[PATCH 03/17] drm/i915/icl: implement the display init/uninit sequences

Paulo Zanoni
2018-01-23T19:05:50Z

This code is similar enough to the CNL code that I considered just
adding ICL support to the CNL function, but I think it's still
different enough, and having a function specific to ICL allows us to
more easily adapt code in case the spec changes more later.

We're still missing the power wells and the mbus code, so leave those
pieces with a FIXME comment while they're not here yet.

v2: Don't use _PICK, don't WARN_ON(1), don't forget the chicken bits.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 16 ++++++-
drivers/gpu/drm/i915/intel_runtime_pm.c | 82 ++++++++++++++++++++++++++++++++-
2 files changed, 94 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ebf6261d30fd..979bc06a59f4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1904,6 +1904,11 @@ enum i915_power_well_id {
#define CL_POWER_DOWN_ENABLE (1 << 4)
#define SUS_CLOCK_CONFIG (3 << 0)

+#define _ICL_PORT_CL_DW5_A 0x162014
+#define _ICL_PORT_CL_DW5_B 0x6C014
+#define ICL_PORT_CL_DW5(port) _MMIO((port == PORT_A) ? \
+ _ICL_PORT_CL_DW5_A : _ICL_PORT_CL_DW5_B)
+
#define _PORT_CL1CM_DW9_A 0x162024
#define _PORT_CL1CM_DW9_BC 0x6C024
#define IREF0RC_OFFSET_SHIFT 8
@@ -7126,8 +7131,9 @@ enum {
#define RESET_PCH_HANDSHAKE_ENABLE (1<<4)

#define GEN8_CHICKEN_DCPR_1 _MMIO(0x46430)
-#define SKL_SELECT_ALTERNATE_DC_EXIT (1<<30)
-#define MASK_WAKEMEM (1<<13)
+#define SKL_SELECT_ALTERNATE_DC_EXIT (1 << 30)
+#define MASK_WAKEMEM (1 << 13)
+#define CNL_DDI_CLOCK_REG_ACCESS_ON (1 << 7)

#define SKL_DFSM _MMIO(0x51000)
#define SKL_DFSM_CDCLK_LIMIT_MASK (3 << 23)
@@ -9696,4 +9702,10 @@ enum skl_power_gate {
#define MMCD_PCLA (1 << 31)
#define MMCD_HOTSPOT_EN (1 << 27)

+#define _ICL_PHY_MISC_A 0x64C00
+#define _ICL_PHY_MISC_B 0x64C04
+#define ICL_PHY_MISC(port) _MMIO((port == PORT_A) ? \
+ _ICL_PHY_MISC_A : _ICL_PHY_MISC_B)
+#define ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN (1 << 23)
+
#endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 73dd525d241a..2556db16c76a 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2882,6 +2882,80 @@ static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
I915_WRITE(CHICKEN_MISC_2, val);
}

+static void icl_display_core_init(struct drm_i915_private *dev_priv,
+ bool resume)
+{
+ enum port port;
+ u32 val;
+
+ gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+ /* 1. Enable PCH reset handshake. */
+ val = I915_READ(HSW_NDE_RSTWRN_OPT);
+ val |= RESET_PCH_HANDSHAKE_ENABLE;
+ I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
+
+ for (port = PORT_A; port <= PORT_B; port++) {
+ /* 2. Enable DDI combo PHY comp. */
+ val = I915_READ(ICL_PHY_MISC(port));
+ val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
+ I915_WRITE(ICL_PHY_MISC(port), val);
+
+ cnl_set_procmon_ref_values(dev_priv, port);
+
+ val = I915_READ(ICL_PORT_COMP_DW0(port));
+ val |= COMP_INIT;
+ I915_WRITE(ICL_PORT_COMP_DW0(port), val);
+
+ /* 3. Set power down enable. */
+ val = I915_READ(ICL_PORT_CL_DW5(port));
+ val |= CL_POWER_DOWN_ENABLE;
+ I915_WRITE(ICL_PORT_CL_DW5(port), val);
+ }
+
+ /* 4. Enable power well 1 (PG1) and aux IO power. */
+ /* FIXME: ICL power wells code not here yet. */
+
+ /* 5. Enable CDCLK. */
+ icl_init_cdclk(dev_priv);
+
+ /* 6. Enable DBUF. */
+ gen9_dbuf_enable(dev_priv);
+
+ /* 7. Setup MBUS. */
+ /* FIXME: MBUS code not here yet. */
+
+ /* 8. CHICKEN_DCPR_1 */
+ I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_READ(GEN8_CHICKEN_DCPR_1) |
+ CNL_DDI_CLOCK_REG_ACCESS_ON);
+}
+
+static void icl_display_core_uninit(struct drm_i915_private *dev_priv)
+{
+ enum port port;
+ u32 val;
+
+ gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+ /* 1. Disable all display engine functions -> aready done */
+
+ /* 2. Disable DBUF */
+ gen9_dbuf_disable(dev_priv);
+
+ /* 3. Disable CD clock */
+ icl_uninit_cdclk(dev_priv);
+
+ /* 4. Disable Power Well 1 (PG1) and Aux IO Power */
+ /* FIXME: ICL power wells code not here yet. */
+
+ /* 5. Disable Comp */
+ for (port = PORT_A; port <= PORT_B; port++) {
+ val = I915_READ(ICL_PHY_MISC(port));
+ val |= ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
+ I915_WRITE(ICL_PHY_MISC(port), val);
+ }
+}
+
static void chv_phy_control_init(struct drm_i915_private *dev_priv)
{
struct i915_power_well *cmn_bc =
@@ -3014,7 +3088,9 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)

power_domains->initializing = true;

- if (IS_CANNONLAKE(dev_priv)) {
+ if (IS_ICELAKE(dev_priv)) {
+ icl_display_core_init(dev_priv, resume);
+ } else if (IS_CANNONLAKE(dev_priv)) {
cnl_display_core_init(dev_priv, resume);
} else if (IS_GEN9_BC(dev_priv)) {
skl_display_core_init(dev_priv, resume);
@@ -3055,7 +3131,9 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv)
if (!i915_modparams.disable_power_well)
intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);

- if (IS_CANNONLAKE(dev_priv))
+ if (IS_ICELAKE(dev_priv))
+ icl_display_core_uninit(dev_priv);
+ else if (IS_CANNONLAKE(dev_priv))
cnl_display_core_uninit(dev_priv);
else if (IS_GEN9_BC(dev_priv))
skl_display_core_uninit(dev_priv);
--
2.14.3