diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_cdclk.c')
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_cdclk.c | 218 |
1 files changed, 184 insertions, 34 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c index b74e36d76013..7e16b655c833 100644 --- a/drivers/gpu/drm/i915/display/intel_cdclk.c +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c @@ -1319,7 +1319,7 @@ static const struct intel_cdclk_vals adlp_cdclk_table[] = { { .refclk = 24000, .cdclk = 192000, .divider = 2, .ratio = 16 }, { .refclk = 24000, .cdclk = 312000, .divider = 2, .ratio = 26 }, { .refclk = 24000, .cdclk = 552000, .divider = 2, .ratio = 46 }, - { .refclk = 24400, .cdclk = 648000, .divider = 2, .ratio = 54 }, + { .refclk = 24000, .cdclk = 648000, .divider = 2, .ratio = 54 }, { .refclk = 38400, .cdclk = 179200, .divider = 3, .ratio = 14 }, { .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 10 }, @@ -1346,6 +1346,16 @@ static const struct intel_cdclk_vals dg2_cdclk_table[] = { {} }; +static const struct intel_cdclk_vals mtl_cdclk_table[] = { + { .refclk = 38400, .cdclk = 172800, .divider = 2, .ratio = 16, .waveform = 0xad5a }, + { .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 16, .waveform = 0xb6b6 }, + { .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16, .waveform = 0x0000 }, + { .refclk = 38400, .cdclk = 480000, .divider = 2, .ratio = 25, .waveform = 0x0000 }, + { .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29, .waveform = 0x0000 }, + { .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34, .waveform = 0x0000 }, + {} +}; + static int bxt_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk) { const struct intel_cdclk_vals *table = dev_priv->display.cdclk.table; @@ -1717,39 +1727,92 @@ static void dg2_cdclk_squash_program(struct drm_i915_private *i915, intel_de_write(i915, CDCLK_SQUASH_CTL, squash_ctl); } -static void bxt_set_cdclk(struct drm_i915_private *dev_priv, - const struct intel_cdclk_config *cdclk_config, - enum pipe pipe) +static bool cdclk_pll_is_unknown(unsigned int vco) +{ + /* + * Ensure driver does not take the crawl path for the + * case when the vco is set to ~0 in the + * sanitize path. + */ + return vco == ~0; +} + +static int cdclk_squash_divider(u16 waveform) +{ + return hweight16(waveform ?: 0xffff); +} + +static bool cdclk_compute_crawl_and_squash_midpoint(struct drm_i915_private *i915, + const struct intel_cdclk_config *old_cdclk_config, + const struct intel_cdclk_config *new_cdclk_config, + struct intel_cdclk_config *mid_cdclk_config) +{ + u16 old_waveform, new_waveform, mid_waveform; + int size = 16; + int div = 2; + + /* Return if PLL is in an unknown state, force a complete disable and re-enable. */ + if (cdclk_pll_is_unknown(old_cdclk_config->vco)) + return false; + + /* Return if both Squash and Crawl are not present */ + if (!HAS_CDCLK_CRAWL(i915) || !HAS_CDCLK_SQUASH(i915)) + return false; + + old_waveform = cdclk_squash_waveform(i915, old_cdclk_config->cdclk); + new_waveform = cdclk_squash_waveform(i915, new_cdclk_config->cdclk); + + /* Return if Squash only or Crawl only is the desired action */ + if (old_cdclk_config->vco == 0 || new_cdclk_config->vco == 0 || + old_cdclk_config->vco == new_cdclk_config->vco || + old_waveform == new_waveform) + return false; + + *mid_cdclk_config = *new_cdclk_config; + + /* + * Populate the mid_cdclk_config accordingly. + * - If moving to a higher cdclk, the desired action is squashing. + * The mid cdclk config should have the new (squash) waveform. + * - If moving to a lower cdclk, the desired action is crawling. + * The mid cdclk config should have the new vco. + */ + + if (cdclk_squash_divider(new_waveform) > cdclk_squash_divider(old_waveform)) { + mid_cdclk_config->vco = old_cdclk_config->vco; + mid_waveform = new_waveform; + } else { + mid_cdclk_config->vco = new_cdclk_config->vco; + mid_waveform = old_waveform; + } + + mid_cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_squash_divider(mid_waveform) * + mid_cdclk_config->vco, size * div); + + /* make sure the mid clock came out sane */ + + drm_WARN_ON(&i915->drm, mid_cdclk_config->cdclk < + min(old_cdclk_config->cdclk, new_cdclk_config->cdclk)); + drm_WARN_ON(&i915->drm, mid_cdclk_config->cdclk > + i915->display.cdclk.max_cdclk_freq); + drm_WARN_ON(&i915->drm, cdclk_squash_waveform(i915, mid_cdclk_config->cdclk) != + mid_waveform); + + return true; +} + +static void _bxt_set_cdclk(struct drm_i915_private *dev_priv, + const struct intel_cdclk_config *cdclk_config, + enum pipe pipe) { int cdclk = cdclk_config->cdclk; int vco = cdclk_config->vco; u32 val; u16 waveform; int clock; - int ret; - - /* Inform power controller of upcoming frequency change. */ - if (DISPLAY_VER(dev_priv) >= 11) - ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, - SKL_CDCLK_PREPARE_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, - SKL_CDCLK_READY_FOR_CHANGE, 3); - else - /* - * BSpec requires us to wait up to 150usec, but that leads to - * timeouts; the 2ms used here is based on experiment. - */ - ret = snb_pcode_write_timeout(&dev_priv->uncore, - HSW_PCODE_DE_WRITE_FREQ_REQ, - 0x80000000, 150, 2); - if (ret) { - drm_err(&dev_priv->drm, - "Failed to inform PCU about cdclk change (err %d, freq %d)\n", - ret, cdclk); - return; - } - if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->display.cdclk.hw.vco > 0 && vco > 0) { + if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->display.cdclk.hw.vco > 0 && vco > 0 && + !cdclk_pll_is_unknown(dev_priv->display.cdclk.hw.vco)) { if (dev_priv->display.cdclk.hw.vco != vco) adlp_cdclk_pll_crawl(dev_priv, vco); } else if (DISPLAY_VER(dev_priv) >= 11) @@ -1782,11 +1845,62 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv, if (pipe != INVALID_PIPE) intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(dev_priv, pipe)); +} + +static void bxt_set_cdclk(struct drm_i915_private *dev_priv, + const struct intel_cdclk_config *cdclk_config, + enum pipe pipe) +{ + struct intel_cdclk_config mid_cdclk_config; + int cdclk = cdclk_config->cdclk; + int ret = 0; + + /* + * Inform power controller of upcoming frequency change. + * Display versions 14 and beyond do not follow the PUnit + * mailbox communication, skip + * this step. + */ + if (DISPLAY_VER(dev_priv) >= 14) + /* NOOP */; + else if (DISPLAY_VER(dev_priv) >= 11) + ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, + SKL_CDCLK_PREPARE_FOR_CHANGE, + SKL_CDCLK_READY_FOR_CHANGE, + SKL_CDCLK_READY_FOR_CHANGE, 3); + else + /* + * BSpec requires us to wait up to 150usec, but that leads to + * timeouts; the 2ms used here is based on experiment. + */ + ret = snb_pcode_write_timeout(&dev_priv->uncore, + HSW_PCODE_DE_WRITE_FREQ_REQ, + 0x80000000, 150, 2); + + if (ret) { + drm_err(&dev_priv->drm, + "Failed to inform PCU about cdclk change (err %d, freq %d)\n", + ret, cdclk); + return; + } + + if (cdclk_compute_crawl_and_squash_midpoint(dev_priv, &dev_priv->display.cdclk.hw, + cdclk_config, &mid_cdclk_config)) { + _bxt_set_cdclk(dev_priv, &mid_cdclk_config, pipe); + _bxt_set_cdclk(dev_priv, cdclk_config, pipe); + } else { + _bxt_set_cdclk(dev_priv, cdclk_config, pipe); + } - if (DISPLAY_VER(dev_priv) >= 11) { + if (DISPLAY_VER(dev_priv) >= 14) + /* + * NOOP - No Pcode communication needed for + * Display versions 14 and beyond + */; + else if (DISPLAY_VER(dev_priv) >= 11) ret = snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL, cdclk_config->voltage_level); - } else { + else /* * The timeout isn't specified, the 2ms used here is based on * experiment. @@ -1797,7 +1911,6 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ, cdclk_config->voltage_level, 150, 2); - } if (ret) { drm_err(&dev_priv->drm, @@ -1954,6 +2067,28 @@ void intel_cdclk_uninit_hw(struct drm_i915_private *i915) skl_cdclk_uninit_hw(i915); } +static bool intel_cdclk_can_crawl_and_squash(struct drm_i915_private *i915, + const struct intel_cdclk_config *a, + const struct intel_cdclk_config *b) +{ + u16 old_waveform; + u16 new_waveform; + + drm_WARN_ON(&i915->drm, cdclk_pll_is_unknown(a->vco)); + + if (a->vco == 0 || b->vco == 0) + return false; + + if (!HAS_CDCLK_CRAWL(i915) || !HAS_CDCLK_SQUASH(i915)) + return false; + + old_waveform = cdclk_squash_waveform(i915, a->cdclk); + new_waveform = cdclk_squash_waveform(i915, b->cdclk); + + return a->vco != b->vco && + old_waveform != new_waveform; +} + static bool intel_cdclk_can_crawl(struct drm_i915_private *dev_priv, const struct intel_cdclk_config *a, const struct intel_cdclk_config *b) @@ -2760,9 +2895,14 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state *state) pipe = INVALID_PIPE; } - if (intel_cdclk_can_squash(dev_priv, - &old_cdclk_state->actual, - &new_cdclk_state->actual)) { + if (intel_cdclk_can_crawl_and_squash(dev_priv, + &old_cdclk_state->actual, + &new_cdclk_state->actual)) { + drm_dbg_kms(&dev_priv->drm, + "Can change cdclk via crawling and squashing\n"); + } else if (intel_cdclk_can_squash(dev_priv, + &old_cdclk_state->actual, + &new_cdclk_state->actual)) { drm_dbg_kms(&dev_priv->drm, "Can change cdclk via squashing\n"); } else if (intel_cdclk_can_crawl(dev_priv, @@ -3060,6 +3200,13 @@ u32 intel_read_rawclk(struct drm_i915_private *dev_priv) return freq; } +static const struct intel_cdclk_funcs mtl_cdclk_funcs = { + .get_cdclk = bxt_get_cdclk, + .set_cdclk = bxt_set_cdclk, + .modeset_calc_cdclk = bxt_modeset_calc_cdclk, + .calc_voltage_level = tgl_calc_voltage_level, +}; + static const struct intel_cdclk_funcs tgl_cdclk_funcs = { .get_cdclk = bxt_get_cdclk, .set_cdclk = bxt_set_cdclk, @@ -3195,7 +3342,10 @@ static const struct intel_cdclk_funcs i830_cdclk_funcs = { */ void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv) { - if (IS_DG2(dev_priv)) { + if (IS_METEORLAKE(dev_priv)) { + dev_priv->display.funcs.cdclk = &mtl_cdclk_funcs; + dev_priv->display.cdclk.table = mtl_cdclk_table; + } else if (IS_DG2(dev_priv)) { dev_priv->display.funcs.cdclk = &tgl_cdclk_funcs; dev_priv->display.cdclk.table = dg2_cdclk_table; } else if (IS_ALDERLAKE_P(dev_priv)) { |