Merge branch 'drm-fixes-5.0' of git://people.freedesktop.org/~agd5f/linux into drm...

[linux-2.6-block.git] / drivers / gpu / ipu-v3 / ipu-pre.c

diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c
index 2f8db9d625514928006c6b31adeccbe312514ef3..4a28f3fbb0a28c55630be20edbb8c2df4de74645 100644 (file)
--- a/drivers/gpu/ipu-v3/ipu-pre.c
+++ b/drivers/gpu/ipu-v3/ipu-pre.c
@@ -106,6 +106,7 @@ struct ipu_pre {
        void                    *buffer_virt;
        bool                    in_use;
        unsigned int            safe_window_end;
+       unsigned int            last_bufaddr;
 };
 
 static DEFINE_MUTEX(ipu_pre_list_mutex);
@@ -185,6 +186,7 @@ void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 
        writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
        writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
+       pre->last_bufaddr = bufaddr;
 
        val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) |
              IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) |
@@ -242,7 +244,11 @@ void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
        unsigned short current_yblock;
        u32 val;
 
+       if (bufaddr == pre->last_bufaddr)
+               return;
+
        writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
+       pre->last_bufaddr = bufaddr;
 
        do {
                if (time_after(jiffies, timeout)) {