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Message-ID: <20200928141543.GG5197@jausmus-gentoo-dev6>
Date: Mon, 28 Sep 2020 07:15:43 -0700
From: James Ausmus <james.ausmus@...el.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, matthew.d.roper@...el.com,
jose.souza@...el.com, ville.syrjala@...ux.intel.com,
lucas.demarchi@...el.com, hariom.pandey@...el.com
Subject: Re: [Intel-gfx] [PATCH 2/2] drm/i915/edp/jsl: Update vswing table
for HBR and HBR2
On Mon, Sep 28, 2020 at 04:43:11PM +0300, Jani Nikula wrote:
> On Mon, 28 Sep 2020, Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com> wrote:
> > JSL has update in vswing table for eDP
>
> I've thought the TLA for Jasper Lake is JSP, not JSL. At least we have
> PCH_JSP for Jasper Lake PCH.
JSP == Point (the PCH), JSL == Lake
-James
>
> >
> > BSpec: 21257
> > Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>
> > ---
> > drivers/gpu/drm/i915/display/intel_ddi.c | 67 ++++++++++++++++++++++--
> > 1 file changed, 64 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > index 4d06178cd76c..fa08463bcf2e 100644
> > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > @@ -582,6 +582,34 @@ static const struct cnl_ddi_buf_trans ehl_combo_phy_ddi_translations_dp[] = {
> > { 0x6, 0x7F, 0x3F, 0x00, 0x00 }, /* 900 900 0.0 */
> > };
> >
> > +static const struct cnl_ddi_buf_trans jsl_combo_phy_ddi_translations_edp_hbr[] = {
> > + /* NT mV Trans mV db */
> > + { 0x8, 0x7F, 0x3F, 0x00, 0x00 }, /* 200 200 0.0 */
> > + { 0x8, 0x7F, 0x38, 0x00, 0x07 }, /* 200 250 1.9 */
> > + { 0x1, 0x7F, 0x33, 0x00, 0x0C }, /* 200 300 3.5 */
> > + { 0xA, 0x35, 0x36, 0x00, 0x09 }, /* 200 350 4.9 */
> > + { 0x8, 0x7F, 0x3F, 0x00, 0x00 }, /* 250 250 0.0 */
> > + { 0x1, 0x7F, 0x38, 0x00, 0x07 }, /* 250 300 1.6 */
> > + { 0xA, 0x35, 0x35, 0x00, 0x0A }, /* 250 350 2.9 */
> > + { 0x1, 0x7F, 0x3F, 0x00, 0x00 }, /* 300 300 0.0 */
> > + { 0xA, 0x35, 0x38, 0x00, 0x07 }, /* 300 350 1.3 */
> > + { 0xA, 0x35, 0x3F, 0x00, 0x00 }, /* 350 350 0.0 */
> > +};
> > +
> > +static const struct cnl_ddi_buf_trans jsl_combo_phy_ddi_translations_edp_hbr2[] = {
> > + /* NT mV Trans mV db */
> > + { 0x8, 0x7F, 0x3F, 0x00, 0x00 }, /* 200 200 0.0 */
> > + { 0x8, 0x7F, 0x3F, 0x00, 0x00 }, /* 200 250 1.9 */
> > + { 0x1, 0x7F, 0x3D, 0x00, 0x02 }, /* 200 300 3.5 */
> > + { 0xA, 0x35, 0x38, 0x00, 0x07 }, /* 200 350 4.9 */
> > + { 0x8, 0x7F, 0x3F, 0x00, 0x00 }, /* 250 250 0.0 */
> > + { 0x1, 0x7F, 0x3F, 0x00, 0x00 }, /* 250 300 1.6 */
> > + { 0xA, 0x35, 0x3A, 0x00, 0x05 }, /* 250 350 2.9 */
> > + { 0x1, 0x7F, 0x3F, 0x00, 0x00 }, /* 300 300 0.0 */
> > + { 0xA, 0x35, 0x38, 0x00, 0x07 }, /* 300 350 1.3 */
> > + { 0xA, 0x35, 0x3F, 0x00, 0x00 }, /* 350 350 0.0 */
> > +};
> > +
> > struct icl_mg_phy_ddi_buf_trans {
> > u32 cri_txdeemph_override_11_6;
> > u32 cri_txdeemph_override_5_0;
> > @@ -1069,7 +1097,6 @@ icl_get_mg_buf_trans(struct intel_encoder *encoder, int type, int rate,
> > *n_entries = ARRAY_SIZE(icl_mg_phy_ddi_translations_rbr_hbr);
> > return icl_mg_phy_ddi_translations_rbr_hbr;
> > }
> > -
> > static const struct cnl_ddi_buf_trans *
> > ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
> > int *n_entries)
> > @@ -1098,6 +1125,34 @@ ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
> > }
> > }
> >
> > +static const struct cnl_ddi_buf_trans *
> > +jsl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
> > + int *n_entries)
> > +{
> > + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > +
> > + switch (type) {
> > + case INTEL_OUTPUT_HDMI:
> > + *n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_hdmi);
> > + return icl_combo_phy_ddi_translations_hdmi;
> > + case INTEL_OUTPUT_EDP:
> > + if (dev_priv->vbt.edp.low_vswing) {
> > + if (rate > 270000) {
> > + *n_entries = ARRAY_SIZE(jsl_combo_phy_ddi_translations_edp_hbr2);
> > + return jsl_combo_phy_ddi_translations_edp_hbr2;
> > + } else {
> > + *n_entries = ARRAY_SIZE(jsl_combo_phy_ddi_translations_edp_hbr);
> > + return jsl_combo_phy_ddi_translations_edp_hbr;
> > + }
> > + }
> > + /* fall through */
> > + default:
> > + /* All combo DP and eDP ports that do not support low_vswing */
> > + *n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_dp_hbr2);
> > + return icl_combo_phy_ddi_translations_dp_hbr2;
> > + }
> > +}
> > +
> > static const struct cnl_ddi_buf_trans *
> > tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
> > int *n_entries)
> > @@ -2265,9 +2320,12 @@ static u8 intel_ddi_dp_voltage_max(struct intel_dp *intel_dp)
> > tgl_get_dkl_buf_trans(encoder, encoder->type,
> > intel_dp->link_rate, &n_entries);
> > } else if (INTEL_GEN(dev_priv) == 11) {
> > - if (IS_ELKHARTLAKE(dev_priv))
> > + if (IS_JASPERLAKE(dev_priv))
> > + jsl_get_combo_buf_trans(encoder, encoder->type,
> > + intel_dp->link_rate, &n_entries);
> > + else if (IS_ELKHARTLAKE(dev_priv))
> > ehl_get_combo_buf_trans(encoder, encoder->type,
> > - intel_dp->link_rate, &n_entries);
> > + intel_dp->link_rate, &n_entries);
>
> This is a good example of a potential trap that having IS_ELKHARTLAKE()
> cover both ELK and JSP creates. An unsuspecting coder might change the
> if ladder to have IS_ELKHARTLAKE() first, and the subsequent
> IS_JASPERLAKE() branch would never be taken.
>
> BR,
> Jani.
>
> > else if (intel_phy_is_combo(dev_priv, phy))
> > icl_get_combo_buf_trans(encoder, encoder->type,
> > intel_dp->link_rate, &n_entries);
> > @@ -2454,6 +2512,9 @@ static void icl_ddi_combo_vswing_program(struct intel_encoder *encoder,
> > if (INTEL_GEN(dev_priv) >= 12)
> > ddi_translations = tgl_get_combo_buf_trans(encoder, type, rate,
> > &n_entries);
> > + else if (IS_JASPERLAKE(dev_priv))
> > + ddi_translations = jsl_get_combo_buf_trans(encoder, type, rate,
> > + &n_entries);
> > else if (IS_ELKHARTLAKE(dev_priv))
> > ddi_translations = ehl_get_combo_buf_trans(encoder, type, rate,
> > &n_entries);
>
> --
> Jani Nikula, Intel Open Source Graphics Center
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