Hi, Hsin-Yi: On Wed, 2021-01-27 at 12:54 +0800, Hsin-Yi Wang wrote: > From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> > > This patch add RDMA fifo size error handle > rdma fifo size will not always bigger than the calculated threshold > if that case happened, we need set fifo size as the threshold > > Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> > Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> > --- > drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c > index b84004394970f..04b9542010b00 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c > @@ -168,6 +168,10 @@ void mtk_rdma_config(struct device *dev, unsigned int width, > * account for blanking, and with a pixel depth of 4 bytes: > */ > threshold = width * height * vrefresh * 4 * 7 / 1000000; > + > + if (threshold > rdma_fifo_size) > + threshold = rdma_fifo_size; Please see the discussion in [1]. [1] https://patchwork.kernel.org/project/linux-mediatek/patch/1607591262-21736-6-git-send-email-yongqiang.niu@xxxxxxxxxxxx/ Regards, CK > + > reg = RDMA_FIFO_UNDERFLOW_EN | > RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) | > RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
