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Tue, 26 Nov 2019 17:31:49 -0800 Received: from MTKMBS31N1.mediatek.inc (172.27.4.69) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 26 Nov 2019 17:31:55 -0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 27 Nov 2019 09:31:44 +0800 Received: from [172.21.77.4] (172.21.77.4) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 27 Nov 2019 09:30:52 +0800 Message-ID: <1574818303.15691.10.camel@mtksdaap41> Subject: Re: [PATCH v1] drm/mediatek: fix up 1440x900 dp display black screen issue From: CK Hu To: Date: Wed, 27 Nov 2019 09:31:43 +0800 In-Reply-To: <1574750869-12611-1-git-send-email-yongqiang.niu@mediatek.com> References: <1574750869-12611-1-git-send-email-yongqiang.niu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: B6B9FEC13DEDCAA3FED78A3946FCFD3C5E46997A32C15BEB208086C51E86B01A2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191126_173155_410962_18FAC317 X-CRM114-Status: GOOD ( 14.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Philipp Zabel , David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Rob Herring , linux-mediatek@lists.infradead.org, Daniel Vetter , Matthias Brugger , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Yongqiang: On Tue, 2019-11-26 at 14:47 +0800, yongqiang.niu@mediatek.com wrote: > From: Yongqiang Niu > > This patch fix up 1440x900 dp display black screen issue > the computed result will overflow rdma1 fifo max size > when external display pixel clock bigger than 74MHZ > > Signed-off-by: Yongqiang Niu > --- > 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 c1abde3..41143f5 100644 > --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c > +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c > @@ -152,6 +152,10 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, 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; > + This looks like that threshold is over spec. I think this FIFO is used to cover the latency of reading data from DRAM. When data is read from OVL not RDMA, OVL already has a FIFO, so RDMA FIFO is useless. So I think you should set threshold to a special value when RDMA is in direct link mode. Regards, CK > reg = RDMA_FIFO_UNDERFLOW_EN | > RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) | > RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold); _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel