_CNT, MODE_PRIORITY_OFF);
- WREG32(D2MODE_PRIORITY_B_CNT, MODE_PRIORITY_OFF);
- } else {
+ } else if (mode1) {
if (dfixed_trunc(wm1.dbpp) > 64)
a.full = dfixed_div(wm1.dbpp, wm1.num_line_pair);
else
@@ -1065,11 +1059,12 @@ void rv515_bandwidth_avivo_update(struct
d2mode_priority_a_cnt = dfixed_trunc(priority_mark12);
if (rdev->disp_priority == 2)
d2mode_priority_a_cnt |= MODE_PRIORITY_ALWAYS_ON;
- WREG32(D1MODE_PRIORITY_A_CNT, MODE_PRIORITY_OFF);
- WREG32(D1MODE_PRIORITY_B_CNT, MODE_PRIORITY_OFF);
- WREG32(D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
- WREG32(D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
}
+
+ WREG32(D1MODE_PRIORITY_A_CNT, d1mode_priority_a_cnt);
+ WREG32(D1MODE_PRIORITY_B_CNT, d1mode_priority_a_cnt);
+ WREG32(D2MODE_PRIORITY_A_CNT, d2mode_priority_a_cnt);
+ WREG32(D2MODE_PRIORITY_B_CNT, d2mode_priority_a_cnt);
}

void rv515_bandwidth_update(struct radeon_device *rdev)


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