disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/via/via_drv.h
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..
@@ -24,8 +24,16 @@
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 #ifndef _VIA_DRV_H_
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 #define _VIA_DRV_H_
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-#include <drm/drm_mm.h>
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+#include <linux/irqreturn.h>
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+#include <linux/jiffies.h>
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+#include <linux/sched.h>
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+#include <linux/sched/signal.h>
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+#include <linux/wait.h>
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+
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+#include <drm/drm_ioctl.h>
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 #include <drm/drm_legacy.h>
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+#include <drm/drm_mm.h>
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+#include <drm/via_drm.h>
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 #define DRIVER_AUTHOR	"Various"
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..
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@@ -113,12 +121,67 @@
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 };
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 /* VIA MMIO register access */
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-#define VIA_BASE ((dev_priv->mmio))
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+static inline u32 via_read(struct drm_via_private *dev_priv, u32 reg)
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+{
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+	return readl((void __iomem *)(dev_priv->mmio->handle + reg));
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+}
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-#define VIA_READ(reg)		DRM_READ32(VIA_BASE, reg)
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-#define VIA_WRITE(reg, val)	DRM_WRITE32(VIA_BASE, reg, val)
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-#define VIA_READ8(reg)		DRM_READ8(VIA_BASE, reg)
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-#define VIA_WRITE8(reg, val)	DRM_WRITE8(VIA_BASE, reg, val)
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+static inline void via_write(struct drm_via_private *dev_priv, u32 reg,
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+			     u32 val)
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+{
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+	writel(val, (void __iomem *)(dev_priv->mmio->handle + reg));
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+}
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+
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+static inline void via_write8(struct drm_via_private *dev_priv, u32 reg,
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+			      u32 val)
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+{
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+	writeb(val, (void __iomem *)(dev_priv->mmio->handle + reg));
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+}
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+
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+static inline void via_write8_mask(struct drm_via_private *dev_priv,
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+				   u32 reg, u32 mask, u32 val)
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+{
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+	u32 tmp;
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+
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+	tmp = readb((void __iomem *)(dev_priv->mmio->handle + reg));
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+	tmp = (tmp & ~mask) | (val & mask);
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+	writeb(tmp, (void __iomem *)(dev_priv->mmio->handle + reg));
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+}
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+
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+/*
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+ * Poll in a loop waiting for 'contidition' to be true.
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+ * Note: A direct replacement with wait_event_interruptible_timeout()
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+ *       will not work unless driver is updated to emit wake_up()
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+ *       in relevant places that can impact the 'condition'
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+ *
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+ * Returns:
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+ *   ret keeps current value if 'condition' becomes true
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+ *   ret = -BUSY if timeout happens
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+ *   ret = -EINTR if a signal interrupted the waiting period
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+ */
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+#define VIA_WAIT_ON( ret, queue, timeout, condition )		\
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+do {								\
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+	DECLARE_WAITQUEUE(entry, current);			\
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+	unsigned long end = jiffies + (timeout);		\
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+	add_wait_queue(&(queue), &entry);			\
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+								\
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+	for (;;) {						\
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+		__set_current_state(TASK_INTERRUPTIBLE);	\
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+		if (condition)					\
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+			break;					\
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+		if (time_after_eq(jiffies, end)) {		\
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+			ret = -EBUSY;				\
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+			break;					\
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+		}						\
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+		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
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+		if (signal_pending(current)) {			\
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+			ret = -EINTR;				\
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+			break;					\
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+		}						\
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+	}							\
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+	__set_current_state(TASK_RUNNING);			\
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+	remove_wait_queue(&(queue), &entry);			\
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+} while (0)
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 extern const struct drm_ioctl_desc via_ioctls[];
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 extern int via_max_ioctl;