kernel/linux.git/sound/drivers/pcsp, branch v6.6.131

ALSA: pcsp: Make hrtimer forwarding more robust

2021-09-28T08:58:08+00:00

The hrtimer callback pcsp_do_timer() prepares rearming of the timer with hrtimer_forward(). hrtimer_forward() is intended to provide a mechanism to forward the expiry time of the hrtimer by a multiple of the period argument so that the expiry time greater than the time provided in the 'now' argument. pcsp_do_timer() invokes hrtimer_forward() with the current timer expiry time as 'now' argument. That's providing a periodic timer expiry, but is not really robust when the timer callback is delayed so that the resulting new expiry time is already in the past which causes the callback to be invoked immediately again. If the timer is delayed then the back to back invocation is not really making it better than skipping the missed periods. Sound is distorted in any case. Use hrtimer_forward_now() which ensures that the next expiry is in the future. This prevents hogging the CPU in the timer expiry code and allows later on to remove hrtimer_forward() from the public interfaces. Signed-off-by: Thomas Gleixner Cc: alsa-devel@alsa-project.org Cc: Takashi Iwai Cc: Jaroslav Kysela Link: https://lore.kernel.org/r/20210923153339.623208460@linutronix.de Signed-off-by: Takashi Iwai

ALSA: pcsp: Allocate resources with device-managed APIs

2021-07-19T14:17:32+00:00

Use the new snd_devm_card_new() for the card object allocation and the devres version for the input device, and clean up the superfluous remove callback. Link: https://lore.kernel.org/r/20210715075941.23332-80-tiwai@suse.de Signed-off-by: Takashi Iwai

module: remove never implemented MODULE_SUPPORTED_DEVICE

2021-03-17T20:16:18+00:00

MODULE_SUPPORTED_DEVICE was added in pre-git era and never was implemented. We can safely remove it, because the kernel has grown to have many more reliable mechanisms to determine if device is supported or not. Signed-off-by: Leon Romanovsky Signed-off-by: Linus Torvalds

ALSA: pcsp: Fix fall-through warnings for Clang

2020-11-21T08:29:25+00:00

In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning by explicitly adding a break statement instead of letting the code fall through to the next case. Link: https://github.com/KSPP/linux/issues/115 Signed-off-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/9705120ac2310bb20035e375862410413359611d.1605896059.git.gustavoars@kernel.org Signed-off-by: Takashi Iwai

ALSA: pcsp: Replace tasklet with work

2020-09-09T16:32:37+00:00

The tasklet is an old API that should be deprecated, usually can be converted to another decent API. This patch replaces the usage of tasklet in pcsp driver with a simple work. In pcsp driver, a global tasklet is used for offloading the period-elapse handling in the hrtimer callback (introduced in commit 96c7d478efad "ALSA: pcsp - Fix locking messes in snd-pcsp"). It can be achieved gracefully with a work queued in the high-prio system workqueue. This also changes tasklet_kill() with cancel_work_sync() in the sync_stop callback, which is anyway better to assure canceling the pending tasks. Link: https://lore.kernel.org/r/20200903104131.21097-2-tiwai@suse.de Signed-off-by: Takashi Iwai

treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()

2020-07-30T18:15:58+00:00

This converts all the existing DECLARE_TASKLET() (and ...DISABLED) macros with DECLARE_TASKLET_OLD() in preparation for refactoring the tasklet callback type. All existing DECLARE_TASKLET() users had a "0" data argument, it has been removed here as well. Reviewed-by: Greg Kroah-Hartman Acked-by: Thomas Gleixner Signed-off-by: Kees Cook

ALSA: drivers: Constify snd_kcontrol_new items

2020-01-03T08:24:23+00:00

Most of snd_kcontrol_new definitions are read-only and passed as-is. Let's declare them as const for further optimization. Constify snd_kcontrol_new items There should be no functional changes by this patch. Link: https://lore.kernel.org/r/20200103081714.9560-34-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: drivers: Constify snd_device_ops definitions

2020-01-03T08:23:52+00:00

Now we may declare const for snd_device_ops definitions, so let's do it for optimization. There should be no functional changes by this patch. Link: https://lore.kernel.org/r/20200103081714.9560-6-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: drivers: Drop superfluous ioctl PCM ops

2019-12-11T06:25:26+00:00

PCM core deals the empty ioctl field now as default(*). Let's kill the redundant lines. (*) commit fc033cbf6fb7 ("ALSA: pcm: Allow NULL ioctl ops") Link: https://lore.kernel.org/r/20191210061145.24641-5-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: pcsp: Use managed buffer allocation

2019-12-11T06:24:58+00:00

Clean up the driver with the new managed buffer allocation API. The superfluous snd_pcm_lib_malloc_pages() and snd_pcm_lib_free_pages() are dropped. Link: https://lore.kernel.org/r/20191209094943.14984-8-tiwai@suse.de Signed-off-by: Takashi Iwai