[Intel-gfx] [PATCH 21/23] drm/i915/rkl: Handle HTI
Matt Roper
matthew.d.roper at intel.com
Fri May 1 17:07:46 UTC 2020
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 at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
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
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