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drm/i915/lnl: Start using CDCLK through PLL

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Introduce correspondent definitions for choosing between CD2X CDCLK
and PLL CDCLK as a source. All the entries in cdclk table for xe2lpd are
defined with PLL CDCLK as source, so simply set it. Also
skl_cdclk_decimal() shouldn't be set in CDCLK_CTL anymore, so skip it
for display version 20 and above.

v2:
  - Remove unneeded comment and use REG_BIT() (Matt Roper)
  - Rename CDCLK_SOURCE_SEL_CDCLK_PLL() to MDCLK_SOURCE_SEL_CDCLK_PLL
    to match spec (Lucas)

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919192128.2045154-22-lucas.demarchi@intel.com
This commit is contained in:
Stanislav Lisovskiy 2023-09-19 12:21:28 -07:00 • committed by Lucas De Marchi
parent 43e18b0a54
commit 3d3696c0fe
2 changed files with 8 additions and 2 deletions
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9
drivers/gpu/drm/i915/display/intel_cdclk.c
View file

@ -1906,8 +1906,7 @@ static void _bxt_set_cdclk(struct drm_i915_private *dev_priv,
dg2_cdclk_squash_program(dev_priv, waveform);
val = bxt_cdclk_cd2x_div_sel(dev_priv, clock, vco) |
bxt_cdclk_cd2x_pipe(dev_priv, pipe) |
skl_cdclk_decimal(cdclk);
bxt_cdclk_cd2x_pipe(dev_priv, pipe);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
@ -1916,6 +1915,12 @@ static void _bxt_set_cdclk(struct drm_i915_private *dev_priv,
if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
if (DISPLAY_VER(dev_priv) >= 20)
val |= MDCLK_SOURCE_SEL_CDCLK_PLL;
else
val |= skl_cdclk_decimal(cdclk);
intel_de_write(dev_priv, CDCLK_CTL, val);
if (pipe != INVALID_PIPE)

1
drivers/gpu/drm/i915/i915_reg.h
View file

@ -5882,6 +5882,7 @@ enum skl_power_gate {
#define CDCLK_FREQ_540 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 1)
#define CDCLK_FREQ_337_308 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 2)
#define CDCLK_FREQ_675_617 REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 3)
#define MDCLK_SOURCE_SEL_CDCLK_PLL REG_BIT(25)
#define BXT_CDCLK_CD2X_DIV_SEL_MASK REG_GENMASK(23, 22)
#define BXT_CDCLK_CD2X_DIV_SEL_1 REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 0)
#define BXT_CDCLK_CD2X_DIV_SEL_1_5 REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 1)