Fixed MTP to work with TWRP

include/drm/drm_os_linux.h

@@ -0,0 +1,65 @@
+/**
+ * \file drm_os_linux.h
+ * OS abstraction macros.
+ */
+
+#include <linux/interrupt.h>	/* For task queue support */
+#include <linux/delay.h>
+
+#ifndef readq
+static inline u64 readq(void __iomem *reg)
+{
+	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
+}
+
+static inline void writeq(u64 val, void __iomem *reg)
+{
+	writel(val & 0xffffffff, reg);
+	writel(val >> 32, reg + 0x4UL);
+}
+#endif
+
+/** Current process ID */
+#define DRM_CURRENTPID			task_pid_nr(current)
+#define DRM_UDELAY(d)			udelay(d)
+/** Read a byte from a MMIO region */
+#define DRM_READ8(map, offset)		readb(((void __iomem *)(map)->handle) + (offset))
+/** Read a word from a MMIO region */
+#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
+/** Read a dword from a MMIO region */
+#define DRM_READ32(map, offset)		readl(((void __iomem *)(map)->handle) + (offset))
+/** Write a byte into a MMIO region */
+#define DRM_WRITE8(map, offset, val)	writeb(val, ((void __iomem *)(map)->handle) + (offset))
+/** Write a word into a MMIO region */
+#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
+/** Write a dword into a MMIO region */
+#define DRM_WRITE32(map, offset, val)	writel(val, ((void __iomem *)(map)->handle) + (offset))
+
+/** Read a qword from a MMIO region - be careful using these unless you really understand them */
+#define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))
+/** Write a qword into a MMIO region */
+#define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset))
+
+#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
+do {								\
+	DECLARE_WAITQUEUE(entry, current);			\
+	unsigned long end = jiffies + (timeout);		\
+	add_wait_queue(&(queue), &entry);			\
+								\
+	for (;;) {						\
+		__set_current_state(TASK_INTERRUPTIBLE);	\
+		if (condition)					\
+			break;					\
+		if (time_after_eq(jiffies, end)) {		\
+			ret = -EBUSY;				\
+			break;					\
+		}						\
+		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
+		if (signal_pending(current)) {			\
+			ret = -EINTR;				\
+			break;					\
+		}						\
+	}							\
+	__set_current_state(TASK_RUNNING);			\
+	remove_wait_queue(&(queue), &entry);			\
+} while (0)