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drm/i915: Add fallback for CDCLK selection when min_cdclk is too high

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In cases where the requested minimum CDCLK exceeds all available
values for the current reference clock, the CDCLK selection logic
previously returned 0. This could result coverity division or
modulo by zero issue.
Introduce a fallback mechanism that returns platform's max_cdclk_freq
instead of 0.

v2: Update safe fallback value to max cdclk. (Ville)
v3: Update commit messgae (Mika)

Signed-off-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20251017150526.781715-1-ramanaidu.naladala@intel.com
This commit is contained in:
Naladala Ramanaidu
2025-10-17 20:35:26 +05:30
committed by Suraj Kandpal
parent 938c6c9be3
commit bbbfa70dfe
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_cdclk.c
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@@ -1561,7 +1561,7 @@ static int bxt_calc_cdclk(struct intel_display *display, int min_cdclk)
drm_WARN(display->drm, 1,
"Cannot satisfy minimum cdclk %d with refclk %u\n",
min_cdclk, display->cdclk.hw.ref);
return 0;
return display->cdclk.max_cdclk_freq;
}
static int bxt_calc_cdclk_pll_vco(struct intel_display *display, int cdclk)