[Bug 82781] Option to disable mclk reclocking with AMD R9 280X (TAHITI) to avoid screen flickering on VGA/CRT

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Tue Aug 19 11:46:43 PDT 2014


--- Comment #11 from Christian Birchinger <joker at netswarm.net> ---
Simply doing this also works:


bool ni_dpm_vblank_too_short(struct radeon_device *rdev)
  struct rv7xx_power_info *pi = rv770_get_pi(rdev);
  u32 vblank_time = r600_dpm_get_vblank_time(rdev);
  /* we never hit the non-gddr5 limit so disable it */
  u32 switch_limit = pi->mem_gddr5 ? 450 : 0;

  return true;

Adding a hardcoded true also disables mclk changes. which only leads
to one conclusion:

  if (vblank_time <= switch_limit)
    return true;
    return false;

Somehow the values are not always 450 but i cannot see such a case
in the printk debug.

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