On Tue, Jul 11, 2017 at 08:05:39PM +0300, Ville Syrjälä wrote:
> On Thu, Jul 06, 2017 at 05:40:37PM +0300, Imre Deak wrote:
> > The pattern of a power well backing a set of fuses whose initialization
> > we need to wait for during power well enabling is common to all GEN9+
> > platforms. Adding support for this to the HSW power well enable helper
> > allows us to use the HSW/BDW power well code for GEN9+ as well in a
> > follow-up patch.
> >
> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gvt/display.c | 6 +++---
> > drivers/gpu/drm/i915/i915_drv.h | 1 +
> > drivers/gpu/drm/i915/i915_reg.h | 8 ++++----
> > drivers/gpu/drm/i915/intel_runtime_pm.c | 34 ++++++++++++++++++++++++++-------
> > 4 files changed, 35 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
> > index 2deb05f..13599bb 100644
> > --- a/drivers/gpu/drm/i915/gvt/display.c
> > +++ b/drivers/gpu/drm/i915/gvt/display.c
> > @@ -178,9 +178,9 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
> > SDE_PORTE_HOTPLUG_SPT);
> > vgpu_vreg(vgpu, SKL_FUSE_STATUS) |=
> > SKL_FUSE_DOWNLOAD_STATUS |
> > - SKL_FUSE_PG0_DIST_STATUS |
> > - SKL_FUSE_PG1_DIST_STATUS |
> > - SKL_FUSE_PG2_DIST_STATUS;
> > + SKL_FUSE_PG_DIST_STATUS(0) |
> > + SKL_FUSE_PG_DIST_STATUS(1) |
> > + SKL_FUSE_PG_DIST_STATUS(2);
> > vgpu_vreg(vgpu, LCPLL1_CTL) |=
> > LCPLL_PLL_ENABLE |
> > LCPLL_PLL_LOCK;
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index dc5ca5a..9e97536 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -1396,6 +1396,7 @@ struct i915_power_well {
> > u32 irq_pipe_mask;
> > /* The pw is backing the VGA functionality */
> > bool has_vga:1;
> > + bool has_fuses:1;
> > } hsw;
> > };
> > const struct i915_power_well_ops *ops;
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 845f50c..794d65c 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -8023,10 +8023,10 @@ enum {
> >
> > /* SKL Fuse Status */
> > #define SKL_FUSE_STATUS _MMIO(0x42000)
> > -#define SKL_FUSE_DOWNLOAD_STATUS (1<<31)
> > -#define SKL_FUSE_PG0_DIST_STATUS (1<<27)
> > -#define SKL_FUSE_PG1_DIST_STATUS (1<<26)
> > -#define SKL_FUSE_PG2_DIST_STATUS (1<<25)
> > +#define SKL_FUSE_DOWNLOAD_STATUS (1<<31)
> > +/* PG0 (HW control->no power well ID), PG1..PG2 (SKL_DISP_PW1..SKL_DISP_PW2) */
> > +#define SKL_PW_TO_PG(pw) ((pw) - SKL_DISP_PW_1 + 1)
> > +#define SKL_FUSE_PG_DIST_STATUS(pg) (1 << (27 - (pg)))
> >
> > /* Per-pipe DDI Function Control */
> > #define _TRANS_DDI_FUNC_CTL_A 0x60400
> > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > index 14d4ff4..c204be0 100644
> > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > @@ -400,16 +400,36 @@ static void hsw_wait_for_power_well_disable(struct drm_i915_private *dev_priv,
> > !!(reqs & 1), !!(reqs & 2), !!(reqs & 4), !!(reqs & 8));
> > }
> >
> > +static void gen9_wait_for_power_well_fuses(struct drm_i915_private *dev_priv,
> > + int pg)
> > +{
> > + /* Timeout 5us for PG#0, for other PGs 1us */
> > + WARN_ON(intel_wait_for_register(dev_priv, SKL_FUSE_STATUS,
> > + SKL_FUSE_PG_DIST_STATUS(pg),
> > + SKL_FUSE_PG_DIST_STATUS(pg), 1));
> > +}
> > +
> > static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
> > struct i915_power_well *power_well)
> > {
> > enum i915_power_well_id id = power_well->id;
> > + bool wait_fuses = power_well->hsw.has_fuses;
> > + int pg;
> > u32 val;
> >
> > + if (wait_fuses) {
> > + pg = SKL_PW_TO_PG(id);
> > + if (pg == 1)
> > + gen9_wait_for_power_well_fuses(dev_priv, pg - 1);
> > + }
>
> This part looks magicy. The macro adds 1, but here you have to subtract
> 1 when feeding it the value, which seems odd.
That one maps PG1 to PW1, PG2 to PW2 etc.
> And apparently 1 is somehow special, but I can't tell why.
For power well 1 we need to wait both for fuses in PG#0 before enabling
and fuses in PG#1 after enabling the power well. For all other power
wells we only need to wait for the fuses in the corresponding PG after
enabling. I could add a comment to clarify this.
>
> > +
> > val = I915_READ(HSW_PWR_WELL_DRIVER);
> > I915_WRITE(HSW_PWR_WELL_DRIVER, val | HSW_PWR_WELL_CTL_REQ(id));
> > hsw_wait_for_power_well_enable(dev_priv, power_well);
> >
> > + if (wait_fuses)
> > + gen9_wait_for_power_well_fuses(dev_priv, pg);
> > +
> > hsw_power_well_post_enable(dev_priv, power_well->hsw.irq_pipe_mask,
> > power_well->hsw.has_vga);
> > }
> > @@ -810,15 +830,15 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
> > case SKL_DISP_PW_1:
> > if (intel_wait_for_register(dev_priv,
> > SKL_FUSE_STATUS,
> > - SKL_FUSE_PG0_DIST_STATUS,
> > - SKL_FUSE_PG0_DIST_STATUS,
> > + SKL_FUSE_PG_DIST_STATUS(0),
> > + SKL_FUSE_PG_DIST_STATUS(0),
> > 1)) {
> > DRM_ERROR("PG0 not enabled\n");
> > return;
> > }
> > break;
> > case SKL_DISP_PW_2:
> > - if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
> > + if (!(fuse_status & SKL_FUSE_PG_DIST_STATUS(1))) {
> > DRM_ERROR("PG1 in disabled state\n");
> > return;
> > }
> > @@ -863,15 +883,15 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
> > if (power_well->id == SKL_DISP_PW_1) {
> > if (intel_wait_for_register(dev_priv,
> > SKL_FUSE_STATUS,
> > - SKL_FUSE_PG1_DIST_STATUS,
> > - SKL_FUSE_PG1_DIST_STATUS,
> > + SKL_FUSE_PG_DIST_STATUS(1),
> > + SKL_FUSE_PG_DIST_STATUS(1),
> > 1))
> > DRM_ERROR("PG1 distributing status timeout\n");
> > } else if (power_well->id == SKL_DISP_PW_2) {
> > if (intel_wait_for_register(dev_priv,
> > SKL_FUSE_STATUS,
> > - SKL_FUSE_PG2_DIST_STATUS,
> > - SKL_FUSE_PG2_DIST_STATUS,
> > + SKL_FUSE_PG_DIST_STATUS(2),
> > + SKL_FUSE_PG_DIST_STATUS(2),
> > 1))
> > DRM_ERROR("PG2 distributing status timeout\n");
> > }
> > --
> > 2.7.4
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Ville Syrjälä
> Intel OTC
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