Re: [PATCH v5] drm/i915/chv: Enable Render Standby (RC6) for Cherryview

Mika Kuoppala
2014-05-15T10:23:46Z

Mika Kuoppala <mika.kuoppala@linux.intel.com> writes:

> deepak.s@linux.intel.com writes:
>
>> From: Deepak S <deepak.s@linux.intel.com>
>>
>> v2: Configure PCBR if BIOS fails allocate pcbr (deepak)
>>
>> v3: Fix PCBR condition check during CHV RC6 Enable flag set
>>
>> v4: Fixup PCBR comment msg. (Chris)
>> Rebase against latest code (Deak)
>> Fixup Spurious hunk (Ben)
>>
>> v5: Fix PCBR and commentis msg (mika)
>>
>> Signed-off-by: Deepak S <deepak.s@linux.intel.com>
>> Acked-by: Ben Widawsky <ben@bwidawsk.net>
>> ---
>> drivers/gpu/drm/i915/i915_reg.h | 2 +
>> drivers/gpu/drm/i915/intel_pm.c | 115 +++++++++++++++++++++++++++++++++++++---
>> 2 files changed, 111 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index c850254..b4074fd 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -962,6 +962,8 @@ enum punit_power_well {
>> #define VLV_IMR (VLV_DISPLAY_BASE + 0x20a8)
>> #define VLV_ISR (VLV_DISPLAY_BASE + 0x20ac)
>> #define VLV_PCBR (VLV_DISPLAY_BASE + 0x2120)
>> +#define VLV_PCBR_ADDR_SHIFT 12
>> +
>> #define DISPLAY_PLANE_FLIP_PENDING(plane) (1<<(11-(plane))) /* A and B only */
>> #define EIR 0x020b0
>> #define EMR 0x020b4
>> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
>> index 270b659..7a6e50e 100644
>> --- a/drivers/gpu/drm/i915/intel_pm.c
>> +++ b/drivers/gpu/drm/i915/intel_pm.c
>> @@ -3301,6 +3301,13 @@ static void gen6_disable_rps(struct drm_device *dev)
>> gen6_disable_rps_interrupts(dev);
>> }
>>
>> +static void cherryview_disable_rps(struct drm_device *dev)
>> +{
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> +
>> + I915_WRITE(GEN6_RC_CONTROL, 0);
>> +}
>> +
>> static void valleyview_disable_rps(struct drm_device *dev)
>> {
>> struct drm_i915_private *dev_priv = dev->dev_private;
>> @@ -3723,6 +3730,35 @@ static void valleyview_check_pctx(struct drm_i915_private *dev_priv)
>> dev_priv->vlv_pctx->stolen->start);
>> }
>>
>> +
>> +/* Check that the pcbr address is not empty. */
>> +static void cherryview_check_pctx(struct drm_i915_private *dev_priv)
>> +{
>> + unsigned long pctx_addr = I915_READ(VLV_PCBR) & ~4095;
>> +
>> + WARN_ON((pctx_addr >> VLV_PCBR_ADDR_SHIFT) == 0);
>> +}
>> +
>> +static void cherryview_setup_pctx(struct drm_device *dev)
>> +{
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> + unsigned long pctx_paddr, paddr;
>> + struct i915_gtt *gtt = &dev_priv->gtt;
>> + u32 pcbr;
>> + int pctx_size = 32*1024;
>> +
>> + WARN_ON(!mutex_is_locked(&dev->struct_mutex));
>> +
>> + pcbr = I915_READ(VLV_PCBR);
>> + if ((pcbr >> VLV_PCBR_ADDR_SHIFT) == 0) {
>> + paddr = (dev_priv->mm.stolen_base +
>> + (gtt->stolen_size - pctx_size));
>> +
>> + pctx_paddr = (paddr & (~4095));
>> + I915_WRITE(VLV_PCBR, pctx_paddr);
>> + }
>> +}
>> +
>> static void valleyview_setup_pctx(struct drm_device *dev)
>> {
>> struct drm_i915_private *dev_priv = dev->dev_private;
>> @@ -3812,11 +3848,70 @@ static void valleyview_init_gt_powersave(struct drm_device *dev)
>> mutex_unlock(&dev_priv->rps.hw_lock);
>> }
>>
>> +static void cherryview_init_gt_powersave(struct drm_device *dev)
>> +{
>> + cherryview_setup_pctx(dev);
>> +}
>> +
>> static void valleyview_cleanup_gt_powersave(struct drm_device *dev)
>> {
>> valleyview_cleanup_pctx(dev);
>> }
>>
>> +static void cherryview_enable_rps(struct drm_device *dev)
>> +{
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> + struct intel_ring_buffer *ring;
>> + u32 gtfifodbg, rc6_mode = 0, pcbr;
>> + int i;
>> +
>> + WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
>> +
>> + gtfifodbg = I915_READ(GTFIFODBG);
>> + if (gtfifodbg) {
>> + DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
>> + gtfifodbg);
>> + I915_WRITE(GTFIFODBG, gtfifodbg);
>> + }
>> +
>> + cherryview_check_pctx(dev_priv);
>> +
>> + /* 1a & 1b: Get forcewake during program sequence. Although the driver
>> + * hasn't enabled a state yet where we need forcewake, BIOS may have.*/
>> + gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
>
> You are starting to configure rc6 with the possibility that bios
> has already enabled it.
>
> I am still convinced there should be
>
> + I915_WRITE(GEN6_RC_CONTROL, 0);
>
> in here.

I forgot to mention that with that addition made,
you can add

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

> -Mika
>
>> + /* 2a: Program RC6 thresholds.*/
>> + I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
>> + I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
>> + I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
>> +
>> + for_each_ring(ring, dev_priv, i)
>> + I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
>> + I915_WRITE(GEN6_RC_SLEEP, 0);
>> +
>> + I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
>> +
>> + /* allows RC6 residency counter to work */
>> + I915_WRITE(VLV_COUNTER_CONTROL,
>> + _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
>> + VLV_MEDIA_RC6_COUNT_EN |
>> + VLV_RENDER_RC6_COUNT_EN));
>> +
>> + /* For now we assume BIOS is allocating and populating the PCBR */
>> + pcbr = I915_READ(VLV_PCBR);
>> +
>> + DRM_DEBUG_DRIVER("PCBR offset : 0x%x\n", pcbr);
>> +
>> + /* 3: Enable RC6 */
>> + if ((intel_enable_rc6(dev) & INTEL_RC6_ENABLE) &&
>> + (pcbr >> VLV_PCBR_ADDR_SHIFT))
>> + rc6_mode = GEN6_RC_CTL_EI_MODE(1);
>> +
>> + I915_WRITE(GEN6_RC_CONTROL, rc6_mode);
>> +
>> + gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
>> +}
>> +
>> static void valleyview_enable_rps(struct drm_device *dev)
>> {
>> struct drm_i915_private *dev_priv = dev->dev_private;
>> @@ -4625,13 +4720,17 @@ void intel_init_gt_powersave(struct drm_device *dev)
>> {
>> i915.enable_rc6 = sanitize_rc6_option(dev, i915.enable_rc6);
>>
>> - if (IS_VALLEYVIEW(dev))
>> + if (IS_CHERRYVIEW(dev))
>> + cherryview_init_gt_powersave(dev);
>> + else if (IS_VALLEYVIEW(dev))
>> valleyview_init_gt_powersave(dev);
>> }
>>
>> void intel_cleanup_gt_powersave(struct drm_device *dev)
>> {
>> - if (IS_VALLEYVIEW(dev))
>> + if (IS_CHERRYVIEW(dev))
>> + return;
>> + else if (IS_VALLEYVIEW(dev))
>> valleyview_cleanup_gt_powersave(dev);
>> }
>>
>> @@ -4645,11 +4744,13 @@ void intel_disable_gt_powersave(struct drm_device *dev)
>> if (IS_IRONLAKE_M(dev)) {
>> ironlake_disable_drps(dev);
>> ironlake_disable_rc6(dev);
>> - } else if (IS_GEN6(dev) || IS_GEN7(dev)) {
>> + } else if (INTEL_INFO(dev)->gen >= 6) {
>> cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);
>> cancel_work_sync(&dev_priv->rps.work);
>> mutex_lock(&dev_priv->rps.hw_lock);
>> - if (IS_VALLEYVIEW(dev))
>> + if (IS_CHERRYVIEW(dev))
>> + cherryview_disable_rps(dev);
>> + else if (IS_VALLEYVIEW(dev))
>> valleyview_disable_rps(dev);
>> else
>> gen6_disable_rps(dev);
>> @@ -4667,7 +4768,9 @@ static void intel_gen6_powersave_work(struct work_struct *work)
>>
>> mutex_lock(&dev_priv->rps.hw_lock);
>>
>> - if (IS_VALLEYVIEW(dev)) {
>> + if (IS_CHERRYVIEW(dev)) {
>> + cherryview_enable_rps(dev);
>> + } else if (IS_VALLEYVIEW(dev)) {
>> valleyview_enable_rps(dev);
>> } else if (IS_BROADWELL(dev)) {
>> gen8_enable_rps(dev);
>> @@ -4692,7 +4795,7 @@ void intel_enable_gt_powersave(struct drm_device *dev)
>> ironlake_enable_rc6(dev);
>> intel_init_emon(dev);
>> mutex_unlock(&dev->struct_mutex);
>> - } else if (IS_GEN6(dev) || IS_GEN7(dev)) {
>> + } else if (INTEL_INFO(dev)->gen >= 6) {
>> /*
>> * PCU communication is slow and this doesn't need to be
>> * done at any specific time, so do this out of our fast path
>> --
>> 1.9.1
>>
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