From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Fri, 10 Apr 2015 09:48:36 +0000 (+0300)
Subject: OMAPDSS: DISPC: fix 64 bit issue in 5-tap
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c582935c00227b4efc79630b149b1f077d7716b2;p=linux-beck.git

OMAPDSS: DISPC: fix 64 bit issue in 5-tap

The DISPC driver uses 64 bit arithmetic to calculate the required clock
rate for scaling. The code does not seem to work correctly, and instead
calculates with 32 bit numbers, giving wrong result.

Fix the code by typecasting values to u64 first, so that the
calculations do happen in 64 bits.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---

diff --git a/drivers/video/fbdev/omap2/dss/dispc.c b/drivers/video/fbdev/omap2/dss/dispc.c
index 4488d9367bd3..2db1c986e989 100644
--- a/drivers/video/fbdev/omap2/dss/dispc.c
+++ b/drivers/video/fbdev/omap2/dss/dispc.c
@@ -2166,7 +2166,7 @@ static unsigned long calc_core_clk_five_taps(unsigned long pclk,
 	if (height > out_height) {
 		unsigned int ppl = mgr_timings->x_res;
 
-		tmp = pclk * height * out_width;
+		tmp = (u64)pclk * height * out_width;
 		do_div(tmp, 2 * out_height * ppl);
 		core_clk = tmp;
 
@@ -2174,14 +2174,14 @@ static unsigned long calc_core_clk_five_taps(unsigned long pclk,
 			if (ppl == out_width)
 				return 0;
 
-			tmp = pclk * (height - 2 * out_height) * out_width;
+			tmp = (u64)pclk * (height - 2 * out_height) * out_width;
 			do_div(tmp, 2 * out_height * (ppl - out_width));
 			core_clk = max_t(u32, core_clk, tmp);
 		}
 	}
 
 	if (width > out_width) {
-		tmp = pclk * width;
+		tmp = (u64)pclk * width;
 		do_div(tmp, out_width);
 		core_clk = max_t(u32, core_clk, tmp);