This patch adds support for DPLL4 on EHL that include the
following restrictions:
- DPLL4 cannot be used with DDIA (combo port A internal eDP usage).
DPLL4 can be used with other DDIs, including DDID
(combo port A external usage).
- DPLL4 cannot be enabled when DC5 or DC6 are enabled.
- The DPLL4 enable, lock, power enabled, and power state are connected
to the MGPLL1_ENABLE register.
v2: (suggestions from Bob Paauwe)
- Rework ehl_get_dpll() function to call intel_find_shared_dpll() and
iterate twice: once for Combo plls and once for MG plls.
- Use MG pll funcs for DPLL4 instead of creating new ones and modify
mg_pll_enable to include the restrictions for EHL.
v3: Fix compilation error
v4: (suggestions from Lucas and Ville)
- Treat DPLL4 as a combo phy PLL and not as MG PLL
- Disable DC states when this DPLL is being enabled
- Reuse icl_get_dpll instead of creating a separate one for EHL
v5: (suggestion from Ville)
- Refcount the DC OFF power domains during the enabling and disabling
of this DPLL.
v6: rebase
v7: (suggestion from Imre)
- Add a new power domain instead of iterating over the domains
assoicated with DC OFF power well.
v8: (Ville and Imre)
- Rename POWER_DOMAIN_DPLL4 TO POWER_DOMAIN_DPLL_DC_OFF
- Grab a reference in intel_modeset_setup_hw_state() if this
DPLL was already enabled perhaps by BIOS.
- Check for the port type instead of the encoder
v9: (Ville)
- Move the block of code that grabs a reference to the power domain
POWER_DOMAIN_DPLL_DC_OFF to intel_modeset_readout_hw_state() to ensure
that there is a reference present before this DPLL might get disabled.
Cc: José Roberto de Souza <jose.so...@intel.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Matt Roper <matthew.d.ro...@intel.com>
Cc: Imre Deak <imre.d...@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasire...@intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 7 ++++
.../drm/i915/display/intel_display_power.c | 3 ++
.../drm/i915/display/intel_display_power.h | 1 +
drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 42 +++++++++++++++++--
drivers/gpu/drm/i915/display/intel_dpll_mgr.h | 6 +++
5 files changed, 56 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c
b/drivers/gpu/drm/i915/display/intel_display.c
index e55bd75528c1..3f1ff3bb5e36 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -16569,6 +16569,13 @@ static void intel_modeset_readout_hw_state(struct
drm_device *dev)
pll->on = pll->info->funcs->get_hw_state(dev_priv, pll,
&pll->state.hw_state);
+
+ if (IS_ELKHARTLAKE(dev_priv) && pll->on &&
+ pll->info->id == DPLL_ID_EHL_DPLL4) {
+ pll->wakeref = intel_display_power_get(dev_priv,
+
POWER_DOMAIN_DPLL_DC_OFF);
+ }
+
pll->state.crtc_mask = 0;
for_each_intel_crtc(dev, crtc) {
struct intel_crtc_state *crtc_state =
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
b/drivers/gpu/drm/i915/display/intel_display_power.c
index c93ad512014c..1c101a842331 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -117,6 +117,8 @@ intel_display_power_domain_str(enum
intel_display_power_domain domain)
return "MODESET";
case POWER_DOMAIN_GT_IRQ:
return "GT_IRQ";
+ case POWER_DOMAIN_DPLL_DC_OFF:
+ return "DPLL_DC_OFF";
default:
MISSING_CASE(domain);
return "?";
@@ -2361,6 +2363,7 @@ void intel_display_power_put(struct drm_i915_private
*dev_priv,
ICL_PW_2_POWER_DOMAINS | \
BIT_ULL(POWER_DOMAIN_MODESET) | \
BIT_ULL(POWER_DOMAIN_AUX_A) | \
+ BIT_ULL(POWER_DOMAIN_DPLL_DC_OFF) | \
BIT_ULL(POWER_DOMAIN_INIT))
#define ICL_DDI_IO_A_POWER_DOMAINS ( \
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h
b/drivers/gpu/drm/i915/display/intel_display_power.h
index ff57b0a7fe59..8f43f7051a16 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power.h
@@ -59,6 +59,7 @@ enum intel_display_power_domain {
POWER_DOMAIN_GMBUS,
POWER_DOMAIN_MODESET,
POWER_DOMAIN_GT_IRQ,
+ POWER_DOMAIN_DPLL_DC_OFF,
POWER_DOMAIN_INIT,
POWER_DOMAIN_NUM,
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 2d4e7b9a7b9d..81e1443cb583 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -2806,6 +2806,10 @@ icl_get_dpll(struct intel_crtc_state *crtc_state,
if (intel_port_is_combophy(dev_priv, port)) {
min = DPLL_ID_ICL_DPLL0;
max = DPLL_ID_ICL_DPLL1;
+
+ if (IS_ELKHARTLAKE(dev_priv) && port != PORT_A)
+ max = DPLL_ID_EHL_DPLL4;
+
ret = icl_calc_dpll_state(crtc_state, encoder);
} else if (intel_port_is_tc(dev_priv, port)) {
if (encoder->type == INTEL_OUTPUT_DP_MST) {
@@ -2945,8 +2949,14 @@ static bool combo_pll_get_hw_state(struct
drm_i915_private *dev_priv,
struct intel_shared_dpll *pll,
struct intel_dpll_hw_state *hw_state)
{
- return icl_pll_get_hw_state(dev_priv, pll, hw_state,
- CNL_DPLL_ENABLE(pll->info->id));
+ i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
+
+ if (IS_ELKHARTLAKE(dev_priv) &&
+ pll->info->id == DPLL_ID_EHL_DPLL4) {
+ enable_reg = MG_PLL_ENABLE(0);
+ }
+
+ return icl_pll_get_hw_state(dev_priv, pll, hw_state, enable_reg);
}
static bool tbt_pll_get_hw_state(struct drm_i915_private *dev_priv,
@@ -3057,6 +3067,19 @@ static void combo_pll_enable(struct drm_i915_private
*dev_priv,
{
i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
+ if (IS_ELKHARTLAKE(dev_priv) &&
+ pll->info->id == DPLL_ID_EHL_DPLL4) {
+ enable_reg = MG_PLL_ENABLE(0);
+
+ /*
+ * We need to disable DC states when this DPLL is enabled.
+ * This can be done by taking a reference on DPLL4 power
+ * domain.
+ */
+ pll->wakeref = intel_display_power_get(dev_priv,
+
POWER_DOMAIN_DPLL_DC_OFF);
+ }
+
icl_pll_power_enable(dev_priv, pll, enable_reg);
icl_dpll_write(dev_priv, pll);
@@ -3152,7 +3175,19 @@ static void icl_pll_disable(struct drm_i915_private
*dev_priv,
static void combo_pll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
- icl_pll_disable(dev_priv, pll, CNL_DPLL_ENABLE(pll->info->id));
+ i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
+
+ if (IS_ELKHARTLAKE(dev_priv) &&
+ pll->info->id == DPLL_ID_EHL_DPLL4) {
+ enable_reg = MG_PLL_ENABLE(0);
+ icl_pll_disable(dev_priv, pll, enable_reg);
+
+ intel_display_power_put(dev_priv, POWER_DOMAIN_DPLL_DC_OFF,
+ pll->wakeref);
+ return;
+ }
+
+ icl_pll_disable(dev_priv, pll, enable_reg);
}
static void tbt_pll_disable(struct drm_i915_private *dev_priv,
@@ -3230,6 +3265,7 @@ static const struct intel_dpll_mgr icl_pll_mgr = {
static const struct dpll_info ehl_plls[] = {
{ "DPLL 0", &combo_pll_funcs, DPLL_ID_ICL_DPLL0, 0 },
{ "DPLL 1", &combo_pll_funcs, DPLL_ID_ICL_DPLL1, 0 },
+ { "DPLL 4", &combo_pll_funcs, DPLL_ID_EHL_DPLL4, 0 },
{ },
};
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
index d0570414f3d1..3e2aa1099562 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
@@ -28,6 +28,7 @@
#include <linux/types.h>
#include "intel_display.h"
+#include "intel_wakeref.h"
/*FIXME: Move this to a more appropriate place. */
#define abs_diff(a, b) ({ \
@@ -117,6 +118,10 @@ enum intel_dpll_id {
* @DPLL_ID_ICL_DPLL1: ICL combo PHY DPLL1
*/
DPLL_ID_ICL_DPLL1 = 1,
+ /**
+ * @DPLL_ID_EHL_DPLL4: EHL combo PHY DPLL4
+ */
+ DPLL_ID_EHL_DPLL4 = 2,
/**
* @DPLL_ID_ICL_TBTPLL: ICL TBT PLL
*/
@@ -312,6 +317,7 @@ struct intel_shared_dpll {
* @info: platform specific info
*/
const struct dpll_info *info;
+ intel_wakeref_t wakeref;
};
#define SKL_DPLL0 0
--
2.21.0
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