On Tue, 2020-06-16 at 20:30 -0700, Matt Roper wrote:
> If HTI (also sometimes called HDPORT) is enabled at startup, it may be
> using some of the PHYs and DPLLs making them unavailable for general
> usage. Let's read out the HDPORT_STATE register and avoid making use of
> resources that HTI is already using.
>
> v2:
> - Fix minor checkpatch warnings
>
> Bspec: 49189
> Bspec: 53707
> Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 30 ++++++++++++++++---
> drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 21 +++++++++++++
> drivers/gpu/drm/i915/display/intel_dpll_mgr.h | 1 +
> drivers/gpu/drm/i915/i915_drv.h | 3 ++
> drivers/gpu/drm/i915/i915_reg.h | 6 ++++
> 5 files changed, 57 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 6c2bb3354b86..f16512eddc58 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -46,6 +46,7 @@
> #include "display/intel_ddi.h"
> #include "display/intel_dp.h"
> #include "display/intel_dp_mst.h"
> +#include "display/intel_dpll_mgr.h"
> #include "display/intel_dsi.h"
> #include "display/intel_dvo.h"
> #include "display/intel_gmbus.h"
> @@ -16814,6 +16815,13 @@ static void intel_pps_init(struct drm_i915_private *dev_priv)
> intel_pps_unlock_regs_wa(dev_priv);
> }
>
> +static bool hti_uses_phy(u32 hdport_state, enum phy phy)
> +{
> + return hdport_state & HDPORT_ENABLED &&
> + (hdport_state & HDPORT_PHY_USED_DP(phy) ||
> + hdport_state & HDPORT_PHY_USED_HDMI(phy));
> +}
> +
> static void intel_setup_outputs(struct drm_i915_private *dev_priv)
> {
> struct intel_encoder *encoder;
> @@ -16825,10 +16833,22 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
> return;
>
> if (IS_ROCKETLAKE(dev_priv)) {
> - intel_ddi_init(dev_priv, PORT_A);
> - intel_ddi_init(dev_priv, PORT_B);
> - intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */
> - intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */
> + /*
> + * If HTI (aka HDPORT) is enabled at boot, it may have taken
> + * over some of the PHYs and made them unavailable to the
> + * driver. In that case we should skip initializing the
> + * corresponding outputs.
> + */
> + u32 hdport_state = intel_de_read(dev_priv, HDPORT_STATE);
> +
> + if (!hti_uses_phy(hdport_state, PHY_A))
> + intel_ddi_init(dev_priv, PORT_A);
> + if (!hti_uses_phy(hdport_state, PHY_B))
> + intel_ddi_init(dev_priv, PORT_B);
> + if (!hti_uses_phy(hdport_state, PHY_C))
> + intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */
> + if (!hti_uses_phy(hdport_state, PHY_D))
> + intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */
> } else if (INTEL_GEN(dev_priv) >= 12) {
> intel_ddi_init(dev_priv, PORT_A);
> intel_ddi_init(dev_priv, PORT_B);
> @@ -18376,6 +18396,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>
> intel_dpll_readout_hw_state(dev_priv);
>
> + dev_priv->hti_pll_mask = intel_get_hti_plls(dev_priv);
Why not do this in intel_shared_dpll_init()?
> +
> for_each_intel_encoder(dev, encoder) {
> pipe = 0;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index b5f4d4cef682..6f59f9ec453b 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -265,6 +265,24 @@ void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
> mutex_unlock(&dev_priv->dpll.lock);
> }
>
> +/*
> + * HTI (aka HDPORT) may be using some of the platform's PLL's, making them
> + * unavailable for use.
> + */
> +u32 intel_get_hti_plls(struct drm_i915_private *dev_priv)
No need to export this function, check above.
> +{
> + u32 hdport_state;
> +
> + if (!IS_ROCKETLAKE(dev_priv))
> + return 0;
> +
> + hdport_state = intel_de_read(dev_priv, HDPORT_STATE);
> + if (!(hdport_state & HDPORT_ENABLED))
> + return 0;
> +
> + return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, hdport_state);
> +}
> +
> static struct intel_shared_dpll *
> intel_find_shared_dpll(struct intel_atomic_state *state,
> const struct intel_crtc *crtc,
> @@ -280,6 +298,9 @@ intel_find_shared_dpll(struct intel_atomic_state *state,
>
> drm_WARN_ON(&dev_priv->drm, dpll_mask & ~(BIT(I915_NUM_PLLS) - 1));
>
> + /* Eliminate DPLLs from consideration if reserved by HTI */
> + dpll_mask &= ~dev_priv->hti_pll_mask;
This should be done in icl_get_combo_phy_dpll() for RKL only.
> +
> for_each_set_bit(i, &dpll_mask, I915_NUM_PLLS) {
> pll = &dev_priv->dpll.shared_dplls[i];
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> index 49367847bfb5..edcc43f4670f 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> @@ -390,6 +390,7 @@ void intel_shared_dpll_swap_state(struct intel_atomic_state *state);
> void intel_shared_dpll_init(struct drm_device *dev);
> void intel_dpll_readout_hw_state(struct drm_i915_private *dev_priv);
> void intel_dpll_sanitize_state(struct drm_i915_private *dev_priv);
> +u32 intel_get_hti_plls(struct drm_i915_private *dev_priv);
>
> void intel_dpll_dump_hw_state(struct drm_i915_private *dev_priv,
> const struct intel_dpll_hw_state *hw_state);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 5649f8e502fe..b836032fa0de 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1037,6 +1037,9 @@ struct drm_i915_private {
>
> struct intel_l3_parity l3_parity;
>
> + /* Mask of PLLs reserved for use by HTI and unavailable to driver. */
> + u32 hti_pll_mask;
> +
> /*
> * edram size in MB.
> * Cannot be determined by PCIID. You must always read a register.
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 34f8698ac3aa..34b2ec04ccd8 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2908,6 +2908,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define MBUS_BBOX_CTL_S1 _MMIO(0x45040)
> #define MBUS_BBOX_CTL_S2 _MMIO(0x45044)
>
> +#define HDPORT_STATE _MMIO(0x45050)
> +#define HDPORT_DPLL_USED_MASK REG_GENMASK(14, 12)
> +#define HDPORT_PHY_USED_DP(phy) REG_BIT(2 * (phy) + 2)
> +#define HDPORT_PHY_USED_HDMI(phy) REG_BIT(2 * (phy) + 1)
> +#define HDPORT_ENABLED REG_BIT(0)
> +
> /* Make render/texture TLB fetches lower priorty than associated data
> * fetches. This is not turned on by default
> */
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