drm/i915/mtl: Add Support for C10 PHY message bus and pll programming

XELPDP has C10 and C20 phys from Synopsys to drive displays. Each phy
has a dedicated PIPE 5.2 Message bus for configuration. This message
bus is used to configure the phy internal registers.

XELPDP has C10 phys to drive output to the EDP and the native output
from the display engine. Add structures, programming hardware state
readout logic. Port clock calculations are similar to DG2. Use the DG2
formulae to calculate the port clock but use the relevant pll signals.
Note: PHY lane 0 is always used for PLL programming.

Add sequences for C10 phy enable/disable phy lane reset,
powerdown change sequence and phy lane programming.

Bspec: 64539, 64568, 64599, 65100, 65101, 65450, 65451, 67610, 67636

v2: Squash patches related to C10 phy message bus and pll
    programming support (Jani)
    Move register definitions to a new file i.e. intel_cx0_reg_defs.h (Jani)
    Move macro definitions (Jani)
    DP rates as separate patch (Jani)
    Spin out xelpdp register definitions into a separate file (Jani)
    Replace macro to select registers based on phy lane with
    function calls (Jani)
    Fix styling issues (Jani)
    Call XELPDP_PORT_P2M_MSGBUS_STATUS() with port instead of phy (Lucas)
v3: Move clear request flag into try-loop
v4: On PHY idle change drm_err_once() as drm_dbg_kms() (Jani)
    use __intel_de_wait_for_register() instead of __intel_wait_for_register
    and uncomment intel_uncore.h (Jani)
    Add DP-alt support for PHY lane programming (Khaled)
v4: Add tx and cmn on c10mpllb_state (Imre)
    Add missing waits for pending transactions between two message bus
    writes (Imre)
    General cleanups and simplifications (Imre)
v5: Few nit cleanups from rev4 (imre)
    s/dev_priv/i915/ , s/c10mpllb/c10pll/ (RK)
    Rebase
v6: Move the mtl code from intel_c10pll_calc_port_clock to mtl function
    Fix typo in comment for REG_FIELD_PREP8 definition(Imre)

Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com> (v4)
Link: https://patchwork.freedesktop.org/patch/msgid/20230413212443.1504245-4-radhakrishna.sripada@intel.com

1 files changed, 32 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dpll.c b/drivers/gpu/drm/i915/display/intel_dpll.c
index 4e9c18be7e1f..a9fbef0fa817 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll.c
@@ -8,6 +8,7 @@
 
 #include "i915_reg.h"
 #include "intel_crtc.h"
+#include "intel_cx0_phy.h"
 #include "intel_de.h"
 #include "intel_display.h"
 #include "intel_display_types.h"
@@ -995,6 +996,30 @@ static int dg2_crtc_compute_clock(struct intel_atomic_state *state,
 	return 0;
 }
 
+static int mtl_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	int ret;
+
+	ret = intel_cx0pll_calc_state(crtc_state, encoder);
+	if (ret)
+		return ret;
+
+	/* TODO: Do the readback via intel_compute_shared_dplls() */
+	if (intel_is_c10phy(i915, phy))
+		crtc_state->port_clock = intel_c10pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10);
+
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
 static bool ilk_needs_fb_cb_tune(const struct dpll *dpll, int factor)
 {
 	return dpll->m < factor * dpll->n;
@@ -1423,6 +1448,10 @@ static int i8xx_crtc_compute_clock(struct intel_atomic_state *state,
 	return 0;
 }
 
+static const struct intel_dpll_funcs mtl_dpll_funcs = {
+	.crtc_compute_clock = mtl_crtc_compute_clock,
+};
+
 static const struct intel_dpll_funcs dg2_dpll_funcs = {
 	.crtc_compute_clock = dg2_crtc_compute_clock,
 };
@@ -1517,7 +1546,9 @@ int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
 void
 intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv)
 {
-	if (IS_DG2(dev_priv))
+	if (DISPLAY_VER(dev_priv) >= 14)
+		dev_priv->display.funcs.dpll = &mtl_dpll_funcs;
+	else if (IS_DG2(dev_priv))
 		dev_priv->display.funcs.dpll = &dg2_dpll_funcs;
 	else if (DISPLAY_VER(dev_priv) >= 9 || HAS_DDI(dev_priv))
 		dev_priv->display.funcs.dpll = &hsw_dpll_funcs;