[PATCH] drm: mediatek: change the variable type of rdma threshold

[PATCH] drm: mediatek: change the variable type of rdma threshold

[Bibby Hsieh]

For some greater resolution, the rdma threshold
variable will overflow.

Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 0df05f9..2718413 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -109,7 +109,7 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
 			    unsigned int height, unsigned int vrefresh,
 			    unsigned int bpc)
 {
-	unsigned int threshold;
+	unsigned long long threshold;
 	unsigned int reg;
 
 	rdma_update_bits(comp, DISP_REG_RDMA_SIZE_CON_0, 0xfff, width);
@@ -121,10 +121,11 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
 	 * output threshold to 6 microseconds with 7/6 overhead to
 	 * account for blanking, and with a pixel depth of 4 bytes:
 	 */
-	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	threshold = (unsigned long long)width * height * vrefresh *
+		    4 * 7 / 1000000;
 	reg = RDMA_FIFO_UNDERFLOW_EN |
 	      RDMA_FIFO_PSEUDO_SIZE(SZ_8K) |
-	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
+	      (unsigned int)RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
 	writel(reg, comp->regs + DISP_REG_RDMA_FIFO_CON);
 }
 
-- 
1.9.1

Re: [PATCH] drm: mediatek: change the variable type of rdma threshold

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 956 bytes --]

Hi Bibby,

[auto build test ERROR on v4.9-rc8]
[cannot apply to drm/drm-next next-20170510]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Bibby-Hsieh/drm-mediatek-change-the-variable-type-of-rdma-threshold/20170510-114823
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

>> ERROR: "__aeabi_uldivmod" [drivers/gpu/drm/mediatek/mediatek-drm.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 59469 bytes --]