Hi
2013/3/25 Damien Lespiau <damien.lespiau at intel.com>:
> 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 at intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index d26147c..258e38e 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -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;
> }
> --
> 1.7.11.7
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Paulo Zanoni
