[Intel-gfx] [PATCH 01/12] drm/i915: Add wait_for_us
Dave Gordon
david.s.gordon at intel.com
Tue Feb 2 13:35:33 UTC 2016
On 02/02/16 11:06, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> This is for callers who want micro-second precision but are not
> waiting from the atomic context.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 3 +--
> drivers/gpu/drm/i915/intel_drv.h | 9 +++++----
> drivers/gpu/drm/i915/intel_psr.c | 2 +-
> 3 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index e2bea710614f..fb8a76ec6ade 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1788,11 +1788,10 @@ static void wait_panel_status(struct intel_dp *intel_dp,
> I915_READ(pp_stat_reg),
> I915_READ(pp_ctrl_reg));
>
> - if (_wait_for((I915_READ(pp_stat_reg) & mask) == value, 5000, 10)) {
> + if (_wait_for((I915_READ(pp_stat_reg) & mask) == value, 5000000, 10000))
> DRM_ERROR("Panel status timeout: status %08x control %08x\n",
> I915_READ(pp_stat_reg),
> I915_READ(pp_ctrl_reg));
> - }
>
> DRM_DEBUG_KMS("Wait complete\n");
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index f620023ed134..779d17a9fcce 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -45,8 +45,8 @@
> * having timed out, since the timeout could be due to preemption or similar and
> * we've never had a chance to check the condition before the timeout.
> */
> -#define _wait_for(COND, MS, W) ({ \
> - unsigned long timeout__ = jiffies + msecs_to_jiffies(MS) + 1; \
> +#define _wait_for(COND, US, W) ({ \
> + unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \
> int ret__ = 0; \
> while (!(COND)) { \
> if (time_after(jiffies, timeout__)) { \
> @@ -55,7 +55,7 @@
> break; \
> } \
> if ((W) && drm_can_sleep()) { \
> - usleep_range((W)*1000, (W)*2000); \
> + usleep_range((W), (W)*2); \
> } else { \
> cpu_relax(); \
> } \
> @@ -63,7 +63,8 @@
> ret__; \
> })
>
> -#define wait_for(COND, MS) _wait_for(COND, MS, 1)
> +#define wait_for(COND, MS) _wait_for(COND, (MS) * 1000, 1000)
> +#define wait_for_us(COND, US) _wait_for(COND, US, 1)
> #define wait_for_atomic(COND, MS) _wait_for(COND, MS, 0)
> #define wait_for_atomic_us(COND, US) _wait_for((COND), \
> DIV_ROUND_UP((US), 1000), 0)
Don't these latter two macros need to be altered since the underlying
_wait_for() now takes times in us rather than ms?
.Dave.
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index 9ccff3011523..e12377963839 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -492,7 +492,7 @@ static void hsw_psr_disable(struct intel_dp *intel_dp)
>
> /* Wait till PSR is idle */
> if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL) &
> - EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
> + EDP_PSR_STATUS_STATE_MASK) == 0, 2000000, 10000))
> DRM_ERROR("Timed out waiting for PSR Idle State\n");
>
> dev_priv->psr.active = false;
>
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