Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 136 insertions, 0 deletions

diff --git a/fs/jffs2/compr_rtime.c b/fs/jffs2/compr_rtime.c
new file mode 100644
index 000000000..3bd9d2f3b
--- /dev/null
+++ b/fs/jffs2/compr_rtime.c
@@ -0,0 +1,136 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ * Created by Arjan van de Ven <arjanv@redhat.com>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ *
+ *
+ * Very simple lz77-ish encoder.
+ *
+ * Theory of operation: Both encoder and decoder have a list of "last
+ * occurrences" for every possible source-value; after sending the
+ * first source-byte, the second byte indicated the "run" length of
+ * matches
+ *
+ * The algorithm is intended to only send "whole bytes", no bit-messing.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/jffs2.h>
+#include "compr.h"
+
+/* _compress returns the compressed size, -1 if bigger */
+static int jffs2_rtime_compress(unsigned char *data_in,
+				unsigned char *cpage_out,
+				uint32_t *sourcelen, uint32_t *dstlen)
+{
+	unsigned short positions[256];
+	int outpos = 0;
+	int pos=0;
+
+	if (*dstlen <= 3)
+		return -1;
+
+	memset(positions,0,sizeof(positions));
+
+	while (pos < (*sourcelen) && outpos <= (*dstlen)-2) {
+		int backpos, runlen=0;
+		unsigned char value;
+
+		value = data_in[pos];
+
+		cpage_out[outpos++] = data_in[pos++];
+
+		backpos = positions[value];
+		positions[value]=pos;
+
+		while ((backpos < pos) && (pos < (*sourcelen)) &&
+		       (data_in[pos]==data_in[backpos++]) && (runlen<255)) {
+			pos++;
+			runlen++;
+		}
+		cpage_out[outpos++] = runlen;
+	}
+
+	if (outpos >= pos) {
+		/* We failed */
+		return -1;
+	}
+
+	/* Tell the caller how much we managed to compress, and how much space it took */
+	*sourcelen = pos;
+	*dstlen = outpos;
+	return 0;
+}
+
+
+static int jffs2_rtime_decompress(unsigned char *data_in,
+				  unsigned char *cpage_out,
+				  uint32_t srclen, uint32_t destlen)
+{
+	unsigned short positions[256];
+	int outpos = 0;
+	int pos=0;
+
+	memset(positions,0,sizeof(positions));
+
+	while (outpos<destlen) {
+		unsigned char value;
+		int backoffs;
+		int repeat;
+
+		value = data_in[pos++];
+		cpage_out[outpos++] = value; /* first the verbatim copied byte */
+		repeat = data_in[pos++];
+		backoffs = positions[value];
+
+		positions[value]=outpos;
+		if (repeat) {
+			if ((outpos + repeat) > destlen) {
+				return 1;
+			}
+			if (backoffs + repeat >= outpos) {
+				while(repeat) {
+					cpage_out[outpos++] = cpage_out[backoffs++];
+					repeat--;
+				}
+			} else {
+				memcpy(&cpage_out[outpos],&cpage_out[backoffs],repeat);
+				outpos+=repeat;
+			}
+		}
+	}
+	return 0;
+}
+
+static struct jffs2_compressor jffs2_rtime_comp = {
+    .priority = JFFS2_RTIME_PRIORITY,
+    .name = "rtime",
+    .compr = JFFS2_COMPR_RTIME,
+    .compress = &jffs2_rtime_compress,
+    .decompress = &jffs2_rtime_decompress,
+#ifdef JFFS2_RTIME_DISABLED
+    .disabled = 1,
+#else
+    .disabled = 0,
+#endif
+};
+
+int jffs2_rtime_init(void)
+{
+    return jffs2_register_compressor(&jffs2_rtime_comp);
+}
+
+void jffs2_rtime_exit(void)
+{
+    jffs2_unregister_compressor(&jffs2_rtime_comp);
+}