drm/i915/mtl: MTL PICA hotplug detection
PICA is used for DP alt mode and TBT modes. Hotplug interruption is routed
from PICA chip to south display engine and from there to north display
engine. This patch adds functionality to enable hotplug detection for
all Type-C ports (4 ports available).
Differently from HPD in south display, PICA provides a dedicated HPD
control register for each supported port, so we loop over ports
ourselves instead of using intel_hpd_hotplug_enables() or
intel_get_hpd_pins().
BSpec: 49305, 55726, 65107, 65300
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230413212443.1504245-6-radhakrishna.sripada@intel.com
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9245572..de95e81 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4477,6 +4477,28 @@
#define GEN11_HOTPLUG_CTL_SHORT_DETECT(hpd_pin) (1 << (_HPD_PIN_TC(hpd_pin) * 4))
#define GEN11_HOTPLUG_CTL_NO_DETECT(hpd_pin) (0 << (_HPD_PIN_TC(hpd_pin) * 4))
+#define PICAINTERRUPT_ISR _MMIO(0x16FE50)
+#define PICAINTERRUPT_IMR _MMIO(0x16FE54)
+#define PICAINTERRUPT_IIR _MMIO(0x16FE58)
+#define PICAINTERRUPT_IER _MMIO(0x16FE5C)
+
+#define XELPDP_DP_ALT_HOTPLUG(hpd_pin) REG_BIT(16 + _HPD_PIN_TC(hpd_pin))
+#define XELPDP_DP_ALT_HOTPLUG_MASK REG_GENMASK(19, 16)
+
+#define XELPDP_AUX_TC(hpd_pin) REG_BIT(8 + _HPD_PIN_TC(hpd_pin))
+#define XELPDP_AUX_TC_MASK REG_GENMASK(11, 8)
+
+#define XELPDP_TBT_HOTPLUG(hpd_pin) REG_BIT(_HPD_PIN_TC(hpd_pin))
+#define XELPDP_TBT_HOTPLUG_MASK REG_GENMASK(3, 0)
+
+#define XELPDP_PORT_HOTPLUG_CTL(hpd_pin) _MMIO(0x16F270 + (_HPD_PIN_TC(hpd_pin) * 0x200))
+#define XELPDP_TBT_HOTPLUG_ENABLE REG_BIT(6)
+#define XELPDP_TBT_HPD_LONG_DETECT REG_BIT(5)
+#define XELPDP_TBT_HPD_SHORT_DETECT REG_BIT(4)
+#define XELPDP_DP_ALT_HOTPLUG_ENABLE REG_BIT(2)
+#define XELPDP_DP_ALT_HPD_LONG_DETECT REG_BIT(1)
+#define XELPDP_DP_ALT_HPD_SHORT_DETECT REG_BIT(0)
+
#define ILK_DISPLAY_CHICKEN2 _MMIO(0x42004)
/* Required on all Ironlake and Sandybridge according to the B-Spec. */
#define ILK_ELPIN_409_SELECT (1 << 25)
@@ -4762,7 +4784,8 @@
SDE_FDI_RXB_CPT | \
SDE_FDI_RXA_CPT)
-/* south display engine interrupt: ICP/TGP */
+/* south display engine interrupt: ICP/TGP/MTP */
+#define SDE_PICAINTERRUPT REG_BIT(31)
#define SDE_GMBUS_ICP (1 << 23)
#define SDE_TC_HOTPLUG_ICP(hpd_pin) REG_BIT(24 + _HPD_PIN_TC(hpd_pin))
#define SDE_TC_HOTPLUG_DG2(hpd_pin) REG_BIT(25 + _HPD_PIN_TC(hpd_pin)) /* sigh */
@@ -5116,6 +5139,12 @@
#define SOUTH_CHICKEN1 _MMIO(0xc2000)
#define FDIA_PHASE_SYNC_SHIFT_OVR 19
#define FDIA_PHASE_SYNC_SHIFT_EN 18
+#define INVERT_DDIE_HPD REG_BIT(28)
+#define INVERT_DDID_HPD_MTP REG_BIT(27)
+#define INVERT_TC4_HPD REG_BIT(26)
+#define INVERT_TC3_HPD REG_BIT(25)
+#define INVERT_TC2_HPD REG_BIT(24)
+#define INVERT_TC1_HPD REG_BIT(23)
#define INVERT_DDID_HPD (1 << 18)
#define INVERT_DDIC_HPD (1 << 17)
#define INVERT_DDIB_HPD (1 << 16)
