On Fri, Jan 08, 2016 at 06:58:45PM +0200, Mika Kuoppala wrote:
> With gen9+ the edram capabilities are defined so
> that we can calculate the edram (ellc) size accordingly.
>
> Note that there are undefined combinations for some subset of
> edram capability bits. Return the closest size for undefined indexes.
> Even if we get it wrong with beginning of future gen enabling, the size
> information is currently only used for boot message and in debugfs entry.
>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 14 ++++++++++++++
> drivers/gpu/drm/i915/intel_uncore.c | 9 +++++----
> 2 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index f88b75ec5047..52283c44a0c1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6820,6 +6820,20 @@ enum skl_disp_power_wells {
> #define IDIHASHMSK(x) (((x) & 0x3f) << 16)
> #define HSW_EDRAM_CAP _MMIO(0x120010)
> #define EDRAM_ENABLED 0x1
> +#define EDRAM_NUM_BANKS(cap) (((cap) >> 1) & 0xf)
> +#define __EDRAM_WAYS(cap) (((cap) >> 5) & 0x7)
> +#define EDRAM_NUM_WAYS(cap) ({ \
> + int __ways[8] = { 4, 8, 12, 16, 16, 16, 16, 16 }; \
> + __ways[__EDRAM_WAYS(cap)]; \
> +})
> +#define __EDRAM_SETS(cap) (((cap) >> 8) & 0x3)
> +#define EDRAM_NUM_SETS(cap) ({ \
> + int __sets[4] = { 1, 1, 2, 2 }; \
> + __sets[__EDRAM_SETS(cap)]; \
> +})
> +#define EDRAM_SIZE(cap) (EDRAM_NUM_BANKS(cap) * \
> + EDRAM_NUM_WAYS(cap) * \
> + EDRAM_NUM_SETS(cap))
Please just make a function out of this, no reason to make it into a
hard-to-read macro. E.g. gen9_edram_size or whatever is the first gen this
starts to be valid for.
-Daniel
>
> #define GEN6_UCGCTL1 _MMIO(0x9400)
> # define GEN6_EU_TCUNIT_CLOCK_GATE_DISABLE (1 << 16)
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index 0c9059cb3d13..c5fb1937b82d 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -315,12 +315,13 @@ unsigned intel_uncore_edram_size_mb(struct drm_i915_private *dev_priv)
> if (!HAS_EDRAM(dev_priv))
> return 0;
>
> - /* The docs do not explain exactly how the calculation can be
> - * made. It is somewhat guessable, but for now, it's always
> - * 128MB.
> + /* The needed capability bits for size calculation
> + * are not there with pre gen9 so return 128MB always.
> */
> + if (INTEL_INFO(dev_priv)->gen < 9)
> + return 128;
>
> - return 128;
> + return EDRAM_SIZE(dev_priv->edram_cap);
> }
>
> static void intel_uncore_edram_detect(struct drm_i915_private *dev_priv)
> --
> 2.5.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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