[PATCH] drm/i915: Only enable DDI IO power domains after enabling DPLL

[Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>]

According to bspec, the DDI IO power domains should be enabled after
enabling the DPLL and mapping it to the DDI. The current order doesn't
seem to create problems with Skylake and Kabylake, but causes enable
timeouts in Geminilake.

v2: Rebase.
  - Take power domain references before sanitizing encoders. (Imre)
  - Add comment to get_encoder_power_domains() defition. (Ander)

v3: Don't put the domain if called with HSW/BDW's analog encoder. (CI)

v4: Put IO power domain before unmapping DPLL. (Imre)
  - Change return type of intel_ddi_get_power_domains() to u64. (Imre)

Cc: David Weinehall <david.weinehall@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com> # v1
Reviewed-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  5 +++
 drivers/gpu/drm/i915/intel_ddi.c        | 49 ++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_display.c    | 20 ++++++++++
 drivers/gpu/drm/i915/intel_drv.h        |  4 ++
 drivers/gpu/drm/i915/intel_runtime_pm.c | 68 +++++++++++++++++++--------------
 5 files changed, 117 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4673912..5a032ba 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -344,6 +344,11 @@ enum intel_display_power_domain {
 	POWER_DOMAIN_PORT_DDI_C_LANES,
 	POWER_DOMAIN_PORT_DDI_D_LANES,
 	POWER_DOMAIN_PORT_DDI_E_LANES,
+	POWER_DOMAIN_PORT_DDI_A_IO,
+	POWER_DOMAIN_PORT_DDI_B_IO,
+	POWER_DOMAIN_PORT_DDI_C_IO,
+	POWER_DOMAIN_PORT_DDI_D_IO,
+	POWER_DOMAIN_PORT_DDI_E_IO,
 	POWER_DOMAIN_PORT_DSI,
 	POWER_DOMAIN_PORT_CRT,
 	POWER_DOMAIN_PORT_OTHER,
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index b0c4d23..e9013f1 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1440,6 +1440,17 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
 	return ret;
 }
 
+static u64 intel_ddi_get_power_domains(struct intel_encoder *encoder)
+{
+	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
+	enum pipe pipe;
+
+	if (intel_ddi_get_hw_state(encoder, &pipe))
+		return BIT_ULL(dig_port->ddi_io_power_domain);
+
+	return 0;
+}
+
 void intel_ddi_enable_pipe_clock(struct intel_crtc *intel_crtc)
 {
 	struct drm_crtc *crtc = &intel_crtc->base;
@@ -1682,6 +1693,7 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	enum port port = intel_ddi_get_encoder_port(encoder);
+	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
 
 	intel_dp_set_link_params(intel_dp, link_rate, lane_count,
 				 link_mst);
@@ -1689,6 +1701,9 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
 		intel_edp_panel_on(intel_dp);
 
 	intel_ddi_clk_select(encoder, pll);
+
+	intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
+
 	intel_prepare_dp_ddi_buffers(encoder);
 	intel_ddi_init_dp_buf_reg(encoder);
 	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
@@ -1708,9 +1723,13 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
 	struct drm_encoder *drm_encoder = &encoder->base;
 	enum port port = intel_ddi_get_encoder_port(encoder);
 	int level = intel_ddi_hdmi_level(dev_priv, port);
+	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
 
 	intel_dp_dual_mode_set_tmds_output(intel_hdmi, true);
 	intel_ddi_clk_select(encoder, pll);
+
+	intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
+
 	intel_prepare_hdmi_ddi_buffers(encoder);
 	if (IS_GEN9_BC(dev_priv))
 		skl_ddi_set_iboost(encoder, level);
@@ -1754,6 +1773,7 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
 	enum port port = intel_ddi_get_encoder_port(intel_encoder);
+	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
 	int type = intel_encoder->type;
 	uint32_t val;
 	bool wait = false;
@@ -1782,6 +1802,9 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 		intel_edp_panel_off(intel_dp);
 	}
 
+	if (dig_port)
+		intel_display_power_put(dev_priv, dig_port->ddi_io_power_domain);
+
 	if (IS_GEN9_BC(dev_priv))
 		I915_WRITE(DPLL_CTRL2, (I915_READ(DPLL_CTRL2) |
 					DPLL_CTRL2_DDI_CLK_OFF(port)));
@@ -2190,12 +2213,38 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	intel_encoder->get_hw_state = intel_ddi_get_hw_state;
 	intel_encoder->get_config = intel_ddi_get_config;
 	intel_encoder->suspend = intel_dp_encoder_suspend;
+	intel_encoder->get_power_domains = intel_ddi_get_power_domains;
 
 	intel_dig_port->port = port;
 	intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
 					  (DDI_BUF_PORT_REVERSAL |
 					   DDI_A_4_LANES);
 
+	switch (port) {
+	case PORT_A:
+		intel_dig_port->ddi_io_power_domain =
+			POWER_DOMAIN_PORT_DDI_A_IO;
+		break;
+	case PORT_B:
+		intel_dig_port->ddi_io_power_domain =
+			POWER_DOMAIN_PORT_DDI_B_IO;
+		break;
+	case PORT_C:
+		intel_dig_port->ddi_io_power_domain =
+			POWER_DOMAIN_PORT_DDI_C_IO;
+		break;
+	case PORT_D:
+		intel_dig_port->ddi_io_power_domain =
+			POWER_DOMAIN_PORT_DDI_D_IO;
+		break;
+	case PORT_E:
+		intel_dig_port->ddi_io_power_domain =
+			POWER_DOMAIN_PORT_DDI_E_IO;
+		break;
+	default:
+		MISSING_CASE(port);
+	}
+
 	/*
 	 * Bspec says that DDI_A_4_LANES is the only supported configuration
 	 * for Broxton.  Yet some BIOS fail to set this bit on port A if eDP
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 010086c..7673d5d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15413,6 +15413,24 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
 	}
 }
 
+static void
+get_encoder_power_domains(struct drm_i915_private *dev_priv)
+{
+	struct intel_encoder *encoder;
+
+	for_each_intel_encoder(&dev_priv->drm, encoder) {
+		u64 get_domains;
+		enum intel_display_power_domain domain;
+
+		if (!encoder->get_power_domains)
+			continue;
+
+		get_domains = encoder->get_power_domains(encoder);
+		for_each_power_domain(domain, get_domains)
+			intel_display_power_get(dev_priv, domain);
+	}
+}
+
 /* Scan out the current hw modeset state,
  * and sanitizes it to the current state
  */
@@ -15428,6 +15446,8 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
 	intel_modeset_readout_hw_state(dev);
 
 	/* HW state is read out, now we need to sanitize this mess. */
+	get_encoder_power_domains(dev_priv);
+
 	for_each_intel_encoder(dev, encoder) {
 		intel_sanitize_encoder(encoder);
 	}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 97621a1..0425dbe 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -241,6 +241,9 @@ struct intel_encoder {
 	 * be set correctly before calling this function. */
 	void (*get_config)(struct intel_encoder *,
 			   struct intel_crtc_state *pipe_config);
+	/* Returns a mask of power domains that need to be referenced as part
+	 * of the hardware state readout code. */
+	u64 (*get_power_domains)(struct intel_encoder *encoder);
 	/*
 	 * Called during system suspend after all pending requests for the
 	 * encoder are flushed (for example for DP AUX transactions) and
@@ -1027,6 +1030,7 @@ struct intel_digital_port {
 	enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
 	bool release_cl2_override;
 	uint8_t max_lanes;
+	enum intel_display_power_domain ddi_io_power_domain;
 };
 
 struct intel_dp_mst_encoder {
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 514ef56..012bc35 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -93,6 +93,16 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
 		return "PORT_DDI_D_LANES";
 	case POWER_DOMAIN_PORT_DDI_E_LANES:
 		return "PORT_DDI_E_LANES";
+	case POWER_DOMAIN_PORT_DDI_A_IO:
+		return "PORT_DDI_A_IO";
+	case POWER_DOMAIN_PORT_DDI_B_IO:
+		return "PORT_DDI_B_IO";
+	case POWER_DOMAIN_PORT_DDI_C_IO:
+		return "PORT_DDI_C_IO";
+	case POWER_DOMAIN_PORT_DDI_D_IO:
+		return "PORT_DDI_D_IO";
+	case POWER_DOMAIN_PORT_DDI_E_IO:
+		return "PORT_DDI_E_IO";
 	case POWER_DOMAIN_PORT_DSI:
 		return "PORT_DSI";
 	case POWER_DOMAIN_PORT_CRT:
@@ -385,18 +395,18 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv,
 	BIT_ULL(POWER_DOMAIN_AUDIO) |			\
 	BIT_ULL(POWER_DOMAIN_VGA) |				\
 	BIT_ULL(POWER_DOMAIN_INIT))
-#define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_E_LANES) |		\
+#define SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO) |		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_E_IO) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
-#define SKL_DISPLAY_DDI_B_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |		\
+#define SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
-#define SKL_DISPLAY_DDI_C_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) |		\
+#define SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
-#define SKL_DISPLAY_DDI_D_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) |		\
+#define SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
 #define SKL_DISPLAY_DC_OFF_POWER_DOMAINS (		\
 	SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |		\
@@ -451,12 +461,12 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv,
 	BIT_ULL(POWER_DOMAIN_AUDIO) |			\
 	BIT_ULL(POWER_DOMAIN_VGA) |				\
 	BIT_ULL(POWER_DOMAIN_INIT))
-#define GLK_DISPLAY_DDI_A_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES))
-#define GLK_DISPLAY_DDI_B_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES))
-#define GLK_DISPLAY_DDI_C_POWER_DOMAINS (		\
-	BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES))
+#define GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO))
+#define GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO))
+#define GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS (		\
+	BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO))
 #define GLK_DPIO_CMN_A_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |		\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
@@ -2114,26 +2124,26 @@ static struct i915_power_well skl_power_wells[] = {
 		.id = SKL_DISP_PW_2,
 	},
 	{
-		.name = "DDI A/E power well",
-		.domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
+		.name = "DDI A/E IO power well",
+		.domains = SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_A_E,
 	},
 	{
-		.name = "DDI B power well",
-		.domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
+		.name = "DDI B IO power well",
+		.domains = SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_B,
 	},
 	{
-		.name = "DDI C power well",
-		.domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
+		.name = "DDI C IO power well",
+		.domains = SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_C,
 	},
 	{
-		.name = "DDI D power well",
-		.domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
+		.name = "DDI D IO power well",
+		.domains = SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_D,
 	},
@@ -2246,20 +2256,20 @@ static struct i915_power_well glk_power_wells[] = {
 		.id = GLK_DISP_PW_AUX_C,
 	},
 	{
-		.name = "DDI A power well",
-		.domains = GLK_DISPLAY_DDI_A_POWER_DOMAINS,
+		.name = "DDI A IO power well",
+		.domains = GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = GLK_DISP_PW_DDI_A,
 	},
 	{
-		.name = "DDI B power well",
-		.domains = GLK_DISPLAY_DDI_B_POWER_DOMAINS,
+		.name = "DDI B IO power well",
+		.domains = GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_B,
 	},
 	{
-		.name = "DDI C power well",
-		.domains = GLK_DISPLAY_DDI_C_POWER_DOMAINS,
+		.name = "DDI C IO power well",
+		.domains = GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS,
 		.ops = &skl_power_well_ops,
 		.id = SKL_DISP_PW_DDI_C,
 	},
-- 
2.9.3

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