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SubjectRe: [RFC 10/16] drm/nouveau/timer: skip calibration on GK20A
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On Sat, Feb 1, 2014 at 1:16 PM, Alexandre Courbot <acourbot@nvidia.com> wrote:
> GK20A's timer is directly attached to the system timer and cannot be
> calibrated. Skip the calibration phase on that chip since the
> corresponding registers do not exist.
Just a curiosity: What timer resolution does the HW initialise at?

>
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---
> drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c | 19 +++++++++++++------
> 1 file changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c
> index c0bdd10..822fe0d 100644
> --- a/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c
> +++ b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c
> @@ -185,6 +185,10 @@ nv04_timer_init(struct nouveau_object *object)
> if (ret)
> return ret;
>
> + /* gk20a does not have the calibration registers */
> + if (device->chipset == 0xea)
> + goto skip_clk_init;
> +
> /* aim for 31.25MHz, which gives us nanosecond timestamps */
> d = 1000000 / 32;
>
> @@ -235,20 +239,23 @@ nv04_timer_init(struct nouveau_object *object)
> d >>= 1;
> }
>
> - /* restore the time before suspend */
> - lo = priv->suspend_time;
> - hi = (priv->suspend_time >> 32);
> -
> nv_debug(priv, "input frequency : %dHz\n", f);
> nv_debug(priv, "input multiplier: %d\n", m);
> nv_debug(priv, "numerator : 0x%08x\n", n);
> nv_debug(priv, "denominator : 0x%08x\n", d);
> nv_debug(priv, "timer frequency : %dHz\n", (f * m) * d / n);
> - nv_debug(priv, "time low : 0x%08x\n", lo);
> - nv_debug(priv, "time high : 0x%08x\n", hi);
>
> nv_wr32(priv, NV04_PTIMER_NUMERATOR, n);
> nv_wr32(priv, NV04_PTIMER_DENOMINATOR, d);
> +
> +skip_clk_init:
> + /* restore the time before suspend */
> + lo = priv->suspend_time;
> + hi = (priv->suspend_time >> 32);
> +
> + nv_debug(priv, "time low : 0x%08x\n", lo);
> + nv_debug(priv, "time high : 0x%08x\n", hi);
> +
> nv_wr32(priv, NV04_PTIMER_INTR_0, 0xffffffff);
> nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
> nv_wr32(priv, NV04_PTIMER_TIME_1, hi);
> --
> 1.8.5.3
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel


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