You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
3.2 KiB
Diff
101 lines
3.2 KiB
Diff
From 67dd4d137557909279a21c1b5de87a24c84903f9 Mon Sep 17 00:00:00 2001
|
|
From: Giedrius <giedrius@blokas.io>
|
|
Date: Tue, 7 Jan 2020 11:04:21 +0200
|
|
Subject: [PATCH] Pisound: MIDI communication fixes for scaled down
|
|
CPU.
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
* Increased maximum SPI communication speed to avoid running too slow
|
|
when the CPU is scaled down and losing MIDI data.
|
|
|
|
* Keep track of buffer usage in millibytes for higher precision.
|
|
|
|
Signed-off-by: Giedrius Trainavičius <giedrius@blokas.io>
|
|
---
|
|
sound/soc/bcm/pisound.c | 31 ++++++++++++++++++-------------
|
|
1 file changed, 18 insertions(+), 13 deletions(-)
|
|
|
|
--- a/sound/soc/bcm/pisound.c
|
|
+++ b/sound/soc/bcm/pisound.c
|
|
@@ -1,6 +1,6 @@
|
|
/*
|
|
* Pisound Linux kernel module.
|
|
- * Copyright (C) 2016-2019 Vilniaus Blokas UAB, https://blokas.io/pisound
|
|
+ * Copyright (C) 2016-2020 Vilniaus Blokas UAB, https://blokas.io/pisound
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
@@ -326,7 +326,7 @@ static void spi_transfer(const uint8_t *
|
|
transfer.tx_buf = txbuf;
|
|
transfer.rx_buf = rxbuf;
|
|
transfer.len = len;
|
|
- transfer.speed_hz = 100000;
|
|
+ transfer.speed_hz = 150000;
|
|
transfer.delay_usecs = 10;
|
|
spi_message_add_tail(&transfer, &msg);
|
|
|
|
@@ -403,9 +403,9 @@ static struct spi_device *pisnd_spi_find
|
|
static void pisnd_work_handler(struct work_struct *work)
|
|
{
|
|
enum { TRANSFER_SIZE = 4 };
|
|
- enum { PISOUND_OUTPUT_BUFFER_SIZE = 128 };
|
|
- enum { MIDI_BYTES_PER_SECOND = 3125 };
|
|
- int out_buffer_used = 0;
|
|
+ enum { PISOUND_OUTPUT_BUFFER_SIZE_MILLIBYTES = 127 * 1000 };
|
|
+ enum { MIDI_MILLIBYTES_PER_JIFFIE = (3125 * 1000) / HZ };
|
|
+ int out_buffer_used_millibytes = 0;
|
|
unsigned long now;
|
|
uint8_t val;
|
|
uint8_t txbuf[TRANSFER_SIZE];
|
|
@@ -445,7 +445,9 @@ static void pisnd_work_handler(struct wo
|
|
had_data = false;
|
|
memset(txbuf, 0, sizeof(txbuf));
|
|
for (i = 0; i < sizeof(txbuf) &&
|
|
- out_buffer_used < PISOUND_OUTPUT_BUFFER_SIZE;
|
|
+ ((out_buffer_used_millibytes+1000 <
|
|
+ PISOUND_OUTPUT_BUFFER_SIZE_MILLIBYTES) ||
|
|
+ g_ledFlashDurationChanged);
|
|
i += 2) {
|
|
|
|
val = 0;
|
|
@@ -458,7 +460,7 @@ static void pisnd_work_handler(struct wo
|
|
} else if (kfifo_get(&spi_fifo_out, &val)) {
|
|
txbuf[i+0] = 0x0f;
|
|
txbuf[i+1] = val;
|
|
- ++out_buffer_used;
|
|
+ out_buffer_used_millibytes += 1000;
|
|
}
|
|
}
|
|
|
|
@@ -469,12 +471,14 @@ static void pisnd_work_handler(struct wo
|
|
* rate.
|
|
*/
|
|
now = jiffies;
|
|
- out_buffer_used -=
|
|
- (MIDI_BYTES_PER_SECOND / HZ) /
|
|
- (now - last_transfer_at);
|
|
- if (out_buffer_used < 0)
|
|
- out_buffer_used = 0;
|
|
- last_transfer_at = now;
|
|
+ if (now != last_transfer_at) {
|
|
+ out_buffer_used_millibytes -=
|
|
+ (now - last_transfer_at) *
|
|
+ MIDI_MILLIBYTES_PER_JIFFIE;
|
|
+ if (out_buffer_used_millibytes < 0)
|
|
+ out_buffer_used_millibytes = 0;
|
|
+ last_transfer_at = now;
|
|
+ }
|
|
|
|
for (i = 0; i < sizeof(rxbuf); i += 2) {
|
|
if (rxbuf[i]) {
|
|
@@ -489,6 +493,7 @@ static void pisnd_work_handler(struct wo
|
|
|| !kfifo_is_empty(&spi_fifo_out)
|
|
|| pisnd_spi_has_more()
|
|
|| g_ledFlashDurationChanged
|
|
+ || out_buffer_used_millibytes != 0
|
|
);
|
|
|
|
if (!kfifo_is_empty(&spi_fifo_in) && g_recvCallback)
|