From: Jani Nikula jani.nikula@intel.com
commit 2f216a8507153578efc309c821528a6b81628cd2 upstream.
Since CNP it's possible for rawclk to have two different values, 19.2 and 24 MHz. If the value indicated by SFUSE_STRAP register is different from the power on default for PCH_RAWCLK_FREQ, we'll end up having a mismatch between the rawclk hardware and software states after suspend/resume. On previous platforms this used to work by accident, because the power on defaults worked just fine.
Update the rawclk also on resume. The natural place to do this would be intel_modeset_init_hw(), however VLV/CHV need it done before intel_power_domains_init_hw(). Thus put it there even if it feels slightly out of place.
v2: Call intel_update_rawclck() in intel_power_domains_init_hw() for all platforms (Ville).
Reported-by: Shawn Lee shawn.c.lee@intel.com Cc: Shawn Lee shawn.c.lee@intel.com Cc: Ville Syrjala ville.syrjala@linux.intel.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Tested-by: Shawn Lee shawn.c.lee@intel.com Signed-off-by: Jani Nikula jani.nikula@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20191101142024.13877-1-jani.ni... (cherry picked from commit 59ed05ccdded5eb18ce012eff3d01798ac8535fa) Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/i915/display/intel_display_power.c | 3 +++ drivers/gpu/drm/i915/i915_drv.c | 3 --- 2 files changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -4345,6 +4345,9 @@ void intel_power_domains_init_hw(struct
power_domains->initializing = true;
+ /* Must happen before power domain init on VLV/CHV */ + intel_update_rawclk(i915); + if (INTEL_GEN(i915) >= 11) { icl_display_core_init(i915, resume); } else if (IS_CANNONLAKE(i915)) { --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -708,9 +708,6 @@ static int i915_load_modeset_init(struct if (ret) goto cleanup_vga_client;
- /* must happen before intel_power_domains_init_hw() on VLV/CHV */ - intel_update_rawclk(dev_priv); - intel_power_domains_init_hw(dev_priv, false);
intel_csr_ucode_init(dev_priv);