On Thu, Jun 18, 2015 at 11:36:00AM +0300, Mika Kuoppala wrote:
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0b979ad..3684f92 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1461,6 +1461,9 @@ enum skl_disp_power_wells {
> #define RING_MAX_IDLE(base) ((base)+0x54)
> #define RING_HWS_PGA(base) ((base)+0x80)
> #define RING_HWS_PGA_GEN6(base) ((base)+0x2080)
> +#define RING_RESET_CTL(base) ((base)+0xd0)
> +#define RESET_CTL_REQUEST_RESET (1 << 0)
> +#define RESET_CTL_READY_TO_RESET (1 << 1)
>
> #define HSW_GTT_CACHE_EN 0x4024
> #define GTT_CACHE_EN_ALL 0xF0007FFF
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c
> b/drivers/gpu/drm/i915/intel_uncore.c
> index 4a86cf0..6a19b3e 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -1455,9 +1455,52 @@ static int gen6_do_reset(struct drm_device *dev)
> return ret;
> }
>
> +static int wait_for_register(struct drm_i915_private *dev_priv,
> + const u32 reg,
> + const u32 mask,
> + const u32 value,
> + const unsigned long timeout)
To be overly fussy, timeout_ms.
I like having units for frequently confused variables like timeouts.
(I am being fussy, because I like this function and expect to convert
lots of callsites over to it, so clarity is important.)
> +{
> + return wait_for((I915_READ(reg) & mask) == value, timeout);
> +}
> +
> +static int gen8_do_reset(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_engine_cs *engine;
> + int ret, i;
> +
> + for_each_ring(engine, dev_priv, i) {
> + I915_WRITE(RING_RESET_CTL(engine->mmio_base),
> + _MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
> +
> + ret = wait_for_register(dev_priv,
> + RING_RESET_CTL(engine->mmio_base),
> + RESET_CTL_READY_TO_RESET,
> + RESET_CTL_READY_TO_RESET,
> + 700);
> + if (ret) {
In a similar vein, we ignore ret here so just if (wait_for_register()) {
and not_ready: ...; return -EIO;
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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