[Intel-gfx] [PATCH v3] drm/i915/d12+: Disable DMC firmware flip queue handlers
Imre Deak
imre.deak at intel.com
Fri May 13 09:49:56 UTC 2022
Based on a bspec update the DMC firmware's flip queue handling events
need to be disabled before enabling DC5/6. i915 doesn't use the flip
queue feature atm, so disable it already after loading the firmware.
This removes some overhead of the event handler which runs at a 1 kHz
frequency.
Bspec: 49193, 72486, 72487
v2:
- Fix the DMC pipe A register offsets for GEN12.
- Disable the events on DG2 only on pipe A..D .
v3: (Lucas)
- Add TODO: to clarify the disabling sequence on all D13+
- s/intel_dmc_has_fw_payload/has_dmc_id_fw/
- s/simple_flipq/flipq/
- s/_GEN12,_GEN13/TGL_,ADLP_/
- s/MAINDMC/DMC/
Signed-off-by: Imre Deak <imre.deak at intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com> # v1
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
drivers/gpu/drm/i915/display/intel_dmc.c | 90 ++++++++++++++++++-
drivers/gpu/drm/i915/display/intel_dmc_regs.h | 41 +++++++++
2 files changed, 130 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index 2f01aca4d9810..7f50d697acaff 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -248,9 +248,14 @@ struct stepping_info {
char substepping;
};
+static bool has_dmc_id_fw(struct drm_i915_private *i915, int dmc_id)
+{
+ return i915->dmc.dmc_info[dmc_id].payload;
+}
+
bool intel_dmc_has_payload(struct drm_i915_private *i915)
{
- return i915->dmc.dmc_info[DMC_FW_MAIN].payload;
+ return has_dmc_id_fw(i915, DMC_FW_MAIN);
}
static const struct stepping_info *
@@ -272,6 +277,82 @@ static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
intel_de_posting_read(dev_priv, DC_STATE_DEBUG);
}
+static void
+disable_flip_queue_event(struct drm_i915_private *i915,
+ i915_reg_t ctl_reg, i915_reg_t htp_reg)
+{
+ u32 event_ctl;
+ u32 event_htp;
+
+ event_ctl = intel_de_read(i915, ctl_reg);
+ event_htp = intel_de_read(i915, htp_reg);
+ if (event_ctl != (DMC_EVT_CTL_ENABLE |
+ DMC_EVT_CTL_RECURRING |
+ REG_FIELD_PREP(DMC_EVT_CTL_TYPE_MASK,
+ DMC_EVT_CTL_TYPE_EDGE_0_1) |
+ REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
+ DMC_EVT_CTL_EVENT_ID_CLK_MSEC)) ||
+ !event_htp) {
+ drm_dbg_kms(&i915->drm,
+ "Unexpected DMC event configuration (control %08x htp %08x)\n",
+ event_ctl, event_htp);
+ return;
+ }
+
+ intel_de_write(i915, ctl_reg,
+ REG_FIELD_PREP(DMC_EVT_CTL_TYPE_MASK,
+ DMC_EVT_CTL_TYPE_EDGE_0_1) |
+ REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
+ DMC_EVT_CTL_EVENT_ID_FALSE));
+ intel_de_write(i915, htp_reg, 0);
+}
+
+static bool
+get_flip_queue_event_regs(struct drm_i915_private *i915, int dmc_id,
+ i915_reg_t *ctl_reg, i915_reg_t *htp_reg)
+{
+ switch (dmc_id) {
+ case DMC_FW_MAIN:
+ if (DISPLAY_VER(i915) == 12) {
+ *ctl_reg = DMC_EVT_CTL(i915, dmc_id, 3);
+ *htp_reg = DMC_EVT_HTP(i915, dmc_id, 3);
+
+ return true;
+ }
+ break;
+ case DMC_FW_PIPEA ... DMC_FW_PIPED:
+ /* TODO: check if the following applies to all D13+ platforms. */
+ if (IS_DG2(i915)) {
+ *ctl_reg = DMC_EVT_CTL(i915, dmc_id, 2);
+ *htp_reg = DMC_EVT_HTP(i915, dmc_id, 2);
+
+ return true;
+ }
+ break;
+ }
+
+ return false;
+}
+
+static void
+disable_all_flip_queue_events(struct drm_i915_private *i915)
+{
+ int dmc_id;
+
+ for (dmc_id = 0; dmc_id < DMC_FW_MAX; dmc_id++) {
+ i915_reg_t ctl_reg;
+ i915_reg_t htp_reg;
+
+ if (!has_dmc_id_fw(i915, dmc_id))
+ continue;
+
+ if (!get_flip_queue_event_regs(i915, dmc_id, &ctl_reg, &htp_reg))
+ continue;
+
+ disable_flip_queue_event(i915, ctl_reg, htp_reg);
+ }
+}
+
/**
* intel_dmc_load_program() - write the firmware from memory to register.
* @dev_priv: i915 drm device.
@@ -312,6 +393,13 @@ void intel_dmc_load_program(struct drm_i915_private *dev_priv)
dev_priv->dmc.dc_state = 0;
gen9_set_dc_state_debugmask(dev_priv);
+
+ /*
+ * Flip queue events need to be disabled before enabling DC5/6.
+ * i915 doesn't use the flip queue feature, so disable it already
+ * here.
+ */
+ disable_all_flip_queue_events(dev_priv);
}
void assert_dmc_loaded(struct drm_i915_private *i915)
diff --git a/drivers/gpu/drm/i915/display/intel_dmc_regs.h b/drivers/gpu/drm/i915/display/intel_dmc_regs.h
index d65e698832eb5..0a2401ced5ec3 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_dmc_regs.h
@@ -10,6 +10,47 @@
#define DMC_PROGRAM(addr, i) _MMIO((addr) + (i) * 4)
#define DMC_SSP_BASE_ADDR_GEN9 0x00002FC0
+
+#define _ADLP_PIPEDMC_REG_MMIO_BASE_A 0x5f000
+#define _TGL_PIPEDMC_REG_MMIO_BASE_A 0x92000
+
+#define __PIPEDMC_REG_MMIO_BASE(i915, dmc_id) \
+ ((DISPLAY_VER(i915) >= 13 ? _ADLP_PIPEDMC_REG_MMIO_BASE_A : \
+ _TGL_PIPEDMC_REG_MMIO_BASE_A) + \
+ 0x400 * ((dmc_id) - 1))
+
+#define __DMC_REG_MMIO_BASE 0x8f000
+
+#define _DMC_REG_MMIO_BASE(i915, dmc_id) \
+ ((dmc_id) == DMC_FW_MAIN ? __DMC_REG_MMIO_BASE : \
+ __PIPEDMC_REG_MMIO_BASE(i915, dmc_id))
+
+#define _DMC_REG(i915, dmc_id, reg) \
+ ((reg) - __DMC_REG_MMIO_BASE + _DMC_REG_MMIO_BASE(i915, dmc_id))
+
+#define _DMC_EVT_HTP_0 0x8f004
+
+#define DMC_EVT_HTP(i915, dmc_id, handler) \
+ _MMIO(_DMC_REG(i915, dmc_id, _DMC_EVT_HTP_0) + 4 * (handler))
+
+#define _DMC_EVT_CTL_0 0x8f034
+
+#define DMC_EVT_CTL(i915, dmc_id, handler) \
+ _MMIO(_DMC_REG(i915, dmc_id, _DMC_EVT_CTL_0) + 4 * (handler))
+
+#define DMC_EVT_CTL_ENABLE REG_BIT(31)
+#define DMC_EVT_CTL_RECURRING REG_BIT(30)
+#define DMC_EVT_CTL_TYPE_MASK REG_GENMASK(17, 16)
+#define DMC_EVT_CTL_TYPE_LEVEL_0 0
+#define DMC_EVT_CTL_TYPE_LEVEL_1 1
+#define DMC_EVT_CTL_TYPE_EDGE_1_0 2
+#define DMC_EVT_CTL_TYPE_EDGE_0_1 3
+
+#define DMC_EVT_CTL_EVENT_ID_MASK REG_GENMASK(15, 8)
+#define DMC_EVT_CTL_EVENT_ID_FALSE 0x01
+/* An event handler scheduled to run at a 1 kHz frequency. */
+#define DMC_EVT_CTL_EVENT_ID_CLK_MSEC 0xbf
+
#define DMC_HTP_ADDR_SKL 0x00500034
#define DMC_SSP_BASE _MMIO(0x8F074)
#define DMC_HTP_SKL _MMIO(0x8F004)
--
2.30.2
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