From: ville.syrjala@linux.intel.com
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH] drm/i915: Read CHV_PLL_DW8 from the correct offset
Date: Wed, 11 Mar 2015 22:52:08 +0200 [thread overview]
Message-ID: <1426107128-779-1-git-send-email-ville.syrjala@linux.intel.com> (raw)
From: Ville Syrjälä <ville.syrjala@linux.intel.com>
We accidentally pass 'pipe' instead of 'port' to CHV_PLL_DW8() and
with PIPE_C we end up at register offset 0x8320 which isn't the
0x8020 we wanted. Fix it.
The problem was fortunately caught by the sanity check in vlv_dpio_read():
WARNING: CPU: 1 PID: 238 at ../drivers/gpu/drm/i915/intel_sideband.c:200 vlv_dpio_read+0x77/0x80 [i915]()
DPIO read pipe C reg 0x8320 == 0xffffffff
The problem got introduced with this commit:
commit 71af07f91f12bbab96335e202c82525d31680960
Author: Vijay Purushothaman <vijay.a.purushothaman@linux.intel.com>
Date: Thu Mar 5 19:33:08 2015 +0530
drm/i915: Update prop, int co-eff and gain threshold for CHV
Cc: Vijay Purushothaman <vijay.a.purushothaman@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ecbad5a..198e5fc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6270,7 +6270,7 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
}
vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW6(port), loopfilter);
- dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW8(pipe));
+ dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW8(port));
dpio_val &= ~DPIO_CHV_TDC_TARGET_CNT_MASK;
dpio_val |= (tribuf_calcntr << DPIO_CHV_TDC_TARGET_CNT_SHIFT);
vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW8(port), dpio_val);
--
2.0.5
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next reply other threads:[~2015-03-11 20:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-11 20:52 ville.syrjala [this message]
2015-03-12 2:11 ` [PATCH] drm/i915: Read CHV_PLL_DW8 from the correct offset shuang.he
2015-03-12 3:20 ` Todd Previte
2015-03-12 9:53 ` Daniel Vetter
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