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mailbox: switch to hrtimer for tx_complete polling

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The mailbox core uses jiffy based timer to handle polling for the
transmit completion. If the client/protocol have/support notification
of the last packet transmit completion via ACK packet, then we tick the
Tx state machine immediately in the callback. However if the client
doesn't support that mechanism we might end-up waiting for atleast a
jiffy even though the remote is ready to receive the next request.

This patch switches the timer used for that polling from jiffy-based
to hrtimer-based so that we can support polling at much higher time
resolution.

Reported-and-suggested-by: Juri Lelli <Juri.Lelli@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Sudeep Holla 2015-07-31 11:48:05 +01:00 • committed by Jassi Brar
parent 63d5e127de
commit 0cc67945ea
2 changed files with 19 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

7
include/linux/mailbox_controller.h
View file

@ -9,7 +9,7 @@
#include <linux/of.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/hrtimer.h>
#include <linux/device.h>
#include <linux/completion.h>
@ -67,7 +67,8 @@ struct mbox_chan_ops {
* @txpoll_period: If 'txdone_poll' is in effect, the API polls for
* last TX's status after these many millisecs
* @of_xlate: Controller driver specific mapping of channel via DT
* @poll: API private. Used to poll for TXDONE on all channels.
* @poll_hrt: API private. hrtimer used to poll for TXDONE on all
* channels.
* @node: API private. To hook into list of controllers.
*/
struct mbox_controller {
@ -81,7 +82,7 @@ struct mbox_controller {
struct mbox_chan *(*of_xlate)(struct mbox_controller *mbox,
const struct of_phandle_args *sp);
/* Internal to API */
struct timer_list poll;
struct hrtimer poll_hrt;
struct list_head node;
};