On Thu, 2020-07-16 at 15:05 -0700, Matt Roper wrote:
> After doing normal PHY-B initialization on Rocket Lake, we need to
> manually copy some additional PHY-A register values into PHY-B
> registers.
>
> Note that the bspec's combo phy page doesn't specify that this
> workaround is restricted to specific platform steppings (and doesn't
> even do a very good job of specifying that RKL is the only platform this
> is needed on), but the RKL workaround page lists this as relevant only
> for A and B steppings, so I'm trusting that information for now.
>
> v2: Make rkl_combo_phy_b_init_wa() static
>
> v3:
> - Minimize variables in WA function. (Jose)
> - Fix timeout duration (usec vs msec). (Jose)
> - Add verification of workaround. (Jose)
> - Fix stepping bounds in comment.
>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> Bspec: 49291
> Bspec: 53273
> Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_combo_phy.c | 50 +++++++++++++++++++
> drivers/gpu/drm/i915/i915_reg.h | 13 ++++-
> 2 files changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> index eccaa79cb4a9..d88f91038428 100644
> --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
> @@ -255,6 +255,26 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
> return phy == PHY_A;
> }
>
> +static bool verify_wa14011224835(struct drm_i915_private *i915)
> +{
> + u32 grccode, val;
> + bool ret = true;
> +
> + grccode = REG_FIELD_GET(GRCCODE,
> + intel_de_read(i915, ICL_PORT_COMP_DW6(PHY_A)));
> + val = REG_FIELD_PREP(IREF_RCAL_ORD, grccode);
> + ret &= check_phy_reg(i915, PHY_B, ICL_PORT_COMP_DW2(PHY_B),
> + IREF_RCAL_ORD, val);
> +
> + grccode = REG_FIELD_GET(GRCCODE_LDO,
> + intel_de_read(i915, ICL_PORT_COMP_DW0(PHY_A)));
> + val = REG_FIELD_PREP(RCOMPCODE_LD_CAP_OV, grccode);
> + ret &= check_phy_reg(i915, PHY_B, ICL_PORT_COMP_DW2(PHY_B),
> + IREF_RCAL_ORD, val);
> +
> + return ret;
> +}
> +
> static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
> enum phy phy)
> {
> @@ -295,6 +315,11 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
> ret &= check_phy_reg(dev_priv, phy, ICL_PORT_CL_DW5(phy),
> CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
>
> + /* Wa_14011224835:rkl[a0..b0] */
> + if (IS_RKL_REVID(dev_priv, RKL_REVID_A0, RKL_REVID_B0) &&
> + phy == PHY_B)
> + ret &= verify_wa14011224835(dev_priv);
> +
> return ret;
> }
>
> @@ -350,6 +375,26 @@ void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
> intel_de_write(dev_priv, ICL_PORT_CL_DW10(phy), val);
> }
>
> +static void rkl_combo_phy_b_init_wa(struct drm_i915_private *i915)
> +{
> + u32 grccode, val;
> +
> + wait_for_us(intel_de_read(i915, ICL_PORT_COMP_DW3(PHY_A)) &
> + FIRST_COMP_DONE, 100);
> +
> + grccode = REG_FIELD_GET(GRCCODE,
> + intel_de_read(i915, ICL_PORT_COMP_DW6(PHY_A)));
> + val = REG_FIELD_PREP(IREF_RCAL_ORD, grccode);
> + intel_de_rmw(i915, ICL_PORT_COMP_DW2(PHY_B), IREF_RCAL_ORD,
> + val | IREF_RCAL_ORD_EN);
> +
> + grccode = REG_FIELD_GET(GRCCODE_LDO,
> + intel_de_read(i915, ICL_PORT_COMP_DW0(PHY_A)));
> + val = REG_FIELD_PREP(RCOMPCODE_LD_CAP_OV, grccode);
> + intel_de_rmw(i915, ICL_PORT_COMP_DW6(PHY_B), RCOMPCODE_LD_CAP_OV,
> + val | RCOMPCODEOVEN_LDO_SYNC);
> +}
> +
> static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
> {
> enum phy phy;
> @@ -415,6 +460,11 @@ static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
> val = intel_de_read(dev_priv, ICL_PORT_CL_DW5(phy));
> val |= CL_POWER_DOWN_ENABLE;
> intel_de_write(dev_priv, ICL_PORT_CL_DW5(phy), val);
> +
> + if (IS_RKL_REVID(dev_priv, RKL_REVID_A0, RKL_REVID_B0) &&
> + phy == PHY_B)
> + /* Wa_14011224835:rkl[a0..b0] */
> + rkl_combo_phy_b_init_wa(dev_priv);
> }
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 89a9f2d8110e..a0d31f3bf634 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1911,11 +1911,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>
> #define CNL_PORT_COMP_DW0 _MMIO(0x162100)
> #define ICL_PORT_COMP_DW0(phy) _MMIO(_ICL_PORT_COMP_DW(0, phy))
> -#define COMP_INIT (1 << 31)
> +#define COMP_INIT REG_BIT(31)
> +#define GRCCODE_LDO REG_GENMASK(7, 0)
>
> #define CNL_PORT_COMP_DW1 _MMIO(0x162104)
> #define ICL_PORT_COMP_DW1(phy) _MMIO(_ICL_PORT_COMP_DW(1, phy))
>
> +#define ICL_PORT_COMP_DW2(phy) _MMIO(_ICL_PORT_COMP_DW(2, phy))
> +#define IREF_RCAL_ORD_EN REG_BIT(7)
> +#define IREF_RCAL_ORD REG_GENMASK(6, 0)
> +
> #define CNL_PORT_COMP_DW3 _MMIO(0x16210c)
> #define ICL_PORT_COMP_DW3(phy) _MMIO(_ICL_PORT_COMP_DW(3, phy))
> #define PROCESS_INFO_DOT_0 (0 << 26)
> @@ -1928,6 +1933,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define VOLTAGE_INFO_1_05V (2 << 24)
> #define VOLTAGE_INFO_MASK (3 << 24)
> #define VOLTAGE_INFO_SHIFT 24
> +#define FIRST_COMP_DONE REG_BIT(22)
> +
> +#define ICL_PORT_COMP_DW6(phy) _MMIO(_ICL_PORT_COMP_DW(6, phy))
> +#define GRCCODE REG_GENMASK(30, 24)
> +#define RCOMPCODEOVEN_LDO_SYNC REG_BIT(23)
> +#define RCOMPCODE_LD_CAP_OV REG_GENMASK(22, 16)
>
> #define ICL_PORT_COMP_DW8(phy) _MMIO(_ICL_PORT_COMP_DW(8, phy))
> #define IREFGEN (1 << 24)
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