[Intel-gfx] [PATCH v2 07/13] drm/i915/mtl: Enabling/disabling sequence Thunderbolt pll
Mika Kahola
mika.kahola at intel.com
Fri Apr 28 09:54:27 UTC 2023
Enabling and disabling sequence for Thunderbolt PLL.
Bspec: 64568
v2: Use intel_de_wait_for_register() (RK)
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
drivers/gpu/drm/i915/display/intel_cx0_phy.c | 135 ++++++++++++++++++-
drivers/gpu/drm/i915/display/intel_cx0_phy.h | 7 +-
drivers/gpu/drm/i915/display/intel_ddi.c | 4 +-
3 files changed, 138 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index 63d63c23647e..7a2bf624eba7 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -2609,8 +2609,8 @@ static u32 intel_cx0_get_pclk_pll_ack(u8 lane_mask)
return val;
}
-void intel_cx0pll_enable(struct intel_encoder *encoder,
- const struct intel_crtc_state *crtc_state)
+static void intel_cx0pll_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
enum phy phy = intel_port_to_phy(i915, encoder->port);
@@ -2685,7 +2685,86 @@ void intel_cx0pll_enable(struct intel_encoder *encoder,
intel_cx0_phy_transaction_end(encoder, wakeref);
}
-void intel_cx0pll_disable(struct intel_encoder *encoder)
+static int intel_mtl_tbt_clock_select(struct drm_i915_private *i915, int clock)
+{
+ switch (clock) {
+ case 162000:
+ return XELPDP_DDI_CLOCK_SELECT_TBT_162;
+ case 270000:
+ return XELPDP_DDI_CLOCK_SELECT_TBT_270;
+ case 540000:
+ return XELPDP_DDI_CLOCK_SELECT_TBT_540;
+ case 810000:
+ return XELPDP_DDI_CLOCK_SELECT_TBT_810;
+ default:
+ MISSING_CASE(clock);
+ return XELPDP_DDI_CLOCK_SELECT_TBT_162;
+ }
+}
+
+static void intel_mtl_tbt_pll_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ enum phy phy = intel_port_to_phy(i915, encoder->port);
+ u32 val = 0;
+
+ /*
+ * 1. Program PORT_CLOCK_CTL REGISTER to configure
+ * clock muxes, gating and SSC
+ */
+ val |= XELPDP_DDI_CLOCK_SELECT(intel_mtl_tbt_clock_select(i915, crtc_state->port_clock));
+ val |= XELPDP_FORWARD_CLOCK_UNGATE;
+ intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+ XELPDP_DDI_CLOCK_SELECT_MASK | XELPDP_FORWARD_CLOCK_UNGATE, val);
+
+ /* 2. Read back PORT_CLOCK_CTL REGISTER */
+ val = intel_de_read(i915, XELPDP_PORT_CLOCK_CTL(encoder->port));
+
+ /*
+ * 3. Follow the Display Voltage Frequency Switching - Sequence
+ * Before Frequency Change. We handle this step in bxt_set_cdclk().
+ */
+
+ /*
+ * 4. Set PORT_CLOCK_CTL register TBT CLOCK Request to "1" to enable PLL.
+ */
+ val |= XELPDP_TBT_CLOCK_REQUEST;
+ intel_de_write(i915, XELPDP_PORT_CLOCK_CTL(encoder->port), val);
+
+ /* 5. Poll on PORT_CLOCK_CTL TBT CLOCK Ack == "1". */
+ if (__intel_de_wait_for_register(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+ XELPDP_TBT_CLOCK_ACK,
+ XELPDP_TBT_CLOCK_ACK,
+ 100, 0, NULL))
+ drm_warn(&i915->drm, "[ENCODER:%d:%s][%c] PHY PLL not locked after 100us.\n",
+ encoder->base.base.id, encoder->base.name, phy_name(phy));
+
+ /*
+ * 6. Follow the Display Voltage Frequency Switching Sequence After
+ * Frequency Change. We handle this step in bxt_set_cdclk().
+ */
+
+ /*
+ * 7. Program DDI_CLK_VALFREQ to match intended DDI
+ * clock frequency.
+ */
+ intel_de_write(i915, DDI_CLK_VALFREQ(encoder->port),
+ crtc_state->port_clock);
+}
+
+void intel_mtl_pll_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+
+ if (intel_tc_port_in_tbt_alt_mode(dig_port))
+ intel_mtl_tbt_pll_enable(encoder, crtc_state);
+ else
+ intel_cx0pll_enable(encoder, crtc_state);
+}
+
+static void intel_cx0pll_disable(struct intel_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
enum phy phy = intel_port_to_phy(i915, encoder->port);
@@ -2737,6 +2816,56 @@ void intel_cx0pll_disable(struct intel_encoder *encoder)
intel_cx0_phy_transaction_end(encoder, wakeref);
}
+static void intel_mtl_tbt_pll_disable(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ enum phy phy = intel_port_to_phy(i915, encoder->port);
+
+ /*
+ * 1. Follow the Display Voltage Frequency Switching Sequence Before
+ * Frequency Change. We handle this step in bxt_set_cdclk().
+ */
+
+ /*
+ * 2. Set PORT_CLOCK_CTL register TBT CLOCK Request to "0" to disable PLL.
+ */
+ intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+ XELPDP_TBT_CLOCK_REQUEST, 0);
+
+ /* 3. Poll on PORT_CLOCK_CTL TBT CLOCK Ack == "0". */
+ if (__intel_de_wait_for_register(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+ XELPDP_TBT_CLOCK_ACK,
+ ~XELPDP_TBT_CLOCK_ACK,
+ 10, 0, NULL))
+ drm_warn(&i915->drm, "[ENCODER:%d:%s][%c] PHY PLL not unlocked after 10us.\n",
+ encoder->base.base.id, encoder->base.name, phy_name(phy));
+
+ /*
+ * 4. Follow the Display Voltage Frequency Switching Sequence After
+ * Frequency Change. We handle this step in bxt_set_cdclk().
+ */
+
+ /*
+ * 5. Program PORT CLOCK CTRL register to disable and gate clocks
+ */
+ intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+ XELPDP_DDI_CLOCK_SELECT_MASK |
+ XELPDP_FORWARD_CLOCK_UNGATE, 0);
+
+ /* 6. Program DDI_CLK_VALFREQ to 0. */
+ intel_de_write(i915, DDI_CLK_VALFREQ(encoder->port), 0);
+}
+
+void intel_mtl_pll_disable(struct intel_encoder *encoder)
+{
+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+
+ if (intel_tc_port_in_tbt_alt_mode(dig_port))
+ intel_mtl_tbt_pll_disable(encoder);
+ else
+ intel_cx0pll_disable(encoder);
+}
+
void intel_c10pll_state_verify(struct intel_atomic_state *state,
struct intel_crtc_state *new_crtc_state)
{
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
index 83bd3500091b..9ea6310b6d79 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
@@ -19,9 +19,9 @@ struct intel_crtc_state;
enum phy;
bool intel_is_c10phy(struct drm_i915_private *dev_priv, enum phy phy);
-void intel_cx0pll_enable(struct intel_encoder *encoder,
- const struct intel_crtc_state *crtc_state);
-void intel_cx0pll_disable(struct intel_encoder *encoder);
+void intel_mtl_pll_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state);
+void intel_mtl_pll_disable(struct intel_encoder *encoder);
void intel_c10pll_readout_hw_state(struct intel_encoder *encoder, struct intel_c10pll_state *pll_state);
int intel_cx0pll_calc_state(struct intel_crtc_state *crtc_state, struct intel_encoder *encoder);
void intel_c10pll_dump_hw_state(struct drm_i915_private *dev_priv,
@@ -42,4 +42,5 @@ int intel_cx0_phy_check_hdmi_link_rate(struct intel_hdmi *hdmi, int clock);
void intel_cx0_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
u32 level);
+int intel_mtl_tbt_readout_hw_state(struct intel_encoder *encoder);
#endif /* __INTEL_CX0_PHY_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 8e6d6afca400..c18226edacac 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4779,8 +4779,8 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
encoder->pipe_mask = ~0;
if (DISPLAY_VER(dev_priv) >= 14) {
- encoder->enable_clock = intel_cx0pll_enable;
- encoder->disable_clock = intel_cx0pll_disable;
+ encoder->enable_clock = intel_mtl_pll_enable;
+ encoder->disable_clock = intel_mtl_pll_disable;
encoder->get_config = mtl_ddi_get_config;
} else if (IS_DG2(dev_priv)) {
encoder->enable_clock = intel_mpllb_enable;
--
2.34.1
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