On Tue, 2018-09-18 at 22:04 +0300, Ville Syrjälä wrote:
> On Tue, Sep 18, 2018 at 11:10:10AM -0700, José Roberto de Souza
> wrote:
> > Instead of have the same code spread into 4 platforms lets share
> > it.
> > BXT do not have a PCH so here also handling this case by unseting
> > RESET_PCH_HANDSHAKE_ENABLE.
> >
> > v2(Rodrigo):
> > - renamed to intel_pch_reset_handshake()
> > - added comment about why BXT need the bit to be unset
> >
> > v3(Rodrigo and Ville):
> > - added bool have_pch to intel_pch_reset_handshake()
> > - added back BXT comment
> >
> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_runtime_pm.c | 30 ++++++++++++++-------
> > ----
> > 1 file changed, 17 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > index 9bebec389de1..4e050dc3ebde 100644
> > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > @@ -3239,18 +3239,29 @@ static void icl_mbus_init(struct
> > drm_i915_private *dev_priv)
> > I915_WRITE(MBUS_ABOX_CTL, val);
> > }
> >
> > +static void intel_pch_reset_handshake(struct drm_i915_private
> > *dev_priv,
> > + bool have_pch)
>
> You seem very intent on moving the HAS_PCH_NOP() into this function.
> I still don't like that approach. I think it's clearner to let the
> caller 100% decide whether to enable or disable the reset handshake.
Because it would just move HAS_PCH_NOP() to all the callers expect for
BXT, also we are doing the same thing right now but in a wrong place.
But if you and Rodrigo really wants it, I can change that.
>
> > +{
> > + u32 val = I915_READ(HSW_NDE_RSTWRN_OPT);
> > +
> > + if (have_pch)
> > + val |= RESET_PCH_HANDSHAKE_ENABLE;
> > + else
> > + val &= ~RESET_PCH_HANDSHAKE_ENABLE;
> > +
> > + I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> > +}
> > +
> > static void skl_display_core_init(struct drm_i915_private
> > *dev_priv,
> > bool resume)
> > {
> > struct i915_power_domains *power_domains = &dev_priv-
> > >power_domains;
> > struct i915_power_well *well;
> > - uint32_t val;
> >
> > gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
> >
> > /* enable PCH reset handshake */
> > - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> > - I915_WRITE(HSW_NDE_RSTWRN_OPT, val |
> > RESET_PCH_HANDSHAKE_ENABLE);
> > + intel_pch_reset_handshake(dev_priv, true);
> >
> > /* enable PG1 and Misc I/O */
> > mutex_lock(&power_domains->lock);
> > @@ -3306,7 +3317,6 @@ void bxt_display_core_init(struct
> > drm_i915_private *dev_priv,
> > {
> > struct i915_power_domains *power_domains = &dev_priv-
> > >power_domains;
> > struct i915_power_well *well;
> > - uint32_t val;
> >
> > gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
> >
> > @@ -3316,9 +3326,7 @@ void bxt_display_core_init(struct
> > drm_i915_private *dev_priv,
> > * Move the handshake programming to initialization sequence.
> > * Previously was left up to BIOS.
> > */
> > - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> > - val &= ~RESET_PCH_HANDSHAKE_ENABLE;
> > - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> > + intel_pch_reset_handshake(dev_priv, false);
> >
> > /* Enable PG1 */
> > mutex_lock(&power_domains->lock);
> > @@ -3439,9 +3447,7 @@ static void cnl_display_core_init(struct
> > drm_i915_private *dev_priv, bool resume
> > gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
> >
> > /* 1. Enable PCH Reset Handshake */
> > - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> > - val |= RESET_PCH_HANDSHAKE_ENABLE;
> > - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> > + intel_pch_reset_handshake(dev_priv, true);
> >
> > /* 2. Enable Comp */
> > val = I915_READ(CHICKEN_MISC_2);
> > @@ -3524,9 +3530,7 @@ static void icl_display_core_init(struct
> > drm_i915_private *dev_priv,
> > gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
> >
> > /* 1. Enable PCH reset handshake. */
> > - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> > - val |= RESET_PCH_HANDSHAKE_ENABLE;
> > - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> > + intel_pch_reset_handshake(dev_priv, true);
> >
> > for (port = PORT_A; port <= PORT_B; port++) {
> > /* 2. Enable DDI combo PHY comp. */
> > --
> > 2.19.0
>
>
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