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drm/i915: add port assertion check when disabling transcoders 

When a transcoder is disabled, any ports pointing at it should also be
disabled.  If they're not, we may fail to disable the transcoder,
leading to blank displays.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Jesse Barnes 2011-02-02 12:28:03 -08:00 committed by Chris Wilson
parent 19ec135838
commit 291906f11c
1 changed files with 59 additions and 0 deletions
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59
drivers/gpu/drm/i915/intel_display.c
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@ -1265,6 +1265,62 @@ static void assert_transcoder_disabled(struct drm_i915_private *dev_priv,
WARN(enabled, "transcoder assertion failed, should be off on pipe %c but is still active\n", pipe ? 'B' :'A');
}
static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
enum pipe pipe, int reg)
{
u32 val;
u32 sel_pipe;
val = I915_READ(reg);
sel_pipe = (val & DP_PIPEB_SELECT) >> 30;
WARN((val & DP_PORT_EN) && sel_pipe == pipe,
"PCH DP (0x%08x) enabled on transcoder %c, should be disabled\n",
reg, pipe ? 'B' : 'A');
}
static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
enum pipe pipe, int reg)
{
u32 val;
u32 sel_pipe;
val = I915_READ(reg);
sel_pipe = (val & TRANSCODER_B) >> 30;
WARN((val & PORT_ENABLE) && sel_pipe == pipe,
"PCH DP (0x%08x) enabled on transcoder %c, should be disabled\n",
reg, pipe ? 'B' : 'A');
}
static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
int reg;
u32 val;
u32 sel_pipe;
assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_B);
assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_C);
assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_D);
reg = PCH_ADPA;
val = I915_READ(reg);
sel_pipe = (val & ADPA_TRANS_B_SELECT) >> 30;
WARN(sel_pipe == pipe && (val & ADPA_DAC_ENABLE),
"PCH VGA enabled on transcoder %c, should be disabled\n",
pipe ? 'B' : 'A');
reg = PCH_LVDS;
val = I915_READ(reg);
sel_pipe = (val & LVDS_PIPEB_SELECT) >> 30;
WARN(sel_pipe == pipe && (val & LVDS_PORT_EN),
"PCH LVDS enabled on transcoder %c, should be disabled\n",
pipe ? 'B' : 'A');
assert_pch_hdmi_disabled(dev_priv, pipe, HDMIB);
assert_pch_hdmi_disabled(dev_priv, pipe, HDMIC);
assert_pch_hdmi_disabled(dev_priv, pipe, HDMID);
}
/**
* intel_enable_pll - enable a PLL
* @dev_priv: i915 private structure
@ -1419,6 +1475,9 @@ static void intel_disable_transcoder(struct drm_i915_private *dev_priv,
assert_fdi_tx_disabled(dev_priv, pipe);
assert_fdi_rx_disabled(dev_priv, pipe);
/* Ports must be off as well */
assert_pch_ports_disabled(dev_priv, pipe);
reg = TRANSCONF(pipe);
val = I915_READ(reg);
val &= ~TRANS_ENABLE;