staging: sm750fb: refactor method and fix potential type inconsistence

Commit Message

Lynn Lei July 2, 2017, 2:27 p.m. UTC

make reg variable typed `u32' not `unsigned int'
this can fix potential type inconsistence in some platforms

refactor swPanelPowerSequence() make the code less redundant

a early check for disp to skip unnecessary delay

Signed-off-by: Lynn Lei <[e-mail]>
---
 drivers/staging/sm750fb/ddk750_display.c | 36 ++++++++++++++------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

Comments

Greg KH July 3, 2017, 6:22 a.m. UTC | #1

On Sun, Jul 02, 2017 at 10:27:40PM +0800, Lynn Lei wrote:
> make reg variable typed `u32' not `unsigned int'
> this can fix potential type inconsistence in some platforms

It can?  What platform?

> 
> refactor swPanelPowerSequence() make the code less redundant
> 
> a early check for disp to skip unnecessary delay

Only do one thing per patch please.

thanks,

greg k-h
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Patch

diff --git a/drivers/staging/sm750fb/ddk750_display.c b/drivers/staging/sm750fb/ddk750_display.c
index 9b116ed6ecc7..0f666dc2729a 100644
--- a/drivers/staging/sm750fb/ddk750_display.c
+++ b/drivers/staging/sm750fb/ddk750_display.c
@@ -86,28 +86,24 @@  static void primary_wait_vertical_sync(int delay)
 
 static void swPanelPowerSequence(int disp, int delay)
 {
-	unsigned int reg;
+	u32 reg;
+	u32 opt[] = {
+		PANEL_DISPLAY_CTRL_FPEN, PANEL_DISPLAY_CTRL_DATA,
+		PANEL_DISPLAY_CTRL_VBIASEN, PANEL_DISPLAY_CTRL_FPEN,
+	};
+	u32 size, i;
+
+	if (disp == 0)
+		return;
+
+	size = sizeof(opt) / sizeof(u32);
 
 	/* disp should be 1 to open sequence */
-	reg = peek32(PANEL_DISPLAY_CTRL);
-	reg |= (disp ? PANEL_DISPLAY_CTRL_FPEN : 0);
-	poke32(PANEL_DISPLAY_CTRL, reg);
-	primary_wait_vertical_sync(delay);
-
-	reg = peek32(PANEL_DISPLAY_CTRL);
-	reg |= (disp ? PANEL_DISPLAY_CTRL_DATA : 0);
-	poke32(PANEL_DISPLAY_CTRL, reg);
-	primary_wait_vertical_sync(delay);
-
-	reg = peek32(PANEL_DISPLAY_CTRL);
-	reg |= (disp ? PANEL_DISPLAY_CTRL_VBIASEN : 0);
-	poke32(PANEL_DISPLAY_CTRL, reg);
-	primary_wait_vertical_sync(delay);
-
-	reg = peek32(PANEL_DISPLAY_CTRL);
-	reg |= (disp ? PANEL_DISPLAY_CTRL_FPEN : 0);
-	poke32(PANEL_DISPLAY_CTRL, reg);
-	primary_wait_vertical_sync(delay);
+	for (i = 0; i < size; i++) {
+		reg = peek32(PANEL_DISPLAY_CTRL) | opt[i];
+		poke32(PANEL_DISPLAY_CTRL, reg);
+		primary_wait_vertical_sync(delay);
+	}
 }
 
 void ddk750_setLogicalDispOut(disp_output_t output)