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.syrjala@xxxxxxxxxxxxxxx>
> >
> > 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.
>
>
>
> > Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > 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);
> >
--
Ville Syrjälä
Intel OTC
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