brcm2708: rename target to bcm27xx

[openwrt/openwrt.git] / target / linux / brcm2708 / patches-4.19 / 950-0785-Pisound-MIDI-communication-fixes-for-scaled-down-CPU.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0785-Pisound-MIDI-communication-fixes-for-scaled-down-CPU.patch b/target/linux/brcm2708/patches-4.19/950-0785-Pisound-MIDI-communication-fixes-for-scaled-down-CPU.patch
deleted file mode 100644 (file)
index c363e1d..0000000
--- a/target/linux/brcm2708/patches-4.19/950-0785-Pisound-MIDI-communication-fixes-for-scaled-down-CPU.patch
+++ /dev/null
@@ -1,100 +0,0 @@
-From 5b12b655f266ea29e91a7b7a46385df05bb70ed8 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)