On Mon, Dec 21, 2015 at 01:57:22PM +0200, Gabriel Feceoru wrote:
> On some HSW boards all pipeC tests fail with various dmesg errors.
> This seems to be caused by Pipe C beeing disabled in FUSE_STRAP and
> thus reading back the PIPECONF register is always zero.
>
> Fixed by adjusting pipe_count to 2 and thus the pipeC igt tests will
> be skipped.
>
> Signed-off-by: Gabriel Feceoru <gabriel.feceoru@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_dma.c | 3 +++
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> 2 files changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 988a380..130a496 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -813,6 +813,9 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
> !(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) {
> DRM_INFO("Display fused off, disabling\n");
> info->num_pipes = 0;
> + } else if (I915_READ(FUSE_STRAP) & HSW_PIPE_C_DISABLE) {
> + DRM_INFO("PipeC fused off\n");
> + info->num_pipes = 2;
> }
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 007ae83..0432a5f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5940,6 +5940,7 @@ enum skl_disp_power_wells {
> #define ILK_INTERNAL_GRAPHICS_DISABLE (1 << 31)
> #define ILK_INTERNAL_DISPLAY_DISABLE (1 << 30)
> #define ILK_DISPLAY_DEBUG_DISABLE (1 << 29)
> +#define HSW_PIPE_C_DISABLE (1 << 28)
According to Bspec the bit is already present on IVB.
> #define ILK_HDCP_DISABLE (1 << 25)
> #define ILK_eDP_A_DISABLE (1 << 24)
> #define HSW_CDCLK_LIMIT (1 << 24)
> --
> 1.9.1
>
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--
Ville Syrjälä
Intel OTC
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