If HTI (also sometimes called HDPORT) is enabled at startup, it may be
using some of the PHYs and DPLLs making them unavailable for general
usage. Let's read out the HDPORT_STATE register and avoid making use of
resources that HTI is already using.
Bspec: 49189
Bspec: 53707
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 30 ++++++++++++++++---
drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 22 ++++++++++++++
drivers/gpu/drm/i915/display/intel_dpll_mgr.h | 1 +
drivers/gpu/drm/i915/i915_drv.h | 3 ++
drivers/gpu/drm/i915/i915_reg.h | 6 ++++
5 files changed, 58 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 87defd30af1f..5d2919adb5f3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -46,6 +46,7 @@
#include "display/intel_ddi.h"
#include "display/intel_dp.h"
#include "display/intel_dp_mst.h"
+#include "display/intel_dpll_mgr.h"
#include "display/intel_dsi.h"
#include "display/intel_dvo.h"
#include "display/intel_gmbus.h"
@@ -16688,6 +16689,13 @@ static void intel_pps_init(struct drm_i915_private *dev_priv)
intel_pps_unlock_regs_wa(dev_priv);
}
+static bool hti_uses_phy(u32 hdport_state, enum phy phy)
+{
+ return hdport_state & HDPORT_ENABLED &&
+ (hdport_state & HDPORT_PHY_USED_DP(phy) ||
+ hdport_state & HDPORT_PHY_USED_HDMI(phy));
+}
+
static void intel_setup_outputs(struct drm_i915_private *dev_priv)
{
struct intel_encoder *encoder;
@@ -16699,10 +16707,22 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
return;
if (IS_ROCKETLAKE(dev_priv)) {
- intel_ddi_init(dev_priv, PORT_A);
- intel_ddi_init(dev_priv, PORT_B);
- intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */
- intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */
+ /*
+ * If HTI (aka HDPORT) is enabled at boot, it may have taken
+ * over some of the PHYs and made them unavailable to the
+ * driver. In that case we should skip initializing the
+ * corresponding outputs.
+ */
+ u32 hdport_state = intel_de_read(dev_priv, HDPORT_STATE);
+
+ if (!hti_uses_phy(hdport_state, PHY_A))
+ intel_ddi_init(dev_priv, PORT_A);
+ if (!hti_uses_phy(hdport_state, PHY_B))
+ intel_ddi_init(dev_priv, PORT_B);
+ if (!hti_uses_phy(hdport_state, PHY_C))
+ intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */
+ if (!hti_uses_phy(hdport_state, PHY_D))
+ intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */
} else if (INTEL_GEN(dev_priv) >= 12) {
intel_ddi_init(dev_priv, PORT_A);
intel_ddi_init(dev_priv, PORT_B);
@@ -18221,6 +18241,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
intel_dpll_readout_hw_state(dev_priv);
+ dev_priv->hti_pll_mask = intel_get_hti_plls(dev_priv);
+
for_each_intel_encoder(dev, encoder) {
pipe = 0;
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 196d9eb3a77b..f8078a288379 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -265,6 +265,25 @@ void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
mutex_unlock(&dev_priv->dpll.lock);
}
+/*
+ * HTI (aka HDPORT) may be using some of the platform's PLL's, making them
+ * unavailable for use.
+ */
+u32 intel_get_hti_plls(struct drm_i915_private *dev_priv)
+{
+
+ u32 hdport_state;
+
+ if (!IS_ROCKETLAKE(dev_priv))
+ return 0;
+
+ hdport_state = intel_de_read(dev_priv, HDPORT_STATE);
+ if (!(hdport_state & HDPORT_ENABLED))
+ return 0;
+
+ return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, hdport_state);
+}
+
static struct intel_shared_dpll *
intel_find_shared_dpll(struct intel_atomic_state *state,
const struct intel_crtc *crtc,
@@ -280,6 +299,9 @@ intel_find_shared_dpll(struct intel_atomic_state *state,
drm_WARN_ON(&dev_priv->drm, dpll_mask & ~(BIT(I915_NUM_PLLS) - 1));
+ /* Eliminate DPLLs from consideration if reserved by HTI */
+ dpll_mask &= ~dev_priv->hti_pll_mask;
+
for_each_set_bit(i, &dpll_mask, I915_NUM_PLLS) {
pll = &dev_priv->dpll.shared_dplls[i];
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
index 5d9a2bc371e7..ac2238646fe7 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
@@ -390,6 +390,7 @@ void intel_shared_dpll_swap_state(struct intel_atomic_state *state);
void intel_shared_dpll_init(struct drm_device *dev);
void intel_dpll_readout_hw_state(struct drm_i915_private *dev_priv);
void intel_dpll_sanitize_state(struct drm_i915_private *dev_priv);
+u32 intel_get_hti_plls(struct drm_i915_private *dev_priv);
void intel_dpll_dump_hw_state(struct drm_i915_private *dev_priv,
const struct intel_dpll_hw_state *hw_state);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1ba77283123d..06802f2f1cd5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1025,6 +1025,9 @@ struct drm_i915_private {
struct intel_l3_parity l3_parity;
+ /* Mask of PLLs reserved for use by HTI and unavailable to driver. */
+ u32 hti_pll_mask;
+
/*
* edram size in MB.
* Cannot be determined by PCIID. You must always read a register.
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 42941b01710d..6df2e7f758e3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2898,6 +2898,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define MBUS_BBOX_CTL_S1 _MMIO(0x45040)
#define MBUS_BBOX_CTL_S2 _MMIO(0x45044)
+#define HDPORT_STATE _MMIO(0x45050)
+#define HDPORT_DPLL_USED_MASK REG_GENMASK(14, 12)
+#define HDPORT_PHY_USED_DP(phy) REG_BIT(2*phy + 2)
+#define HDPORT_PHY_USED_HDMI(phy) REG_BIT(2*phy + 1)
+#define HDPORT_ENABLED REG_BIT(0)
+
/* Make render/texture TLB fetches lower priorty than associated data
* fetches. This is not turned on by default
*/
--
2.24.1
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
