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drm/i915/cdclk: Reorder bxt_sanitize_cdclk()

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Make the sequence of steps in bxt_sanitize_cdclk() more logical by
grouping things related to the check on the value of CDCLK_CTL into a
single "block". Also, this will make an upcoming change replacing that
block with a single function call easier to follow.

v2:
  - Improve body of commit message to be more self-contained.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240105140538.183553-4-gustavo.sousa@intel.com
This commit is contained in:
Gustavo Sousa
2024-01-05 11:05:37 -03:00
committed by Matt Roper
parent 7af2f3e55c
commit ebb9c4240d
1 changed files with 14 additions and 14 deletions
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28
drivers/gpu/drm/i915/display/intel_cdclk.c
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@@ -2060,20 +2060,6 @@ static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
dev_priv->display.cdclk.hw.cdclk == dev_priv->display.cdclk.hw.bypass)
goto sanitize;
/* DPLL okay; verify the cdclock
*
* Some BIOS versions leave an incorrect decimal frequency value and
* set reserved MBZ bits in CDCLK_CTL at least during exiting from S4,
* so sanitize this register.
*/
cdctl = intel_de_read(dev_priv, CDCLK_CTL);
/*
* Let's ignore the pipe field, since BIOS could have configured the
* dividers both synching to an active pipe, or asynchronously
* (PIPE_NONE).
*/
cdctl &= ~bxt_cdclk_cd2x_pipe(dev_priv, INVALID_PIPE);
/* Make sure this is a legal cdclk value for the platform */
cdclk = bxt_calc_cdclk(dev_priv, dev_priv->display.cdclk.hw.cdclk);
if (cdclk != dev_priv->display.cdclk.hw.cdclk)
@@ -2084,6 +2070,20 @@ static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
if (vco != dev_priv->display.cdclk.hw.vco)
goto sanitize;
/*
* Some BIOS versions leave an incorrect decimal frequency value and
* set reserved MBZ bits in CDCLK_CTL at least during exiting from S4,
* so sanitize this register.
*/
cdctl = intel_de_read(dev_priv, CDCLK_CTL);
/*
* Let's ignore the pipe field, since BIOS could have configured the
* dividers both synching to an active pipe, or asynchronously
* (PIPE_NONE).
*/
cdctl &= ~bxt_cdclk_cd2x_pipe(dev_priv, INVALID_PIPE);
if (DISPLAY_VER(dev_priv) >= 20)
expected = MDCLK_SOURCE_SEL_CDCLK_PLL;
else