[Intel-gfx] [PATCH 24/24] drm/i915/icl: toggle PHY clock gating around link training
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Tue Jun 19 13:22:27 UTC 2018
Op 22-05-18 om 02:25 schreef Paulo Zanoni:
> The Gen11 TypeC PHY DDI Buffer chapter, PHY Clock Gating Programming
> section says that PHY clock gating should be disabled before starting
> voltage swing programming, then enabled after any link training is
> complete.
>
> Cc: Animesh Manna <animesh.manna at intel.com>
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 21 +++++++++++++
> drivers/gpu/drm/i915/intel_ddi.c | 3 ++
> drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> 4 files changed, 92 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 2ccae6c3e905..9d2c022bc3a1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1957,6 +1957,27 @@ enum i915_power_well_id {
> _MG_DP_MODE_LN1_ACU_PORT1)
> #define MG_DP_MODE_CFG_DP_X2_MODE (1 << 7)
> #define MG_DP_MODE_CFG_DP_X1_MODE (1 << 6)
> +#define MG_DP_MODE_CFG_TR2PWR_GATING (1 << 5)
> +#define MG_DP_MODE_CFG_TRPWR_GATING (1 << 4)
> +#define MG_DP_MODE_CFG_CLNPWR_GATING (1 << 3)
> +#define MG_DP_MODE_CFG_DIGPWR_GATING (1 << 2)
> +#define MG_DP_MODE_CFG_GAONPWR_GATING (1 << 1)
> +
> +#define _MG_MISC_SUS0_PORT1 0x168814
> +#define _MG_MISC_SUS0_PORT2 0x169814
> +#define _MG_MISC_SUS0_PORT3 0x16A814
> +#define _MG_MISC_SUS0_PORT4 0x16B814
> +#define MG_MISC_SUS0(tc_port) \
> + _MMIO(_PORT(tc_port, _MG_MISC_SUS0_PORT1, _MG_MISC_SUS0_PORT2))
> +#define MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE_MASK (3 << 14)
> +#define MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE(x) ((x) << 14)
> +#define MG_MISC_SUS0_CFG_TR2PWR_GATING (1 << 12)
> +#define MG_MISC_SUS0_CFG_CL2PWR_GATING (1 << 11)
> +#define MG_MISC_SUS0_CFG_GAONPWR_GATING (1 << 10)
> +#define MG_MISC_SUS0_CFG_TRPWR_GATING (1 << 7)
> +#define MG_MISC_SUS0_CFG_CL1PWR_GATING (1 << 6)
> +#define MG_MISC_SUS0_CFG_DGPWR_GATING (1 << 5)
> +
>
> /* The spec defines this only for BXT PHY0, but lets assume that this
> * would exist for PHY1 too if it had a second channel.
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index c3c29565b863..6617950a28a9 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2668,6 +2668,7 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
> intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
>
> icl_program_mg_dp_mode(intel_dp);
> + icl_disable_phy_clock_gating(dig_port);
>
> if (IS_ICELAKE(dev_priv))
> icl_ddi_vswing_sequence(encoder, level, encoder->type);
> @@ -2684,6 +2685,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
> intel_dp_start_link_train(intel_dp);
> if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
> intel_dp_stop_link_train(intel_dp);
> +
> + icl_enable_phy_clock_gating(dig_port);
> }
>
> static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 1228d6185f76..e898d61b5924 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -295,6 +295,72 @@ void icl_program_mg_dp_mode(struct intel_dp *intel_dp)
> I915_WRITE(MG_DP_MODE(port, 1), ln1);
> }
>
> +void icl_enable_phy_clock_gating(struct intel_digital_port *dig_port)
> +{
> + struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> + enum port port = dig_port->base.port;
> + enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
> + i915_reg_t mg_regs[2] = { MG_DP_MODE(port, 0), MG_DP_MODE(port, 1) };
> + u32 val;
> + int i;
> +
> + if (tc_port == PORT_TC_NONE)
> + return;
> +
> + for (i = 0; i < ARRAY_SIZE(mg_regs); i++) {
> + val = I915_READ(mg_regs[i]);
> + val |= MG_DP_MODE_CFG_TR2PWR_GATING |
> + MG_DP_MODE_CFG_TRPWR_GATING |
> + MG_DP_MODE_CFG_CLNPWR_GATING |
> + MG_DP_MODE_CFG_DIGPWR_GATING |
> + MG_DP_MODE_CFG_GAONPWR_GATING;
> + I915_WRITE(mg_regs[i], val);
> + }
> +
> + val = I915_READ(MG_MISC_SUS0(tc_port));
> + val |= MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE(3) |
> + 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;
> + I915_WRITE(MG_MISC_SUS0(tc_port), val);
> +}
> +
> +void icl_disable_phy_clock_gating(struct intel_digital_port *dig_port)
> +{
> + struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> + enum port port = dig_port->base.port;
> + enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
> + i915_reg_t mg_regs[2] = { MG_DP_MODE(port, 0), MG_DP_MODE(port, 1) };
> + u32 val;
> + int i;
> +
> + if (tc_port == PORT_TC_NONE)
> + return;
> +
> + for (i = 0; i < ARRAY_SIZE(mg_regs); i++) {
> + val = I915_READ(mg_regs[i]);
> + val &= ~(MG_DP_MODE_CFG_TR2PWR_GATING |
> + MG_DP_MODE_CFG_TRPWR_GATING |
> + MG_DP_MODE_CFG_CLNPWR_GATING |
> + MG_DP_MODE_CFG_DIGPWR_GATING |
> + MG_DP_MODE_CFG_GAONPWR_GATING);
> + I915_WRITE(mg_regs[i], val);
> + }
> +
> + val = I915_READ(MG_MISC_SUS0(tc_port));
> + val &= ~(MG_MISC_SUS0_SUSCLK_DYNCLKGATE_MODE_MASK |
> + 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);
> + I915_WRITE(MG_MISC_SUS0(tc_port), val);
> +}
> +
> int
> intel_dp_max_data_rate(int max_link_clock, int max_lanes)
> {
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index d04be4c1f30e..8c77e0499b44 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1703,6 +1703,8 @@ void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
> void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
> unsigned int frontbuffer_bits);
> void icl_program_mg_dp_mode(struct intel_dp *intel_dp);
> +void icl_enable_phy_clock_gating(struct intel_digital_port *dig_port);
> +void icl_disable_phy_clock_gating(struct intel_digital_port *dig_port);
>
> void
> intel_dp_program_link_training_pattern(struct intel_dp *intel_dp,
Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
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