On Wed, Mar 13, 2013 at 11:21:02AM -0700, Ben Widawsky wrote:
> Given certain fusing options discussed in the previous patch, it's
> possible to end up with platforms that normally have PCH but that PCH
> doesn't actually exist. In many cases, this is easily remedied with
> setting 0 pipes. This covers the other corners.
>
> Requiring this is a symptom of improper code splitting (using
> HAS_PCH_SPLIT instead of proper GEN checking, basically). I do not want
> to fix this.
>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_display.c | 4 +++-
> drivers/gpu/drm/i915/intel_lvds.c | 4 ++++
> 3 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 587dca0..ceed199 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -461,6 +461,7 @@ enum intel_pch {
> PCH_IBX, /* Ibexpeak PCH */
> PCH_CPT, /* Cougarpoint PCH */
> PCH_LPT, /* Lynxpoint PCH */
> + PCH_NOP,
> };
>
> enum intel_sbi_destination {
> @@ -1351,6 +1352,7 @@ struct drm_i915_file_private {
> #define HAS_PCH_LPT(dev) (INTEL_PCH_TYPE(dev) == PCH_LPT)
> #define HAS_PCH_CPT(dev) (INTEL_PCH_TYPE(dev) == PCH_CPT)
> #define HAS_PCH_IBX(dev) (INTEL_PCH_TYPE(dev) == PCH_IBX)
> +#define HAS_PCH_NOP(dev) (INTEL_PCH_TYPE(dev) == PCH_NOP)
> #define HAS_PCH_SPLIT(dev) (INTEL_PCH_TYPE(dev) != PCH_NONE)
>
> #define HAS_FORCE_WAKE(dev) (INTEL_INFO(dev)->has_force_wake)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index d6dbffd..1f0624e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5085,7 +5085,9 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
> */
> void intel_init_pch_refclk(struct drm_device *dev)
> {
Since this function here only deals with display refclocks I think a
num_pipes == 0 check should equally work. And also makes it clear what's
exactly going on.
> - if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
> + if (HAS_PCH_NOP(dev))
> + return;
> + else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
> ironlake_init_pch_refclk(dev);
> else if (HAS_PCH_LPT(dev))
> lpt_init_pch_refclk(dev);
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> index 6b24fc5..613ac43 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -1018,6 +1018,10 @@ static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
>
> static bool intel_lvds_supported(struct drm_device *dev)
> {
> +
> + if (HAS_PCH_NOP(dev))
> + return false;
This hunk here looks superflous, imo we should stop any and all output
probing much earlier in the callchain.
-Daniel
> +
> /* With the introduction of the PCH we gained a dedicated
> * LVDS presence pin, use it. */
> if (HAS_PCH_SPLIT(dev))
> --
> 1.8.1.5
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
