* Re: [PATCH v3 05/10] drm: Add helpers to kick off self refresh mode in drivers
2019-05-02 19:49 ` [PATCH v3 05/10] drm: Add helpers to kick off self refresh mode in drivers Sean Paul
@ 2019-05-03 7:36 ` Daniel Vetter
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Vetter @ 2019-05-03 7:36 UTC (permalink / raw)
To: Sean Paul
Cc: dri-devel, Sean Paul, Daniel Vetter, Jose Souza, Zain Wang,
Tomasz Figa, Ville Syrjälä, Maarten Lankhorst,
Maxime Ripard, David Airlie, Jonathan Corbet, linux-doc,
linux-kernel
On Thu, May 02, 2019 at 03:49:47PM -0400, Sean Paul wrote:
> From: Sean Paul <seanpaul@chromium.org>
>
> This patch adds a new drm helper library to help drivers implement
> self refresh. Drivers choosing to use it will register crtcs and
> will receive callbacks when it's time to enter or exit self refresh
> mode.
>
> In its current form, it has a timer which will trigger after a
> driver-specified amount of inactivity. When the timer triggers, the
> helpers will submit a new atomic commit to shut the refreshing pipe
> off. On the next atomic commit, the drm core will revert the self
> refresh state and bring everything back up to be actively driven.
>
> From the driver's perspective, this works like a regular disable/enable
> cycle. The driver need only check the 'self_refresh_active' state in
> crtc_state. It should initiate self refresh mode on the panel and enter
> an off or low-power state.
>
> Changes in v2:
> - s/psr/self_refresh/ (Daniel)
> - integrated the psr exit into the commit that wakes it up (Jose/Daniel)
> - made the psr state per-crtc (Jose/Daniel)
> Changes in v3:
> - Remove the self_refresh_(active|changed) from connector state (Daniel)
> - Simplify loop in drm_self_refresh_helper_alter_state (Daniel)
> - Improve self_refresh_aware comment (Daniel)
> - s/self_refresh_state/self_refresh_data/ (Daniel)
>
> Link to v1: https://patchwork.freedesktop.org/patch/msgid/20190228210939.83386-2-sean@poorly.run
> Link to v2: https://patchwork.freedesktop.org/patch/msgid/20190326204509.96515-1-sean@poorly.run
>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Jose Souza <jose.souza@intel.com>
> Cc: Zain Wang <wzz@rock-chips.com>
> Cc: Tomasz Figa <tfiga@chromium.org>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
lgtm now, thanks a lot for sticking with this! Surprising lots of corner
cases I had to learn about and figure out what to best do with them.
> ---
> Documentation/gpu/drm-kms-helpers.rst | 9 +
> drivers/gpu/drm/Makefile | 2 +-
> drivers/gpu/drm/drm_atomic.c | 2 +
> drivers/gpu/drm/drm_atomic_helper.c | 35 +++-
> drivers/gpu/drm/drm_atomic_state_helper.c | 4 +
> drivers/gpu/drm/drm_atomic_uapi.c | 7 +-
> drivers/gpu/drm/drm_self_refresh_helper.c | 205 ++++++++++++++++++++++
> include/drm/drm_atomic.h | 15 ++
> include/drm/drm_connector.h | 14 ++
> include/drm/drm_crtc.h | 19 ++
> include/drm/drm_self_refresh_helper.h | 22 +++
> 11 files changed, 329 insertions(+), 5 deletions(-)
> create mode 100644 drivers/gpu/drm/drm_self_refresh_helper.c
> create mode 100644 include/drm/drm_self_refresh_helper.h
>
> diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
> index 14102ae035dc..d8a13c6b4db3 100644
> --- a/Documentation/gpu/drm-kms-helpers.rst
> +++ b/Documentation/gpu/drm-kms-helpers.rst
> @@ -113,6 +113,15 @@ format Helper Functions Reference
> .. kernel-doc:: drivers/gpu/drm/drm_format_helper.c
> :export:
>
> +Panel Self Refresh Helper Reference
> +===================================
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c
> + :doc: overview
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c
> + :export:
I think this isn't the best place to insert the self refresh helpers. I'd
put them right below panel helpers, together with the other sink related
stuff. I think fits much better there than between the format and gem
helpers ...
> +
> Framebuffer CMA Helper Functions Reference
> ==========================================
>
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 3d0c75cd687c..c4852604fc1d 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -39,7 +39,7 @@ drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper
> drm_simple_kms_helper.o drm_modeset_helper.o \
> drm_scdc_helper.o drm_gem_framebuffer_helper.o \
> drm_atomic_state_helper.o drm_damage_helper.o \
> - drm_format_helper.o
> + drm_format_helper.o drm_self_refresh_helper.o
>
> drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o
> drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 5eb40130fafb..4449956241f2 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -379,6 +379,7 @@ static void drm_atomic_crtc_print_state(struct drm_printer *p,
> drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
> drm_printf(p, "\tenable=%d\n", state->enable);
> drm_printf(p, "\tactive=%d\n", state->active);
> + drm_printf(p, "\tself_refresh_active=%d\n", state->self_refresh_active);
> drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
> drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
> drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
> @@ -881,6 +882,7 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
>
> drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
> drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
> + drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
>
> if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
> if (state->writeback_job && state->writeback_job->fb)
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index fa5a367507c1..3c26f04cd6b8 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -30,6 +30,7 @@
> #include <drm/drm_atomic_uapi.h>
> #include <drm/drm_plane_helper.h>
> #include <drm/drm_atomic_helper.h>
> +#include <drm/drm_self_refresh_helper.h>
> #include <drm/drm_writeback.h>
> #include <drm/drm_damage_helper.h>
> #include <linux/dma-fence.h>
> @@ -950,10 +951,33 @@ int drm_atomic_helper_check(struct drm_device *dev,
> if (state->legacy_cursor_update)
> state->async_update = !drm_atomic_helper_async_check(dev, state);
>
> + drm_self_refresh_helper_alter_state(state);
> +
> return ret;
> }
> EXPORT_SYMBOL(drm_atomic_helper_check);
>
> +static bool
> +crtc_needs_disable(struct drm_crtc_state *old_state,
> + struct drm_crtc_state *new_state)
> +{
> + /*
> + * No new_state means the crtc is off, so the only criteria is whether
> + * it's currently active or in self refresh mode.
> + */
> + if (!new_state)
> + return drm_atomic_crtc_effectively_active(old_state);
> +
> + /*
> + * We need to run through the crtc_funcs->disable() function if the crtc
> + * is currently on, if it's transitioning to self refresh mode, or if
> + * it's in self refresh mode and needs to be fully disabled.
> + */
> + return old_state->active ||
> + (old_state->self_refresh_active && !new_state->enable) ||
> + new_state->self_refresh_active;
> +}
> +
> static void
> disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
> {
> @@ -974,7 +998,14 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
>
> old_crtc_state = drm_atomic_get_old_crtc_state(old_state, old_conn_state->crtc);
>
> - if (!old_crtc_state->active ||
> + if (new_conn_state->crtc)
> + new_crtc_state = drm_atomic_get_new_crtc_state(
> + old_state,
> + new_conn_state->crtc);
> + else
> + new_crtc_state = NULL;
> +
> + if (!crtc_needs_disable(old_crtc_state, new_crtc_state) ||
> !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
> continue;
>
> @@ -1020,7 +1051,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
> if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
> continue;
>
> - if (!old_crtc_state->active)
> + if (!crtc_needs_disable(old_crtc_state, new_crtc_state))
> continue;
>
> funcs = crtc->helper_private;
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index ac929f68ff31..ca18008043e5 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -128,6 +128,10 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
> state->commit = NULL;
> state->event = NULL;
> state->pageflip_flags = 0;
> +
> + /* Self refresh should be canceled when a new update is available */
> + state->active = drm_atomic_crtc_effectively_active(state);
> + state->self_refresh_active = false;
> }
> EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
>
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index ea797d4c82ee..a75c633ff0c0 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -490,7 +490,7 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
> struct drm_mode_config *config = &dev->mode_config;
>
> if (property == config->prop_active)
> - *val = state->active;
> + *val = drm_atomic_crtc_effectively_active(state);
> else if (property == config->prop_mode_id)
> *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
> else if (property == config->prop_vrr_enabled)
> @@ -772,7 +772,10 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
> if (property == config->prop_crtc_id) {
> *val = (state->crtc) ? state->crtc->base.id : 0;
> } else if (property == config->dpms_property) {
> - *val = connector->dpms;
> + if (state->crtc && state->crtc->state->self_refresh_active)
> + *val = DRM_MODE_DPMS_ON;
> + else
> + *val = connector->dpms;
> } else if (property == config->tv_select_subconnector_property) {
> *val = state->tv.subconnector;
> } else if (property == config->tv_left_margin_property) {
> diff --git a/drivers/gpu/drm/drm_self_refresh_helper.c b/drivers/gpu/drm/drm_self_refresh_helper.c
> new file mode 100644
> index 000000000000..f46e7639d277
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_self_refresh_helper.c
> @@ -0,0 +1,205 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright (C) 2019 Google, Inc.
> + *
> + * Authors:
> + * Sean Paul <seanpaul@chromium.org>
> + */
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_connector.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_mode_config.h>
> +#include <drm/drm_modeset_lock.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_self_refresh_helper.h>
> +#include <linux/bitops.h>
> +#include <linux/slab.h>
> +#include <linux/workqueue.h>
> +
> +/**
> + * DOC: overview
> + *
> + * This helper library provides an easy way for drivers to leverage the atomic
> + * framework to implement panel self refresh (SR) support. Drivers are
> + * responsible for registering and unregistering the SR helpers on load/unload.
I think better if you mention that you both need to set up the CRTC (using
the init/cleanup functions), and also the connector (by setting
&drm_connector.self_refresh_aware).
> + *
> + * Once a crtc has enabled SR, the helpers will monitor activity and
> + * call back into the driver to enable/disable SR as appropriate. The best way
> + * to think about this is that it's a DPMS on/off request with a flag set in
> + * state that tells you to disable/enable SR on the panel instead of power-
> + * cycling it.
> + *
> + * Drivers may choose to fully disable their crtc/encoder/bridge hardware, or
> + * they can use the "self_refresh_active" flags in crtc state if they want to
> + * enter low power mode without full disable (in case full disable/enable is too
> + * slow).
> + *
> + * SR will be deactivated if there are any atomic updates affecting the
> + * pipe that is in SR mode. If a crtc is driving multiple connectors, all
> + * connectors must be SR aware and all will enter SR mode.
I think the above text would be more useful if you spice it up with links
to the relevant functions (init/cleanup and alter_state) plus what to look
at, i.e. &drm_crtc_state.self_refresh_active.
> + */
> +
> +struct drm_self_refresh_data {
> + struct drm_crtc *crtc;
> + struct delayed_work entry_work;
> + struct drm_atomic_state *save_state;
> + unsigned int entry_delay_ms;
> +};
> +
> +static void drm_self_refresh_helper_entry_work(struct work_struct *work)
> +{
> + struct drm_self_refresh_data *sr_data = container_of(
> + to_delayed_work(work),
> + struct drm_self_refresh_data, entry_work);
> + struct drm_crtc *crtc = sr_data->crtc;
> + struct drm_device *dev = crtc->dev;
> + struct drm_modeset_acquire_ctx ctx;
> + struct drm_atomic_state *state;
> + struct drm_connector *conn;
> + struct drm_connector_state *conn_state;
> + struct drm_crtc_state *crtc_state;
> + int i, ret;
> +
> + drm_modeset_acquire_init(&ctx, 0);
> +
> + state = drm_atomic_state_alloc(dev);
> + if (!state) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> +retry:
> + state->acquire_ctx = &ctx;
> +
> + crtc_state = drm_atomic_get_crtc_state(state, crtc);
> + if (IS_ERR(crtc_state)) {
> + ret = PTR_ERR(crtc_state);
> + goto out;
> + }
> +
> + if (!crtc_state->enable)
> + goto out;
> +
> + ret = drm_atomic_add_affected_connectors(state, crtc);
> + if (ret)
> + goto out;
> +
> + for_each_new_connector_in_state(state, conn, conn_state, i) {
> + if (!conn_state->self_refresh_aware)
> + goto out;
> + }
> +
> + crtc_state->active = false;
> + crtc_state->self_refresh_active = true;
> +
> + ret = drm_atomic_commit(state);
> + if (ret)
> + goto out;
> +
> +out:
> + if (ret == -EDEADLK) {
> + drm_atomic_state_clear(state);
> + ret = drm_modeset_backoff(&ctx);
> + if (!ret)
> + goto retry;
> + }
> +
> + drm_atomic_state_put(state);
> + drm_modeset_drop_locks(&ctx);
> + drm_modeset_acquire_fini(&ctx);
> +}
> +
> +/**
> + * drm_self_refresh_helper_alter_state - Alters the atomic state for SR exit
> + * @state: the state currently being checked
> + *
> + * Called at the end of atomic check. This function checks the state for flags
> + * incompatible with self refresh exit and changes them. This is a bit
> + * disingenuous since userspace is expecting one thing and we're giving it
> + * another. However in order to keep self refresh entirely hidden from
> + * userspace, this is required.
> + *
> + * At the end, we queue up the self refresh entry work so we can enter PSR after
> + * the desired delay.
> + */
> +void drm_self_refresh_helper_alter_state(struct drm_atomic_state *state)
> +{
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *crtc_state;
> + int i;
> +
> + if (state->async_update || !state->allow_modeset) {
> + for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
> + if (crtc_state->self_refresh_active) {
> + state->async_update = false;
> + state->allow_modeset = true;
> + break;
> + }
> + }
> + }
> +
> + for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
> + struct drm_self_refresh_data *sr_data;
> +
> + /* Don't trigger the entry timer when we're already in SR */
> + if (crtc_state->self_refresh_active)
> + continue;
> +
> + sr_data = crtc->self_refresh_data;
> + if (!sr_data)
> + continue;
> +
> + mod_delayed_work(system_wq, &sr_data->entry_work,
> + msecs_to_jiffies(sr_data->entry_delay_ms));
> + }
> +}
> +EXPORT_SYMBOL(drm_self_refresh_helper_alter_state);
> +
> +/**
> + * drm_self_refresh_helper_register - Registers self refresh helpers for a crtc
> + * @crtc: the crtc which supports self refresh supported displays
> + * @entry_delay_ms: amount of inactivity to wait before entering self refresh
> + */
> +int drm_self_refresh_helper_register(struct drm_crtc *crtc,
> + unsigned int entry_delay_ms)
> +{
Bikeshed that I missed in previous rounds: _register/_unregister has
pretty clear meaning of "(un)publish an interface to userspace".
_init/_cleanup are the common ones.
> + struct drm_self_refresh_data *sr_data = crtc->self_refresh_data;
> +
> + /* Helper is already registered */
> + if (WARN_ON(sr_data))
> + return -EINVAL;
> +
> + sr_data = kzalloc(sizeof(*sr_data), GFP_KERNEL);
> + if (!sr_data)
> + return -ENOMEM;
> +
> + INIT_DELAYED_WORK(&sr_data->entry_work,
> + drm_self_refresh_helper_entry_work);
> + sr_data->entry_delay_ms = entry_delay_ms;
> + sr_data->crtc = crtc;
> +
> + crtc->self_refresh_data = sr_data;
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_self_refresh_helper_register);
> +
> +/**
> + * drm_self_refresh_helper_unregister - Unregisters self refresh helpers
> + * @crtc: the crtc to unregister
> + */
> +void drm_self_refresh_helper_unregister(struct drm_crtc *crtc)
> +{
> + struct drm_self_refresh_data *sr_data = crtc->self_refresh_data;
> +
> + /* Helper is already unregistered */
> + if (sr_data)
> + return;
> +
> + crtc->self_refresh_data = NULL;
> +
> + cancel_delayed_work_sync(&sr_data->entry_work);
> + kfree(sr_data);
> +}
> +EXPORT_SYMBOL(drm_self_refresh_helper_unregister);
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index 824a5ed4e216..1e9cab1da97a 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -944,4 +944,19 @@ drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
> state->connectors_changed;
> }
>
> +/**
> + * drm_atomic_crtc_effectively_active - compute whether crtc is actually active
> + * @state: &drm_crtc_state for the CRTC
> + *
> + * When in self refresh mode, the crtc_state->active value will be false, since
> + * the crtc is off. However in some cases we're interested in whether the crtc
> + * is active, or effectively active (ie: it's connected to an active display).
> + * In these cases, use this function instead of just checking active.
> + */
> +static inline bool
> +drm_atomic_crtc_effectively_active(const struct drm_crtc_state *state)
> +{
> + return state->active || state->self_refresh_active;
> +}
> +
> #endif /* DRM_ATOMIC_H_ */
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 02a131202add..9b40eb6f0ef4 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -539,6 +539,20 @@ struct drm_connector_state {
> /** @tv: TV connector state */
> struct drm_tv_connector_state tv;
>
> + /**
> + * @self_refresh_aware:
> + *
> + * This tracks whether a connector is aware of the self refresh state.
> + * It should be set to true for those connector implementations which
> + * understand the self refresh state. This is needed since the crtc
> + * registers the self refresh helpers and it doesn't know if the
> + * connectors downstream have implemented self refresh entry/exit.
> + *
> + * Drivers should set this to true in atomic_check if they know how to
> + * handle self_refresh requests.
> + */
> + bool self_refresh_aware;
> +
> /**
> * @picture_aspect_ratio: Connector property to control the
> * HDMI infoframe aspect ratio setting.
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 58ad983d7cd6..67e3075a8784 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -53,6 +53,7 @@ struct drm_mode_set;
> struct drm_file;
> struct drm_clip_rect;
> struct drm_printer;
> +struct drm_self_refresh_data;
> struct device_node;
> struct dma_fence;
> struct edid;
> @@ -299,6 +300,17 @@ struct drm_crtc_state {
> */
> bool vrr_enabled;
>
> + /**
> + * @self_refresh_active:
> + *
> + * Used by the self refresh helpers to denote when a self refresh
> + * transition is occuring. This will be set on enable/disable callbacks
> + * when self refresh is being enabled or disabled. In some cases, it may
> + * not be desirable to fully shut off the crtc during self refresh.
> + * CRTC's can inspect this flag and determine the best course of action.
> + */
> + bool self_refresh_active;
> +
> /**
> * @event:
> *
> @@ -1087,6 +1099,13 @@ struct drm_crtc {
> * The name of the CRTC's fence timeline.
> */
> char timeline_name[32];
> +
> + /**
> + * @self_refresh_data: Holds the state for the self refresh helpers
> + *
> + * Initialized via drm_self_refresh_helper_register().
> + */
> + struct drm_self_refresh_data *self_refresh_data;
> };
>
> /**
> diff --git a/include/drm/drm_self_refresh_helper.h b/include/drm/drm_self_refresh_helper.h
> new file mode 100644
> index 000000000000..efb2e6e3249f
> --- /dev/null
> +++ b/include/drm/drm_self_refresh_helper.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright (C) 2019 Google, Inc.
> + *
> + * Authors:
> + * Sean Paul <seanpaul@chromium.org>
> + */
> +#ifndef DRM_SELF_REFRESH_HELPER_H_
> +#define DRM_SELF_REFRESH_HELPER_H_
> +
> +struct drm_atomic_state;
> +struct drm_connector;
> +struct drm_device;
> +struct drm_modeset_acquire_ctx;
> +
> +void drm_self_refresh_helper_alter_state(struct drm_atomic_state *state);
> +
> +int drm_self_refresh_helper_register(struct drm_crtc *crtc,
> + unsigned int entry_delay_ms);
> +
> +void drm_self_refresh_helper_unregister(struct drm_crtc *crtc);
> +#endif
With the remaining nits addressed: Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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