On Thu, 2018-02-22 at 14:43 +0200, Ville Syrjälä wrote:
> On Thu, Feb 22, 2018 at 07:16:07AM +0000, Pandiyan, Dhinakaran wrote:
> >
> > On Tue, 2018-02-20 at 21:00 +0200, Ville Syrjala wrote:
> > > From: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > >
> > > Just store function pointers that give us the correct register offsets
> > > instead of storing the register offsets themselves. Slightly less
> > > efficient perhaps but saves a few bytes and better matches how we do
> > > things elsewhere.
> > >
> > > v2: Keep a local array of data registers (Chris)
> > >
> > Intriguing, why bother storing register offsets in one go if it's okay
> > to make these additional function calls for every aux transaction.
> >
> > What am I missing here?
>
> Slight optimization to do them only once per aux transfer instead of
> potentially multiple times on account of the retry loops.
>
Yeah, that optimization intrigued me because the additional function
calls this patch introduces make the existing code suboptimal. :)
That's enough bikeshed I suppose, thanks for your answer.
> >
> >
> >
> > > Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
> > > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > > ---
> > > drivers/gpu/drm/i915/intel_dp.c | 85
> > > ++++++++++++++++++++--------------------
> > > drivers/gpu/drm/i915/intel_drv.h | 5 ++-
> > > 2 files changed, 45 insertions(+), 45 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > > b/drivers/gpu/drm/i915/intel_dp.c
> > > index eeb8a026fd08..b0c273b5b2a9 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -936,7 +936,7 @@ static uint32_t
> > > intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
> > > {
> > > struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > - i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg;
> > > + i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
> > > uint32_t status;
> > > bool done;
> > >
> > > @@ -1089,7 +1089,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> > > struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> > > struct drm_i915_private *dev_priv =
> > > to_i915(intel_dig_port->base.base.dev);
> > > - i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg;
> > > + i915_reg_t ch_ctl, ch_data[5];
> > > uint32_t aux_clock_divider;
> > > int i, ret, recv_bytes;
> > > uint32_t status;
> > > @@ -1097,6 +1097,10 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> > > bool has_aux_irq = HAS_AUX_IRQ(dev_priv);
> > > bool vdd;
> > >
> > > + ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
> > > + for (i = 0; i < ARRAY_SIZE(ch_data); i++)
> > > + ch_data[i] = intel_dp->aux_ch_data_reg(intel_dp, i);
> > > +
> > > pps_lock(intel_dp);
> > >
> > > /*
> > > @@ -1154,7 +1158,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> > > for (try = 0; try < 5; try++) {
> > > /* Load the send data into the aux channel data
> > > registers */
> > > for (i = 0; i < send_bytes; i += 4)
> > > - I915_WRITE(intel_dp->aux_ch_data_reg[i >> 2],
> > > + I915_WRITE(ch_data[i >> 2],
> > > intel_dp_pack_aux(send + i,
> > > send_bytes - i));
> > >
> > > @@ -1239,7 +1243,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> > > recv_bytes = recv_size;
> > >
> > > for (i = 0; i < recv_bytes; i += 4)
> > > - intel_dp_unpack_aux(I915_READ(intel_dp->aux_ch_data_reg[i >>
> > > 2]),
> > > + intel_dp_unpack_aux(I915_READ(ch_data[i >> 2]),
> > > recv + i, recv_bytes - i);
> > >
> > > ret = recv_bytes;
> > > @@ -1396,9 +1400,11 @@ intel_aux_power_domain(struct intel_dp *intel_dp)
> > > }
> > > }
> > >
> > > -static i915_reg_t g4x_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch)
> > > +static i915_reg_t g4x_aux_ctl_reg(struct intel_dp *intel_dp)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_B:
> > > case AUX_CH_C:
> > > @@ -1410,9 +1416,11 @@ static i915_reg_t g4x_aux_ctl_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t g4x_aux_data_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch, int index)
> > > +static i915_reg_t g4x_aux_data_reg(struct intel_dp *intel_dp, int index)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_B:
> > > case AUX_CH_C:
> > > @@ -1424,9 +1432,11 @@ static i915_reg_t g4x_aux_data_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t ilk_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch)
> > > +static i915_reg_t ilk_aux_ctl_reg(struct intel_dp *intel_dp)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_A:
> > > return DP_AUX_CH_CTL(aux_ch);
> > > @@ -1440,9 +1450,11 @@ static i915_reg_t ilk_aux_ctl_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t ilk_aux_data_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch, int index)
> > > +static i915_reg_t ilk_aux_data_reg(struct intel_dp *intel_dp, int index)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_A:
> > > return DP_AUX_CH_DATA(aux_ch, index);
> > > @@ -1456,9 +1468,11 @@ static i915_reg_t ilk_aux_data_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t skl_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch)
> > > +static i915_reg_t skl_aux_ctl_reg(struct intel_dp *intel_dp)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_A:
> > > case AUX_CH_B:
> > > @@ -1472,9 +1486,11 @@ static i915_reg_t skl_aux_ctl_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t skl_aux_data_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch, int index)
> > > +static i915_reg_t skl_aux_data_reg(struct intel_dp *intel_dp, int index)
> > > {
> > > + struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > + enum aux_ch aux_ch = intel_dp->aux_ch;
> > > +
> > > switch (aux_ch) {
> > > case AUX_CH_A:
> > > case AUX_CH_B:
> > > @@ -1488,37 +1504,20 @@ static i915_reg_t skl_aux_data_reg(struct
> > > drm_i915_private *dev_priv,
> > > }
> > > }
> > >
> > > -static i915_reg_t intel_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch)
> > > -{
> > > - if (INTEL_GEN(dev_priv) >= 9)
> > > - return skl_aux_ctl_reg(dev_priv, aux_ch);
> > > - else if (HAS_PCH_SPLIT(dev_priv))
> > > - return ilk_aux_ctl_reg(dev_priv, aux_ch);
> > > - else
> > > - return g4x_aux_ctl_reg(dev_priv, aux_ch);
> > > -}
> > > -
> > > -static i915_reg_t intel_aux_data_reg(struct drm_i915_private *dev_priv,
> > > - enum aux_ch aux_ch, int index)
> > > -{
> > > - if (INTEL_GEN(dev_priv) >= 9)
> > > - return skl_aux_data_reg(dev_priv, aux_ch, index);
> > > - else if (HAS_PCH_SPLIT(dev_priv))
> > > - return ilk_aux_data_reg(dev_priv, aux_ch, index);
> > > - else
> > > - return g4x_aux_data_reg(dev_priv, aux_ch, index);
> > > -}
> > > -
> > > static void intel_aux_reg_init(struct intel_dp *intel_dp)
> > > {
> > > struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > > - enum aux_ch aux_ch = intel_dp->aux_ch;
> > > - int i;
> > >
> > > - intel_dp->aux_ch_ctl_reg = intel_aux_ctl_reg(dev_priv, aux_ch);
> > > - for (i = 0; i < ARRAY_SIZE(intel_dp->aux_ch_data_reg); i++)
> > > - intel_dp->aux_ch_data_reg[i] = intel_aux_data_reg(dev_priv,
> > > aux_ch, i);
> > > + if (INTEL_GEN(dev_priv) >= 9) {
> > > + intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg;
> > > + intel_dp->aux_ch_data_reg = skl_aux_data_reg;
> > > + } else if (HAS_PCH_SPLIT(dev_priv)) {
> > > + intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg;
> > > + intel_dp->aux_ch_data_reg = ilk_aux_data_reg;
> > > + } else {
> > > + intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg;
> > > + intel_dp->aux_ch_data_reg = g4x_aux_data_reg;
> > > + }
> > > }
> > >
> > > static void
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h
> > > b/drivers/gpu/drm/i915/intel_drv.h
> > > index 7f6a7f592fe6..a72820fe5262 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -1038,8 +1038,6 @@ struct intel_dp_compliance {
> > >
> > > struct intel_dp {
> > > i915_reg_t output_reg;
> > > - i915_reg_t aux_ch_ctl_reg;
> > > - i915_reg_t aux_ch_data_reg[5];
> > > uint32_t DP;
> > > int link_rate;
> > > uint8_t lane_count;
> > > @@ -1124,6 +1122,9 @@ struct intel_dp {
> > > int send_bytes,
> > > uint32_t aux_clock_divider);
> > >
> > > + i915_reg_t (*aux_ch_ctl_reg)(struct intel_dp *dp);
> > > + i915_reg_t (*aux_ch_data_reg)(struct intel_dp *dp, int index);
> > > +
> > > /* This is called before a link training is starterd */
> > > void (*prepare_link_retrain)(struct intel_dp *intel_dp);
> > >
>
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