On Wed, 10 Jul 2019 21:47:52 +0300
Ville Syrjälä <ville.syrj...@linux.intel.com> wrote:
Hi Ville,
> On Wed, Jul 03, 2019 at 04:03:53PM -0700, Vivek Kasireddy wrote:
> > 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.
> >
> > v10: rebase
> >
> > 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 | 47
> > +++++++++++++++++-- drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> > | 6 +++ 5 files changed, 60 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c index
> > 919f5ac844c8..557462208462 100644 ---
> > a/drivers/gpu/drm/i915/display/intel_display.c +++
> > b/drivers/gpu/drm/i915/display/intel_display.c @@ -16653,6
> > +16653,13 @@ 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
> > c19b958461ca..7437fc71d289 100644 ---
> > a/drivers/gpu/drm/i915/display/intel_display_power.c +++
> > b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -118,6
> > +118,8 @@ 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 "?";
> > @@ -2455,6 +2457,7 @@ 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
> > f953971e7c3b..67cfe836286e 100644 ---
> > a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c +++
> > b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c @@ -2905,6 +2905,9
> > @@ static bool icl_get_combo_phy_dpll(struct intel_atomic_state
> > *state, intel_atomic_get_new_crtc_state(state, crtc); struct
> > icl_port_dpll *port_dpll =
> > &crtc_state->icl_port_dplls[ICL_PORT_DPLL_DEFAULT];
> > + struct drm_i915_private *dev_priv =
> > to_i915(crtc->base.dev);
> > + enum port port = encoder->port;
> > + bool has_dpll4 = false;
> >
> > if (!icl_calc_dpll_state(crtc_state, encoder,
> > &port_dpll->hw_state)) { DRM_DEBUG_KMS("Could not calculate combo
> > PHY PLL state.\n"); @@ -2912,10 +2915,14 @@ static bool
> > icl_get_combo_phy_dpll(struct intel_atomic_state *state, return
> > false; }
> >
> > + if (IS_ELKHARTLAKE(dev_priv) && port != PORT_A)
> > + has_dpll4 = true;
> > +
> > port_dpll->pll = intel_find_shared_dpll(state, crtc,
> > &port_dpll->hw_state,
> > DPLL_ID_ICL_DPLL0,
> > - DPLL_ID_ICL_DPLL1);
> > + has_dpll4 ?
> > DPLL_ID_EHL_DPLL4
> > + :
> > DPLL_ID_ICL_DPLL1); if (!port_dpll->pll) {
> > DRM_DEBUG_KMS("No combo PHY PLL found for port
> > %c\n", port_name(encoder->port));
> > @@ -3119,8 +3126,14 @@ 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,
> > @@ -3231,6 +3244,19 @@ 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);
> > @@ -3326,7 +3352,19 @@ 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,
> > @@ -3406,6 +3444,7 @@ 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
> > 1668f8116908..4c2c5e93aff3 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) ({ \
> > @@ -118,6 +119,10 @@ 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,
>
> While looking at the TGL stuff I noticed that this ID seems to be
> wrong. We use this to generate the register offsets but the docs show
> the following:
>
> DPLL0_CFGCR0 0x164000
> DPLL1_CFGCR0 0x164080
> TBTPLL_CFGCR0 0x164100
> DPLL4_CFGCR0 0x164200
>
> So the DPLL4 accesses will now land on TBTPLL. The ID if DPLL4 should
> really be 4 I guess.
Yes, looks like it should be 4 indeed. However, I was wondering what is
the best way to address this issue. Simply changing the id to 4 isn't
going to work as there are many places in intel_dpll_mgr.c that assume
the dpll id to be the index in the dev_priv->shared_dplls array as
stated in the definition of dpll_info:
/**
* @id: unique indentifier for this DPLL; should match the
index in the
* dev_priv->shared_dplls array
*/
enum intel_dpll_id id;
Should I change all these places that make this assumption and fix them?
Or, should I just simply add an if condition around cr0 and cr1 accesses
in icl_dpll_write and icl_pll_get_hw_state?
Thanks,
Vivek
>
> > /**
> > * @DPLL_ID_ICL_TBTPLL: ICL TBT PLL
> > */
> > @@ -320,6 +325,7 @@ 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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