On Tue, 26 Nov 2019, José Roberto de Souza <jose.so...@intel.com> wrote:
> Talked with HW team and this is a left over, driver should not
> program clockgating, dekel firmware will be reponsible for any
> clockgating programing.
>
> BSpec issue: 20885
> BSpec: 49292
>
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Cc: Matt Roper <matthew.d.ro...@intel.com>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 55 +++++++-----------------
> 1 file changed, 16 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index a976606d21c7..7488dcbb637f 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3167,6 +3167,11 @@ icl_phy_set_clock_gating(struct intel_digital_port
> *dig_port, bool enable)
> u32 val, bits;
> int ln;
>
> + /*
> + * Should not be called for GEN12+, see "PHY Clockgating programming"
> + * note
> + */
> +
IMHO this kind of comments do us no good.
If you want to be paranoid,
if (WARN_ON(INTEL_GEN(dev_priv) >= 12))
return;
which has the benefit of being self-documenting code. But I'm not
convinced of even that.
BR,
Jani.
> if (tc_port == PORT_TC_NONE)
> return;
>
> @@ -3175,39 +3180,26 @@ icl_phy_set_clock_gating(struct intel_digital_port
> *dig_port, bool enable)
> MG_DP_MODE_CFG_GAONPWR_GATING;
>
> for (ln = 0; ln < 2; ln++) {
> - if (INTEL_GEN(dev_priv) >= 12) {
> - I915_WRITE(HIP_INDEX_REG(tc_port),
> HIP_INDEX_VAL(tc_port, ln));
> - val = I915_READ(DKL_DP_MODE(tc_port));
> - } else {
> - val = I915_READ(MG_DP_MODE(ln, tc_port));
> - }
> + val = I915_READ(MG_DP_MODE(ln, tc_port));
>
> if (enable)
> val |= bits;
> else
> val &= ~bits;
>
> - if (INTEL_GEN(dev_priv) >= 12)
> - I915_WRITE(DKL_DP_MODE(tc_port), val);
> - else
> - I915_WRITE(MG_DP_MODE(ln, tc_port), val);
> + I915_WRITE(MG_DP_MODE(ln, tc_port), val);
> }
>
> - if (INTEL_GEN(dev_priv) == 11) {
> - bits = MG_MISC_SUS0_CFG_TR2PWR_GATING |
> - MG_MISC_SUS0_CFG_CL2PWR_GATING |
> - MG_MISC_SUS0_CFG_GAONPWR_GATING |
> - MG_MISC_SUS0_CFG_TRPWR_GATING |
> - MG_MISC_SUS0_CFG_CL1PWR_GATING |
> - MG_MISC_SUS0_CFG_DGPWR_GATING;
> + bits = MG_MISC_SUS0_CFG_TR2PWR_GATING | MG_MISC_SUS0_CFG_CL2PWR_GATING |
> + MG_MISC_SUS0_CFG_GAONPWR_GATING | MG_MISC_SUS0_CFG_TRPWR_GATING |
> + MG_MISC_SUS0_CFG_CL1PWR_GATING | MG_MISC_SUS0_CFG_DGPWR_GATING;
>
> - val = I915_READ(MG_MISC_SUS0(tc_port));
> - if (enable)
> - val |= (bits | MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE(3));
> - else
> - val &= ~(bits |
> MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE_MASK);
> - I915_WRITE(MG_MISC_SUS0(tc_port), val);
> - }
> + val = I915_READ(MG_MISC_SUS0(tc_port));
> + if (enable)
> + val |= (bits | MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE(3));
> + else
> + val &= ~(bits | MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE_MASK);
> + I915_WRITE(MG_MISC_SUS0(tc_port), val);
> }
>
> static void
> @@ -3508,12 +3500,6 @@ static void tgl_ddi_pre_enable_dp(struct intel_encoder
> *encoder,
> * down this function.
> */
>
> - /*
> - * 7.d Type C with DP alternate or fixed/legacy/static connection -
> - * Disable PHY clock gating per Type-C DDI Buffer page
> - */
> - icl_phy_set_clock_gating(dig_port, false);
> -
> /* 7.e Configure voltage swing and related IO settings */
> tgl_ddi_vswing_sequence(encoder, crtc_state->port_clock, level,
> encoder->type);
> @@ -3565,15 +3551,6 @@ static void tgl_ddi_pre_enable_dp(struct intel_encoder
> *encoder,
> if (!is_trans_port_sync_mode(crtc_state))
> intel_dp_stop_link_train(intel_dp);
>
> - /*
> - * TODO: enable clock gating
> - *
> - * It is not written in DP enabling sequence but "PHY Clockgating
> - * programming" states that clock gating should be enabled after the
> - * link training but doing so causes all the following trainings to fail
> - * so not enabling it for now.
> - */
> -
> /* 7.l Configure and enable FEC if needed */
> intel_ddi_enable_fec(encoder, crtc_state);
> intel_dsc_enable(encoder, crtc_state);
--
Jani Nikula, Intel Open Source Graphics Center
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