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authorMatt Roper <matthew.d.roper@intel.com>2015-01-23 03:53:12 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-01-27 11:57:34 +0300
commitb2e7723b09eb059584943febf47d637b2b8ca73f (patch)
tree9548828181c11135462236977362fcab7ff8e755 /drivers/gpu/drm/i915/i915_params.c
parentc196e1d66c36b0731cffc39fe28922b17c2901d9 (diff)
downloadlinux-b2e7723b09eb059584943febf47d637b2b8ca73f.tar.xz
drm/i915: Add i915.nuclear_pageflip command line param to force atomic (v4)
We don't have full atomic modeset support yet, but the "nuclear pageflip" subset of functionality (i.e., plane operations only) should be ready. Allow the user to force atomic on for debug purposes, or for fixed-purpose embedded devices that will only use atomic for plane updates. The term 'nuclear' is used here instead of 'atomic' to make it clear that this doesn't allow full atomic modeset support, just a (very useful) subset of the atomic functionality. We'll drop the kernel parameter and unconditionally enable atomic in a future patch once all of the necessary pieces are in. v2: - Use module_param_named_unsafe() (Daniel) - Simplify comment on DRIVER_ATOMIC guard (Daniel) v3: - Make the parameter "nuclear_pageflip" rather than just "nuclear" for clarity. (Ander) v4: - Make the internal variable "nuclear_pageflip" as well as the command-line option. (Ander) Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_params.c')
-rw-r--r--drivers/gpu/drm/i915/i915_params.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 07252d8dc726..44f2262a5553 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -52,6 +52,7 @@ struct i915_params i915 __read_mostly = {
.use_mmio_flip = 0,
.mmio_debug = 0,
.verbose_state_checks = 1,
+ .nuclear_pageflip = 0,
};
module_param_named(modeset, i915.modeset, int, 0400);
@@ -178,3 +179,7 @@ MODULE_PARM_DESC(mmio_debug,
module_param_named(verbose_state_checks, i915.verbose_state_checks, bool, 0600);
MODULE_PARM_DESC(verbose_state_checks,
"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
+
+module_param_named_unsafe(nuclear_pageflip, i915.nuclear_pageflip, bool, 0600);
+MODULE_PARM_DESC(nuclear_pageflip,
+ "Force atomic modeset functionality; only planes work for now (default: false).");