From: Daniel Vetter <[email protected]> 3.4.107-rc1 review patch. If anyone has any objections, please let me know.
------------------ commit b0616c5306b342ceca07044dbc4f917d95c4f825 upstream. Otherwise we'll have backtraces in assert_panel_unlocked because the BIOS locks the register. In the reporter's case this regression was introduced in commit c31407a3672aaebb4acddf90944a114fa5c8af7b Author: Chris Wilson <[email protected]> Date: Thu Oct 18 21:07:01 2012 +0100 drm/i915: Add no-lvds quirk for Supermicro X7SPA-H Reported-by: Alexey Orishko <[email protected]> Cc: Alexey Orishko <[email protected]> Cc: Chris Wilson <[email protected]> Cc: Francois Tigeot <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> Tested-by: Alexey Orishko <[email protected]> Signed-off-by: Jani Nikula <[email protected]> [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li <[email protected]> --- drivers/gpu/drm/i915/intel_lvds.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 77190cc..3febe29 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -932,6 +932,17 @@ bool intel_lvds_init(struct drm_device *dev) int pipe; u8 pin; + /* + * Unlock registers and just leave them unlocked. Do this before + * checking quirk lists to avoid bogus WARNINGs. + */ + if (HAS_PCH_SPLIT(dev)) { + I915_WRITE(PCH_PP_CONTROL, + I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS); + } else { + I915_WRITE(PP_CONTROL, + I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS); + } if (!intel_lvds_supported(dev)) return false; @@ -1109,19 +1120,6 @@ out: pwm = I915_READ(BLC_PWM_PCH_CTL1); pwm |= PWM_PCH_ENABLE; I915_WRITE(BLC_PWM_PCH_CTL1, pwm); - /* - * Unlock registers and just - * leave them unlocked - */ - I915_WRITE(PCH_PP_CONTROL, - I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS); - } else { - /* - * Unlock registers and just - * leave them unlocked - */ - I915_WRITE(PP_CONTROL, - I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS); } dev_priv->lid_notifier.notifier_call = intel_lid_notify; if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
