Re: [PATCH 64/71] drm/i915/chv: Don't use PCS group access reads

Daniel Vetter
2014-05-20T13:50:07Z

On Wed, Apr 09, 2014 at 07:56:50PM +0300, Ville Syrjälä wrote:
> On Wed, Apr 09, 2014 at 06:18:38PM +0200, Daniel Vetter wrote:
> > On Wed, Apr 09, 2014 at 01:29:02PM +0300, ville.syrjala@linux.intel.com wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > >
> > > All PCS groups access reads return 0xffffffff, so we can't use group
> > > access for RMW cycles. Instead target each spline separately.
> >
> > I have no idea what PCS means here and spline ... Can you please expand
> > for those who haven't yet lost their souls in chv docs? Just so we have a
> > commonly-understood jargon for talking about this stuff.
>
> I guess we should have that somewhere as a comment. The same terminology
> applies to VLV as well.

Haven't seen the promised patch yet.
-Daniel

>
> >
> > Thanks, Daniel
> >
> > >
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > ---
> > > drivers/gpu/drm/i915/i915_reg.h | 14 ++++++++++++++
> > > drivers/gpu/drm/i915/intel_dp.c | 32 ++++++++++++++++++++++++--------
> > > drivers/gpu/drm/i915/intel_hdmi.c | 34 +++++++++++++++++++++++++---------
> > > 3 files changed, 63 insertions(+), 17 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index 4617fb3..ffed03e 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -654,6 +654,13 @@ enum punit_power_well {
> > > #define DPIO_PCS_TX_LANE1_RESET (1<<7)
> > > #define VLV_PCS_DW0(ch) _PORT(ch, _VLV_PCS_DW0_CH0, _VLV_PCS_DW0_CH1)
> > >
> > > +#define _VLV_PCS01_DW0_CH0 0x200
> > > +#define _VLV_PCS23_DW0_CH0 0x400
> > > +#define _VLV_PCS01_DW0_CH1 0x2600
> > > +#define _VLV_PCS23_DW0_CH1 0x2800
> > > +#define VLV_PCS01_DW0(ch) _PORT(ch, _VLV_PCS01_DW0_CH0, _VLV_PCS01_DW0_CH1)
> > > +#define VLV_PCS23_DW0(ch) _PORT(ch, _VLV_PCS23_DW0_CH0, _VLV_PCS23_DW0_CH1)
> > > +
> > > #define _VLV_PCS_DW1_CH0 0x8204
> > > #define _VLV_PCS_DW1_CH1 0x8404
> > > #define CHV_PCS_REQ_SOFTRESET_EN (1<<23)
> > > @@ -663,6 +670,13 @@ enum punit_power_well {
> > > #define DPIO_PCS_CLK_SOFT_RESET (1<<5)
> > > #define VLV_PCS_DW1(ch) _PORT(ch, _VLV_PCS_DW1_CH0, _VLV_PCS_DW1_CH1)
> > >
> > > +#define _VLV_PCS01_DW1_CH0 0x204
> > > +#define _VLV_PCS23_DW1_CH0 0x404
> > > +#define _VLV_PCS01_DW1_CH1 0x2604
> > > +#define _VLV_PCS23_DW1_CH1 0x2804
> > > +#define VLV_PCS01_DW1(ch) _PORT(ch, _VLV_PCS01_DW1_CH0, _VLV_PCS01_DW1_CH1)
> > > +#define VLV_PCS23_DW1(ch) _PORT(ch, _VLV_PCS23_DW1_CH0, _VLV_PCS23_DW1_CH1)
> > > +
> > > #define _VLV_PCS_DW8_CH0 0x8220
> > > #define _VLV_PCS_DW8_CH1 0x8420
> > > #define VLV_PCS_DW8(ch) _PORT(ch, _VLV_PCS_DW8_CH0, _VLV_PCS_DW8_CH1)
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index 079e0e3..cc7bccd3 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -1845,13 +1845,21 @@ static void chv_post_disable_dp(struct intel_encoder *encoder)
> > > mutex_lock(&dev_priv->dpio_lock);
> > >
> > > /* Propagate soft reset to data lane reset */
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW1(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> > > val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> > >
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW0(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> > > + val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> > > + val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> > > val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> > >
> > > mutex_unlock(&dev_priv->dpio_lock);
> > > }
> > > @@ -1983,13 +1991,21 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
> > > mutex_lock(&dev_priv->dpio_lock);
> > >
> > > /* Deassert soft data lane reset*/
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW1(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> > > val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> > > + val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> > > + val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> > >
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW0(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> > > val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> > >
> > > /* Program Tx lane latency optimal setting*/
> > > for (i = 0; i < 4; i++) {
> > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > > index 6a2152b..c3896b0 100644
> > > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > > @@ -1216,13 +1216,21 @@ static void chv_hdmi_post_disable(struct intel_encoder *encoder)
> > > mutex_lock(&dev_priv->dpio_lock);
> > >
> > > /* Propagate soft reset to data lane reset */
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW1(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> > > val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(ch), val)
> > > -;
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW0(ch));
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> > > + val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> > > + val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> > > val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> > >
> > > mutex_unlock(&dev_priv->dpio_lock);
> > > }
> > > @@ -1242,13 +1250,21 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
> > > mutex_lock(&dev_priv->dpio_lock);
> > >
> > > /* Deassert soft data lane reset*/
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW1(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> > > val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> > > + val |= CHV_PCS_REQ_SOFTRESET_EN;
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> > > +
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> > > + val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> > >
> > > - val = vlv_dpio_read(dev_priv, pipe, VLV_PCS_DW0(ch));
> > > + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> > > val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> > > - vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(ch), val);
> > > + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> > >
> > > /* Program Tx latency optimal setting */
> > > for (i = 0; i < 4; i++) {
> > > --
> > > 1.8.3.2
> > >
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > +41 (0) 79 365 57 48 - http://blog.ffwll.ch
>
> --
> Ville Syrjälä
> Intel OTC

--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch