From 385ba629aa1cdca5373c1fdbf6693ade5062ad27 Mon Sep 17 00:00:00 2001 From: Matt Roper Date: Thu, 29 Aug 2019 17:48:28 -0700 Subject: [PATCH] drm/i915: Allow /2 CD2X divider on gen11+ MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The bspec has just recently been updated with new cdclk values that require the use of a /2 CD2X divider rather than a /1 divider. Once we add the divider selection logic to ICL+ cdclk programming, we have pretty much the same logic we were already using on CNL, so it's simpler to drop icl_set_cdclk() completely and reuse cnl_set_cdclk() on gen11+ platforms as well. v2: - Using ICL_CDCLK_CD2X_PIPE_NONE + BXT_CDCLK_CD2X_PIPE(pipe) for TGL is correct, but looks really confusing. Add some TGL_ macros that alias these to avoid confusion. (Ville) - Use DIV_ROUND_CLOSEST rather than / when applying the divider. (Ville) Cc: José Roberto de Souza Cc: Lucas De Marchi Cc: Ville Syrjälä Signed-off-by: Matt Roper Reviewed-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190830004828.19359-1-matthew.d.roper@intel.com --- drivers/gpu/drm/i915/display/intel_cdclk.c | 90 +++++++++------------- drivers/gpu/drm/i915/i915_reg.h | 3 + 2 files changed, 38 insertions(+), 55 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c index 939088c7d814..58ba42dcf23f 100644 --- a/drivers/gpu/drm/i915/display/intel_cdclk.c +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c @@ -1659,10 +1659,23 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv, cnl_cdclk_pll_enable(dev_priv, vco); val = divider | skl_cdclk_decimal(cdclk); - if (pipe == INVALID_PIPE) - val |= BXT_CDCLK_CD2X_PIPE_NONE; - else - val |= BXT_CDCLK_CD2X_PIPE(pipe); + + if (INTEL_GEN(dev_priv) >= 12) { + if (pipe == INVALID_PIPE) + val |= TGL_CDCLK_CD2X_PIPE_NONE; + else + val |= TGL_CDCLK_CD2X_PIPE(pipe); + } else if (INTEL_GEN(dev_priv) >= 11) { + if (pipe == INVALID_PIPE) + val |= ICL_CDCLK_CD2X_PIPE_NONE; + else + val |= ICL_CDCLK_CD2X_PIPE(pipe); + } else { + if (pipe == INVALID_PIPE) + val |= BXT_CDCLK_CD2X_PIPE_NONE; + else + val |= BXT_CDCLK_CD2X_PIPE(pipe); + } I915_WRITE(CDCLK_CTL, val); if (pipe != INVALID_PIPE) @@ -1813,51 +1826,6 @@ static int icl_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk) return dev_priv->cdclk.hw.ref * ratio; } -static void icl_set_cdclk(struct drm_i915_private *dev_priv, - const struct intel_cdclk_state *cdclk_state, - enum pipe pipe) -{ - unsigned int cdclk = cdclk_state->cdclk; - unsigned int vco = cdclk_state->vco; - int ret; - - ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL, - SKL_CDCLK_PREPARE_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, 3); - if (ret) { - DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n", - ret); - return; - } - - if (dev_priv->cdclk.hw.vco != 0 && - dev_priv->cdclk.hw.vco != vco) - cnl_cdclk_pll_disable(dev_priv); - - if (dev_priv->cdclk.hw.vco != vco) - cnl_cdclk_pll_enable(dev_priv, vco); - - /* - * On ICL CD2X_DIV can only be 1, so we'll never end up changing the - * divider here synchronized to a pipe while CDCLK is on, nor will we - * need the corresponding vblank wait. - */ - I915_WRITE(CDCLK_CTL, ICL_CDCLK_CD2X_PIPE_NONE | - skl_cdclk_decimal(cdclk)); - - sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL, - cdclk_state->voltage_level); - - intel_update_cdclk(dev_priv); - - /* - * Can't read out the voltage level :( - * Let's just assume everything is as expected. - */ - dev_priv->cdclk.hw.voltage_level = cdclk_state->voltage_level; -} - static u8 icl_calc_voltage_level(struct drm_i915_private *dev_priv, int cdclk) { if (IS_ELKHARTLAKE(dev_priv)) { @@ -1881,6 +1849,7 @@ static void icl_get_cdclk(struct drm_i915_private *dev_priv, struct intel_cdclk_state *cdclk_state) { u32 val; + int div; cdclk_state->bypass = 50000; @@ -1914,10 +1883,21 @@ static void icl_get_cdclk(struct drm_i915_private *dev_priv, cdclk_state->vco = (val & BXT_DE_PLL_RATIO_MASK) * cdclk_state->ref; - val = I915_READ(CDCLK_CTL); - WARN_ON((val & BXT_CDCLK_CD2X_DIV_SEL_MASK) != 0); + 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 = cdclk_state->vco / 2; + cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco, div); out: /* @@ -1963,7 +1943,7 @@ sanitize: icl_calc_voltage_level(dev_priv, sanitized_state.cdclk); - icl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE); + cnl_set_cdclk(dev_priv, &sanitized_state, INVALID_PIPE); } static void icl_uninit_cdclk(struct drm_i915_private *dev_priv) @@ -1975,7 +1955,7 @@ static void icl_uninit_cdclk(struct drm_i915_private *dev_priv) cdclk_state.voltage_level = icl_calc_voltage_level(dev_priv, cdclk_state.cdclk); - icl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE); + cnl_set_cdclk(dev_priv, &cdclk_state, INVALID_PIPE); } static void cnl_init_cdclk(struct drm_i915_private *dev_priv) @@ -2810,7 +2790,7 @@ void intel_update_rawclk(struct drm_i915_private *dev_priv) void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv) { if (INTEL_GEN(dev_priv) >= 11) { - dev_priv->display.set_cdclk = icl_set_cdclk; + dev_priv->display.set_cdclk = cnl_set_cdclk; dev_priv->display.modeset_calc_cdclk = icl_modeset_calc_cdclk; } else if (IS_CANNONLAKE(dev_priv)) { dev_priv->display.set_cdclk = cnl_set_cdclk; diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 53735433fe20..6c43b8c583bb 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -9759,7 +9759,10 @@ enum skl_power_gate { #define BXT_CDCLK_CD2X_PIPE(pipe) ((pipe) << 20) #define CDCLK_DIVMUX_CD_OVERRIDE (1 << 19) #define BXT_CDCLK_CD2X_PIPE_NONE BXT_CDCLK_CD2X_PIPE(3) +#define ICL_CDCLK_CD2X_PIPE(pipe) (_PICK(pipe, 0, 2, 6) << 19) #define ICL_CDCLK_CD2X_PIPE_NONE (7 << 19) +#define TGL_CDCLK_CD2X_PIPE(pipe) BXT_CDCLK_CD2X_PIPE(pipe) +#define TGL_CDCLK_CD2X_PIPE_NONE ICL_CDCLK_CD2X_PIPE_NONE #define BXT_CDCLK_SSA_PRECHARGE_ENABLE (1 << 16) #define CDCLK_FREQ_DECIMAL_MASK (0x7ff)