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drm/i915: Warn if a pipe is enabled with a bogus port 

If TRANS_DDI_FUNC_CTL has been wrongly programmed with an incorrect
port, we are currently trying to read PORT_CLK_SEL(port) with an
uninitialized value.

Handle that case by returning PORT_CLK_SEL_NONE and warning about it.

v2: Move the warning inside intel_ddi_get_crtc_pll (Paulo Zanoni)

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2013-03-25 15:16:14 +00:00 committed by Daniel Vetter
parent fec46b5eff
commit a42f704b71
1 changed files with 11 additions and 5 deletions
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16
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1160,7 +1160,7 @@ static uint32_t intel_ddi_get_crtc_pll(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
uint32_t temp, ret;
enum port port;
enum port port = I915_MAX_PORTS;
enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
pipe);
int i;
@ -1176,10 +1176,16 @@ static uint32_t intel_ddi_get_crtc_pll(struct drm_i915_private *dev_priv,
port = i;
}
ret = I915_READ(PORT_CLK_SEL(port));
DRM_DEBUG_KMS("Pipe %c connected to port %c using clock 0x%08x\n",
pipe_name(pipe), port_name(port), ret);
if (port == I915_MAX_PORTS) {
WARN(1, "Pipe %c enabled on an unknown port\n",
pipe_name(pipe));
ret = PORT_CLK_SEL_NONE;
} else {
ret = I915_READ(PORT_CLK_SEL(port));
DRM_DEBUG_KMS("Pipe %c connected to port %c using clock "
"0x%08x\n", pipe_name(pipe), port_name(port),
ret);
}
return ret;
}