[Intel-gfx] [PATCH 2/2] drm/i915: KBL - Recommended buffer translation programming for DisplayPort
Jani Nikula
jani.nikula at linux.intel.com
Tue Oct 4 07:05:26 UTC 2016
On Tue, 04 Oct 2016, "Vivi, Rodrigo" <rodrigo.vivi at intel.com> wrote:
> On Mon, 2016-10-03 at 13:50 +0300, Jani Nikula wrote:
>> On Fri, 30 Sep 2016, Rodrigo Vivi <rodrigo.vivi at intel.com> wrote:
>> > According to spec: "KBL re-uses SKL values, except where
>> > specific KBL values are listed."
>> >
>> > And recently spec has changed adding different table for Display Port only.
>> > But for all SKUs (H,S,U,Y) we have slightly different values.
>> >
>> > Cc: Manasi Navare <manasi.d.navare at intel.com>
>> > Cc: Arthur Runyan <arthur.j.runyan at intel.com>
>> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
>> > ---
>> > drivers/gpu/drm/i915/intel_ddi.c | 88 +++++++++++++++++++++++++++++++++++-----
>> > 1 file changed, 78 insertions(+), 10 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>> > index 018964b..1573360 100644
>> > --- a/drivers/gpu/drm/i915/intel_ddi.c
>> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> > @@ -167,8 +167,47 @@ static const struct ddi_buf_trans skl_y_ddi_translations_dp[] = {
>> > { 0x80005012, 0x000000C0, 0x3 },
>> > };
>> >
>> > +/* Kabylake H and S */
>> > +static const struct ddi_buf_trans kbl_ddi_translations_dp[] = {
>> > + { 0x00002016, 0x000000A0, 0x0 },
>> > + { 0x00005012, 0x0000009B, 0x0 },
>> > + { 0x00007011, 0x00000088, 0x0 },
>> > + { 0x80009010, 0x000000C0, 0x1 },
>> > + { 0x00002016, 0x0000009B, 0x0 },
>> > + { 0x00005012, 0x00000088, 0x0 },
>> > + { 0x80007011, 0x000000C0, 0x1 },
>> > + { 0x00002016, 0x0000009F, 0x0 },
>> > + { 0x80005012, 0x000000C0, 0x1 },
>> > +};
>> > +
>> > +/* Kabylake U */
>> > +static const struct ddi_buf_trans kbl_u_ddi_translations_dp[] = {
>> > + { 0x0000201B, 0x000000A1, 0x0 },
>> > + { 0x00005012, 0x00000088, 0x0 },
>> > + { 0x80007011, 0x000000CD, 0x3 },
>> > + { 0x80009010, 0x000000C0, 0x3 },
>> > + { 0x0000201B, 0x0000009D, 0x0 },
>> > + { 0x80005012, 0x000000C0, 0x3 },
>> > + { 0x80007011, 0x000000C0, 0x3 },
>> > + { 0x00002016, 0x0000004F, 0x0 },
>> > + { 0x80005012, 0x000000C0, 0x3 },
>> > +};
>> > +
>> > +/* Kabylake Y */
>> > +static const struct ddi_buf_trans kbl_y_ddi_translations_dp[] = {
>> > + { 0x00001017, 0x000000A1, 0x0 },
>> > + { 0x00005012, 0x00000088, 0x0 },
>> > + { 0x80007011, 0x000000CD, 0x3 },
>> > + { 0x8000800F, 0x000000C0, 0x3 },
>> > + { 0x00001017, 0x0000009D, 0x0 },
>> > + { 0x80005012, 0x000000C0, 0x3 },
>> > + { 0x80007011, 0x000000C0, 0x3 },
>> > + { 0x00001017, 0x0000004C, 0x0 },
>> > + { 0x80005012, 0x000000C0, 0x3 },
>> > +};
>> > +
>> > /*
>> > - * Skylake H and S
>> > + * Skylake/Kabylake H and S
>> > * eDP 1.4 low vswing translation parameters
>> > */
>> > static const struct ddi_buf_trans skl_ddi_translations_edp[] = {
>> > @@ -185,7 +224,7 @@ static const struct ddi_buf_trans skl_ddi_translations_edp[] = {
>> > };
>> >
>> > /*
>> > - * Skylake U
>> > + * Skylake/Kabylake U
>> > * eDP 1.4 low vswing translation parameters
>> > */
>> > static const struct ddi_buf_trans skl_u_ddi_translations_edp[] = {
>> > @@ -202,7 +241,7 @@ static const struct ddi_buf_trans skl_u_ddi_translations_edp[] = {
>> > };
>> >
>> > /*
>> > - * Skylake Y
>> > + * Skylake/Kabylake Y
>> > * eDP 1.4 low vswing translation parameters
>> > */
>> > static const struct ddi_buf_trans skl_y_ddi_translations_edp[] = {
>> > @@ -218,7 +257,7 @@ static const struct ddi_buf_trans skl_y_ddi_translations_edp[] = {
>> > { 0x00000018, 0x0000008A, 0x0 },
>> > };
>> >
>> > -/* Skylake U, H and S */
>> > +/* Skylake/Kabylake U, H and S */
>> > static const struct ddi_buf_trans skl_ddi_translations_hdmi[] = {
>> > { 0x00000018, 0x000000AC, 0x0 },
>> > { 0x00005012, 0x0000009D, 0x0 },
>> > @@ -233,7 +272,7 @@ static const struct ddi_buf_trans skl_ddi_translations_hdmi[] = {
>> > { 0x80000018, 0x000000C0, 0x1 },
>> > };
>> >
>> > -/* Skylake Y */
>> > +/* Skylake/Kabylake Y */
>> > static const struct ddi_buf_trans skl_y_ddi_translations_hdmi[] = {
>> > { 0x00000018, 0x000000A1, 0x0 },
>> > { 0x00005012, 0x000000DF, 0x0 },
>> > @@ -334,10 +373,10 @@ bdw_get_buf_trans_edp(struct drm_i915_private *dev_priv, int *n_entries)
>> > static const struct ddi_buf_trans *
>> > skl_get_buf_trans_dp(struct drm_i915_private *dev_priv, int *n_entries)
>> > {
>> > - if (IS_SKL_ULX(dev_priv) || IS_KBL_ULX(dev_priv)) {
>> > + if (IS_SKL_ULX(dev_priv)) {
>> > *n_entries = ARRAY_SIZE(skl_y_ddi_translations_dp);
>> > return skl_y_ddi_translations_dp;
>> > - } else if (IS_SKL_ULT(dev_priv) || IS_KBL_ULT(dev_priv)) {
>> > + } else if (IS_SKL_ULT(dev_priv)) {
>> > *n_entries = ARRAY_SIZE(skl_u_ddi_translations_dp);
>> > return skl_u_ddi_translations_dp;
>> > } else {
>> > @@ -347,6 +386,21 @@ skl_get_buf_trans_dp(struct drm_i915_private *dev_priv, int *n_entries)
>> > }
>> >
>> > static const struct ddi_buf_trans *
>> > +kbl_get_buf_trans_dp(struct drm_i915_private *dev_priv, int *n_entries)
>> > +{
>> > + if (IS_KBL_ULX(dev_priv)) {
>> > + *n_entries = ARRAY_SIZE(kbl_y_ddi_translations_dp);
>> > + return kbl_y_ddi_translations_dp;
>> > + } else if (IS_KBL_ULT(dev_priv)) {
>> > + *n_entries = ARRAY_SIZE(kbl_u_ddi_translations_dp);
>> > + return kbl_u_ddi_translations_dp;
>> > + } else {
>> > + *n_entries = ARRAY_SIZE(kbl_ddi_translations_dp);
>> > + return kbl_ddi_translations_dp;
>> > + }
>> > +}
>> > +
>> > +static const struct ddi_buf_trans *
>> > skl_get_buf_trans_edp(struct drm_i915_private *dev_priv, int *n_entries)
>> > {
>> > if (dev_priv->vbt.edp.low_vswing) {
>> > @@ -362,7 +416,10 @@ skl_get_buf_trans_edp(struct drm_i915_private *dev_priv, int *n_entries)
>> > }
>> > }
>> >
>> > - return skl_get_buf_trans_dp(dev_priv, n_entries);
>> > + if (dev_priv->vbt.edp.low_vswing)
>> > + return kbl_get_buf_trans_dp(dev_priv, n_entries);
>> > + else
>> > + return skl_get_buf_trans_dp(dev_priv, n_entries);
>>
>> This seems really confusing.
>
> I agree, but I would like to avoid duplicating the identical tables...
> those by spec are explicitly same table...
>
> another option without duplicating the tables is duplicating the
> function like below... what I believe it is still confusing with all
> those skl and kbl inside this function...
>
> what do you prefer?
The thing that bugs me here is that you may return klb_something on
skl. We reuse plenty of older gen stuff for newer gens, but this being
the other way round is the confusing part. So just call it
skl_something, and reuse in kbl?
BR,
Jani.
>
> static const struct ddi_buf_trans
> *
> kbl_get_buf_trans_edp(struct drm_i915_private *dev_priv, int
> *n_entries)
> {
> if (dev_priv->vbt.edp.low_vswing)
> {
> if (IS_KBL_ULX(dev_priv))
> {
> *n_entries =
> ARRAY_SIZE(skl_y_ddi_translations_edp);
> return
> skl_y_ddi_translations_edp;
> } else if (IS_KBL_ULT(dev_priv))
> {
> *n_entries =
> ARRAY_SIZE(skl_u_ddi_translations_edp);
> return
> skl_u_ddi_translations_edp;
> } else
> {
> *n_entries =
> ARRAY_SIZE(skl_ddi_translations_edp);
> return
> skl_ddi_translations_edp;
> }
> }
> return kbl_get_buf_trans_dp(dev_priv,
> n_entries);
> }
>
>
>
>
>>
>> BR,
>> Jani.
>>
>>
>> > }
>> >
>> > static const struct ddi_buf_trans *
>> > @@ -430,7 +487,13 @@ void intel_prepare_dp_ddi_buffers(struct intel_encoder *encoder)
>> > if (IS_BROXTON(dev_priv))
>> > return;
>> >
>> > - if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
>> > + if (IS_KABYLAKE(dev_priv)) {
>> > + ddi_translations_fdi = NULL;
>> > + ddi_translations_dp =
>> > + kbl_get_buf_trans_dp(dev_priv, &n_dp_entries);
>> > + ddi_translations_edp =
>> > + skl_get_buf_trans_edp(dev_priv, &n_edp_entries);
>> > + } else if (IS_SKYLAKE(dev_priv)) {
>> > ddi_translations_fdi = NULL;
>> > ddi_translations_dp =
>> > skl_get_buf_trans_dp(dev_priv, &n_dp_entries);
>> > @@ -1437,7 +1500,12 @@ static void skl_ddi_set_iboost(struct intel_encoder *encoder, u32 level)
>> > if (dp_iboost) {
>> > iboost = dp_iboost;
>> > } else {
>> > - ddi_translations = skl_get_buf_trans_dp(dev_priv, &n_entries);
>> > + if (IS_KABYLAKE(dev_priv))
>> > + ddi_translations = kbl_get_buf_trans_dp(dev_priv,
>> > + &n_entries);
>> > + else
>> > + ddi_translations = skl_get_buf_trans_dp(dev_priv,
>> > + &n_entries);
>> > iboost = ddi_translations[level].i_boost;
>> > }
>> > } else if (type == INTEL_OUTPUT_EDP) {
>>
>
--
Jani Nikula, Intel Open Source Technology Center
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