From 1b0e3a049efe471c399674fd954500ce97438d30 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Thu, 5 Nov 2015 23:04:11 +0200 Subject: [PATCH] drm/i915/skl: disable display side power well support for now MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The display power well support on this platform is in a somewhat broken state atm, so disable it by default. This in effect will get rid of incorrect assert WARNs about the CSR/DMC firmware not being loaded during power well toggling. It also removes a problem during driver loading where a register is accessed while its backing power well is down, resulting in another WARN. Until we come up with the root cause of the second problem and the proper fix for both issues, keep all display side power wells on. Also clarify a bit the option description. Reported-by: Dave Airlie Reference: http://mid.gmane.org/CAPM=9tyjBQjSBTKa49cRr6SYkpNW7Pq-fUFznZZ8Y1snvvk7mA@mail.gmail.com Signed-off-by: Imre Deak Reviewed-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1446757451-2777-1-git-send-email-imre.deak@intel.com Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_params.c | 5 +++-- drivers/gpu/drm/i915/intel_runtime_pm.c | 18 ++++++++++++++++++ 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index ca9b8f644ffe..96bb23865eac 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -38,7 +38,7 @@ struct i915_params i915 __read_mostly = { .enable_ppgtt = -1, .enable_psr = 0, .preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT), - .disable_power_well = 1, + .disable_power_well = -1, .enable_ips = 1, .prefault_disable = 0, .load_detect_test = 0, @@ -127,7 +127,8 @@ MODULE_PARM_DESC(preliminary_hw_support, module_param_named_unsafe(disable_power_well, i915.disable_power_well, int, 0600); MODULE_PARM_DESC(disable_power_well, - "Disable the power well when possible (default: true)"); + "Disable display power wells when possible " + "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); module_param_named_unsafe(enable_ips, i915.enable_ips, int, 0600); MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)"); diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 0cfe4c14866a..1aedf2762dff 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -1810,6 +1810,21 @@ static struct i915_power_well bxt_power_wells[] = { } }; +static int +sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv, + int disable_power_well) +{ + if (disable_power_well >= 0) + return !!disable_power_well; + + if (IS_SKYLAKE(dev_priv)) { + DRM_DEBUG_KMS("Disabling display power well support\n"); + return 0; + } + + return 1; +} + #define set_power_wells(power_domains, __power_wells) ({ \ (power_domains)->power_wells = (__power_wells); \ (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \ @@ -1826,6 +1841,9 @@ int intel_power_domains_init(struct drm_i915_private *dev_priv) { struct i915_power_domains *power_domains = &dev_priv->power_domains; + i915.disable_power_well = sanitize_disable_power_well_option(dev_priv, + i915.disable_power_well); + mutex_init(&power_domains->lock); /* -- 2.30.2