[Intel-gfx] [PATCH v4 1/8] drm/i915: Consolidate bxt/cnl/icl cdclk readout
Ville Syrjälä
ville.syrjala at linux.intel.com
Tue Sep 10 15:46:44 UTC 2019
On Tue, Sep 10, 2019 at 08:42:45AM -0700, Matt Roper wrote:
> Aside from a few minor register changes and some different clock values,
> cdclk design hasn't changed much since gen9lp. Let's consolidate the
> handlers for bxt, cnl, and icl to keep the codeflow consistent.
>
> Also, while we're at it, s/bxt_de_pll_update/bxt_de_pll_readout/ since
> "update" makes me think we should be writing to hardware rather than
> reading from it.
>
> v2:
> - Fix icl_calc_voltage_level() limits. (Ville)
> - Use CNL_CDCLK_PLL_RATIO_MASK rather than BXT_DE_PLL_RATIO_MASK on
> gen10+ to avoid confusion. (Ville)
>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_cdclk.c | 325 +++++++++------------
> 1 file changed, 138 insertions(+), 187 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
> index d3e56628af70..01ed3262d91e 100644
> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> @@ -1190,6 +1190,36 @@ static u8 bxt_calc_voltage_level(int cdclk)
> return DIV_ROUND_UP(cdclk, 25000);
> }
>
> +static u8 cnl_calc_voltage_level(int cdclk)
> +{
> + if (cdclk > 336000)
> + return 2;
> + else if (cdclk > 168000)
> + return 1;
> + else
> + return 0;
> +}
> +
> +static u8 icl_calc_voltage_level(int cdclk)
> +{
> + if (cdclk > 556800)
> + return 2;
> + else if (cdclk > 312000)
> + return 1;
> + else
> + return 0;
> +}
> +
> +static u8 ehl_calc_voltage_level(int cdclk)
> +{
> + if (cdclk > 326400)
This still looks off.
> + return 2;
> + else if (cdclk > 180000)
> + return 1;
> + else
> + return 0;
> +}
> +
> static int bxt_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
> {
> int ratio;
> @@ -1236,23 +1266,69 @@ static int glk_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
> return dev_priv->cdclk.hw.ref * ratio;
> }
>
> -static void bxt_de_pll_update(struct drm_i915_private *dev_priv,
> - struct intel_cdclk_state *cdclk_state)
> +static void cnl_readout_refclk(struct drm_i915_private *dev_priv,
> + struct intel_cdclk_state *cdclk_state)
> {
> - u32 val;
> + if (I915_READ(SKL_DSSM) & CNL_DSSM_CDCLK_PLL_REFCLK_24MHz)
> + cdclk_state->ref = 24000;
> + else
> + cdclk_state->ref = 19200;
> +}
>
> - cdclk_state->ref = 19200;
> - cdclk_state->vco = 0;
> +static void icl_readout_refclk(struct drm_i915_private *dev_priv,
> + struct intel_cdclk_state *cdclk_state)
> +{
> + u32 dssm = I915_READ(SKL_DSSM) & ICL_DSSM_CDCLK_PLL_REFCLK_MASK;
> +
> + switch (dssm) {
> + default:
> + MISSING_CASE(dssm);
> + /* fall through */
> + case ICL_DSSM_CDCLK_PLL_REFCLK_24MHz:
> + cdclk_state->ref = 24000;
> + break;
> + case ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz:
> + cdclk_state->ref = 19200;
> + break;
> + case ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz:
> + cdclk_state->ref = 38400;
> + break;
> + }
> +}
> +
> +static void bxt_de_pll_readout(struct drm_i915_private *dev_priv,
> + struct intel_cdclk_state *cdclk_state)
> +{
> + u32 val, ratio;
> +
> + if (INTEL_GEN(dev_priv) >= 11)
> + icl_readout_refclk(dev_priv, cdclk_state);
> + else if (IS_CANNONLAKE(dev_priv))
> + cnl_readout_refclk(dev_priv, cdclk_state);
> + else
> + cdclk_state->ref = 19200;
>
> val = I915_READ(BXT_DE_PLL_ENABLE);
> - if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
> + if ((val & BXT_DE_PLL_PLL_ENABLE) == 0 ||
> + (val & BXT_DE_PLL_LOCK) == 0) {
> + /*
> + * CDCLK PLL is disabled, the VCO/ratio doesn't matter, but
> + * setting it to zero is a way to signal that.
> + */
> + cdclk_state->vco = 0;
> return;
> + }
>
> - if (WARN_ON((val & BXT_DE_PLL_LOCK) == 0))
> - return;
> + /*
> + * CNL+ have the ratio directly in the PLL enable register, gen9lp had
> + * it in a separate PLL control register.
> + */
> + if (INTEL_GEN(dev_priv) >= 10)
> + ratio = val & CNL_CDCLK_PLL_RATIO_MASK;
> + else
> + ratio = I915_READ(BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;
>
> - val = I915_READ(BXT_DE_PLL_CTL);
> - cdclk_state->vco = (val & BXT_DE_PLL_RATIO_MASK) * cdclk_state->ref;
> + cdclk_state->vco = ratio * cdclk_state->ref;
> }
>
> static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
> @@ -1261,12 +1337,18 @@ static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
> u32 divider;
> int div;
>
> - bxt_de_pll_update(dev_priv, cdclk_state);
> -
> - cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
> + if (INTEL_GEN(dev_priv) >= 12)
> + cdclk_state->bypass = cdclk_state->ref / 2;
> + else if (INTEL_GEN(dev_priv) >= 11)
> + cdclk_state->bypass = 50000;
> + else
> + cdclk_state->bypass = cdclk_state->ref;
>
> - if (cdclk_state->vco == 0)
> + bxt_de_pll_readout(dev_priv, cdclk_state);
> + if (cdclk_state->vco == 0) {
> + cdclk_state->cdclk = cdclk_state->bypass;
> goto out;
> + }
>
> divider = I915_READ(CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;
>
> @@ -1275,13 +1357,15 @@ static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
> div = 2;
> break;
> case BXT_CDCLK_CD2X_DIV_SEL_1_5:
> - WARN(IS_GEMINILAKE(dev_priv), "Unsupported divider\n");
> + WARN(IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10,
> + "Unsupported divider\n");
> div = 3;
> break;
> case BXT_CDCLK_CD2X_DIV_SEL_2:
> div = 4;
> break;
> case BXT_CDCLK_CD2X_DIV_SEL_4:
> + WARN(INTEL_GEN(dev_priv) >= 10, "Unsupported divider\n");
> div = 8;
> break;
> default:
> @@ -1296,8 +1380,18 @@ static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
> * Can't read this out :( Let's assume it's
> * at least what the CDCLK frequency requires.
> */
> - cdclk_state->voltage_level =
> - bxt_calc_voltage_level(cdclk_state->cdclk);
> + if (IS_ELKHARTLAKE(dev_priv))
> + cdclk_state->voltage_level =
> + ehl_calc_voltage_level(cdclk_state->cdclk);
> + else if (INTEL_GEN(dev_priv) >= 11)
> + cdclk_state->voltage_level =
> + icl_calc_voltage_level(cdclk_state->cdclk);
> + else if (INTEL_GEN(dev_priv) >= 10)
> + cdclk_state->voltage_level =
> + cnl_calc_voltage_level(cdclk_state->cdclk);
> + else
> + cdclk_state->voltage_level =
> + bxt_calc_voltage_level(cdclk_state->cdclk);
> }
>
> static void bxt_de_pll_disable(struct drm_i915_private *dev_priv)
> @@ -1515,76 +1609,6 @@ static int cnl_calc_cdclk(int min_cdclk)
> return 168000;
> }
>
> -static u8 cnl_calc_voltage_level(int cdclk)
> -{
> - if (cdclk > 336000)
> - return 2;
> - else if (cdclk > 168000)
> - return 1;
> - else
> - return 0;
> -}
> -
> -static void cnl_cdclk_pll_update(struct drm_i915_private *dev_priv,
> - struct intel_cdclk_state *cdclk_state)
> -{
> - u32 val;
> -
> - if (I915_READ(SKL_DSSM) & CNL_DSSM_CDCLK_PLL_REFCLK_24MHz)
> - cdclk_state->ref = 24000;
> - else
> - cdclk_state->ref = 19200;
> -
> - cdclk_state->vco = 0;
> -
> - val = I915_READ(BXT_DE_PLL_ENABLE);
> - if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
> - return;
> -
> - if (WARN_ON((val & BXT_DE_PLL_LOCK) == 0))
> - return;
> -
> - cdclk_state->vco = (val & CNL_CDCLK_PLL_RATIO_MASK) * cdclk_state->ref;
> -}
> -
> -static void cnl_get_cdclk(struct drm_i915_private *dev_priv,
> - struct intel_cdclk_state *cdclk_state)
> -{
> - u32 divider;
> - int div;
> -
> - cnl_cdclk_pll_update(dev_priv, cdclk_state);
> -
> - cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
> -
> - if (cdclk_state->vco == 0)
> - goto out;
> -
> - divider = I915_READ(CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;
> -
> - switch (divider) {
> - case BXT_CDCLK_CD2X_DIV_SEL_1:
> - div = 2;
> - break;
> - case BXT_CDCLK_CD2X_DIV_SEL_2:
> - div = 4;
> - break;
> - default:
> - MISSING_CASE(divider);
> - return;
> - }
> -
> - cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco, div);
> -
> - out:
> - /*
> - * Can't read this out :( Let's assume it's
> - * at least what the CDCLK frequency requires.
> - */
> - cdclk_state->voltage_level =
> - cnl_calc_voltage_level(cdclk_state->cdclk);
> -}
> -
> static void cnl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
> {
> u32 val;
> @@ -1830,91 +1854,6 @@ static int icl_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
> return dev_priv->cdclk.hw.ref * ratio;
> }
>
> -static u8 icl_calc_voltage_level(struct drm_i915_private *dev_priv, int cdclk)
> -{
> - if (IS_ELKHARTLAKE(dev_priv)) {
> - if (cdclk > 312000)
> - return 2;
> - else if (cdclk > 180000)
> - return 1;
> - else
> - return 0;
> - } else {
> - if (cdclk > 556800)
> - return 2;
> - else if (cdclk > 312000)
> - return 1;
> - else
> - return 0;
> - }
> -}
> -
> -static void icl_get_cdclk(struct drm_i915_private *dev_priv,
> - struct intel_cdclk_state *cdclk_state)
> -{
> - u32 val;
> - int div;
> -
> - val = I915_READ(SKL_DSSM);
> - switch (val & ICL_DSSM_CDCLK_PLL_REFCLK_MASK) {
> - default:
> - MISSING_CASE(val);
> - /* fall through */
> - case ICL_DSSM_CDCLK_PLL_REFCLK_24MHz:
> - cdclk_state->ref = 24000;
> - break;
> - case ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz:
> - cdclk_state->ref = 19200;
> - break;
> - case ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz:
> - cdclk_state->ref = 38400;
> - break;
> - }
> -
> - if (INTEL_GEN(dev_priv) >= 12)
> - cdclk_state->bypass = cdclk_state->ref / 2;
> - else
> - cdclk_state->bypass = 50000;
> -
> - val = I915_READ(BXT_DE_PLL_ENABLE);
> - if ((val & BXT_DE_PLL_PLL_ENABLE) == 0 ||
> - (val & BXT_DE_PLL_LOCK) == 0) {
> - /*
> - * CDCLK PLL is disabled, the VCO/ratio doesn't matter, but
> - * setting it to zero is a way to signal that.
> - */
> - cdclk_state->vco = 0;
> - cdclk_state->cdclk = cdclk_state->bypass;
> - goto out;
> - }
> -
> - cdclk_state->vco = (val & BXT_DE_PLL_RATIO_MASK) * cdclk_state->ref;
> -
> - val = I915_READ(CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;
> - switch (val) {
> - case BXT_CDCLK_CD2X_DIV_SEL_1:
> - div = 2;
> - break;
> - case BXT_CDCLK_CD2X_DIV_SEL_2:
> - div = 4;
> - break;
> - default:
> - MISSING_CASE(val);
> - div = 2;
> - break;
> - }
> -
> - cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco, div);
> -
> -out:
> - /*
> - * Can't read this out :( Let's assume it's
> - * at least what the CDCLK frequency requires.
> - */
> - cdclk_state->voltage_level =
> - icl_calc_voltage_level(dev_priv, cdclk_state->cdclk);
> -}
> -
> static void icl_init_cdclk(struct drm_i915_private *dev_priv)
> {
> struct intel_cdclk_state sanitized_state;
> @@ -1946,9 +1885,12 @@ static void icl_init_cdclk(struct drm_i915_private *dev_priv)
> sanitized_state.cdclk = icl_calc_cdclk(0, sanitized_state.ref);
> sanitized_state.vco = icl_calc_cdclk_pll_vco(dev_priv,
> sanitized_state.cdclk);
> - sanitized_state.voltage_level =
> - icl_calc_voltage_level(dev_priv,
> - sanitized_state.cdclk);
> + if (IS_ELKHARTLAKE(dev_priv))
> + sanitized_state.voltage_level =
> + ehl_calc_voltage_level(sanitized_state.cdclk);
> + else
> + sanitized_state.voltage_level =
> + icl_calc_voltage_level(sanitized_state.cdclk);
>
> cnl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE);
> }
> @@ -1959,8 +1901,12 @@ static void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
>
> cdclk_state.cdclk = cdclk_state.bypass;
> cdclk_state.vco = 0;
> - cdclk_state.voltage_level = icl_calc_voltage_level(dev_priv,
> - cdclk_state.cdclk);
> + if (IS_ELKHARTLAKE(dev_priv))
> + cdclk_state.voltage_level =
> + ehl_calc_voltage_level(cdclk_state.cdclk);
> + else
> + cdclk_state.voltage_level =
> + icl_calc_voltage_level(cdclk_state.cdclk);
>
> cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE);
> }
> @@ -2561,9 +2507,14 @@ static int icl_modeset_calc_cdclk(struct intel_atomic_state *state)
>
> state->cdclk.logical.vco = vco;
> state->cdclk.logical.cdclk = cdclk;
> - state->cdclk.logical.voltage_level =
> - max(icl_calc_voltage_level(dev_priv, cdclk),
> - cnl_compute_min_voltage_level(state));
> + if (IS_ELKHARTLAKE(dev_priv))
> + state->cdclk.logical.voltage_level =
> + max(ehl_calc_voltage_level(cdclk),
> + cnl_compute_min_voltage_level(state));
> + else
> + state->cdclk.logical.voltage_level =
> + max(icl_calc_voltage_level(cdclk),
> + cnl_compute_min_voltage_level(state));
>
> if (!state->active_pipes) {
> cdclk = icl_calc_cdclk(state->cdclk.force_min_cdclk, ref);
> @@ -2571,8 +2522,12 @@ static int icl_modeset_calc_cdclk(struct intel_atomic_state *state)
>
> state->cdclk.actual.vco = vco;
> state->cdclk.actual.cdclk = cdclk;
> - state->cdclk.actual.voltage_level =
> - icl_calc_voltage_level(dev_priv, cdclk);
> + if (IS_ELKHARTLAKE(dev_priv))
> + state->cdclk.actual.voltage_level =
> + ehl_calc_voltage_level(cdclk);
> + else
> + state->cdclk.actual.voltage_level =
> + icl_calc_voltage_level(cdclk);
> } else {
> state->cdclk.actual = state->cdclk.logical;
> }
> @@ -2819,11 +2774,7 @@ void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
> dev_priv->display.modeset_calc_cdclk = vlv_modeset_calc_cdclk;
> }
>
> - if (INTEL_GEN(dev_priv) >= 11)
> - dev_priv->display.get_cdclk = icl_get_cdclk;
> - else if (IS_CANNONLAKE(dev_priv))
> - dev_priv->display.get_cdclk = cnl_get_cdclk;
> - else if (IS_GEN9_LP(dev_priv))
> + if (INTEL_GEN(dev_priv) >= 10 || IS_GEN9_LP(dev_priv))
> dev_priv->display.get_cdclk = bxt_get_cdclk;
> else if (IS_GEN9_BC(dev_priv))
> dev_priv->display.get_cdclk = skl_get_cdclk;
> --
> 2.20.1
--
Ville Syrjälä
Intel
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