Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751397AbdL3VFP (ORCPT ); Sat, 30 Dec 2017 16:05:15 -0500 Received: from mailoutvs2.siol.net ([213.250.19.135]:52194 "EHLO mail.siol.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751104AbdL3VCY (ORCPT ); Sat, 30 Dec 2017 16:02:24 -0500 From: Jernej Skrabec To: maxime.ripard@free-electrons.com, airlied@linux.ie, robh+dt@kernel.org, mark.rutland@arm.com, wens@csie.org, architt@codeaurora.org, a.hajda@samsung.com, Laurent.pinchart@ideasonboard.com Cc: mturquette@baylibre.com, sboyd@codeaurora.org, Jose.Abreu@synopsys.com, narmstrong@baylibre.com, jernej.skrabec@siol.net, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-sunxi@googlegroups.com Subject: [PATCH 03/11] drm/bridge/synopsys: dw-hdmi: Enable workaround for v1.32a Date: Sat, 30 Dec 2017 22:01:55 +0100 Message-Id: <20171230210203.24115-4-jernej.skrabec@siol.net> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171230210203.24115-1-jernej.skrabec@siol.net> References: <20171230210203.24115-1-jernej.skrabec@siol.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1423 Lines: 38 Allwinner SoCs have dw hdmi controller v1.32a which exhibits same magenta line issue as i.MX6Q and i.MX6DL. Enable workaround for it. Tests show that one iteration is enough. Signed-off-by: Jernej Skrabec --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index a38db40ce990..7ca14d7325b5 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -1634,9 +1634,10 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi) * then write one of the FC registers several times. * * The number of iterations matters and depends on the HDMI TX revision - * (and possibly on the platform). So far only i.MX6Q (v1.30a) and - * i.MX6DL (v1.31a) have been identified as needing the workaround, with - * 4 and 1 iterations respectively. + * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL + * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified + * as needing the workaround, with 4 iterations for v1.30a and 1 + * iteration for others. */ switch (hdmi->version) { @@ -1644,6 +1645,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi) count = 4; break; case 0x131a: + case 0x132a: count = 1; break; default: -- 2.15.1