From: Jernej Skrabec <jernej.skrabec@siol.net>
To: robh+dt@kernel.org, maxime.ripard@bootlin.com, wens@csie.org
Cc: mark.rutland@arm.com, mturquette@baylibre.com, sboyd@kernel.org,
airlied@linux.ie, architt@codeaurora.org, a.hajda@samsung.com,
jernej.skrabec@siol.net, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-sunxi@googlegroups.com
Subject: [PATCH 22/27] drm/sun4i: Initialize registers in tcon-top driver
Date: Sun, 2 Sep 2018 09:26:38 +0200 [thread overview]
Message-ID: <20180902072643.4917-23-jernej.skrabec@siol.net> (raw)
In-Reply-To: <20180902072643.4917-1-jernej.skrabec@siol.net>
It turns out that TCON TOP registers in H6 SoC have non-zero reset
value. This may cause issues if bits are not changed during
configuration.
To prevent that, initialize registers to 0.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
drivers/gpu/drm/sun4i/sun8i_tcon_top.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
index 3040a79f298f..37158548b447 100644
--- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
+++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
@@ -167,6 +167,13 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
goto err_assert_reset;
}
+ /*
+ * At least on H6, some registers have some bits set by default
+ * which may cause issues. Clear them here.
+ */
+ writel(0, regs + TCON_TOP_PORT_SEL_REG);
+ writel(0, regs + TCON_TOP_GATE_SRC_REG);
+
/*
* TCON TOP has two muxes, which select parent clock for each TCON TV
* channel clock. Parent could be either TCON TV or TVE clock. For now
--
2.18.0
next prev parent reply other threads:[~2018-09-02 7:28 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-02 7:26 [PATCH 00/27] Allwinner H6 DE3 and HDMI support Jernej Skrabec
2018-09-02 7:26 ` [PATCH 01/27] dt-bindings: sunxi-sram: add binding for Allwinner H6 SRAM C Jernej Skrabec
2018-09-04 8:39 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 02/27] arm64: allwinner: h6: add system controller device tree node Jernej Skrabec
2018-09-04 8:40 ` Chen-Yu Tsai
2018-09-04 8:44 ` [linux-sunxi] " Icenowy Zheng
2018-09-12 14:49 ` Chen-Yu Tsai
2018-09-12 15:37 ` Icenowy Zheng
2018-09-02 7:26 ` [PATCH 03/27] dt-bindings: bus: add H6 DE3 bus binding Jernej Skrabec
2018-09-02 7:26 ` [PATCH 04/27] clk: sunxi-ng: Adjust MP clock parent rate when allowed Jernej Skrabec
2018-09-02 7:26 ` [PATCH 05/27] clk: sunxi-ng: Use u64 for calculation of NM rate Jernej Skrabec
2018-09-04 9:18 ` Chen-Yu Tsai
2018-09-04 18:06 ` Jernej Škrabec
2018-09-02 7:26 ` [PATCH 06/27] clk: sunxi-ng: h6: Set video PLLs limits Jernej Skrabec
2018-09-04 15:49 ` kbuild test robot
2018-09-04 15:49 ` kbuild test robot
2018-09-02 7:26 ` [PATCH 07/27] dt-bindings: clock: sun8i-de2: Add H6 DE3 clock description Jernej Skrabec
2018-09-04 8:59 ` Chen-Yu Tsai
2018-09-04 9:05 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 08/27] clk: sunxi-ng: Add support for H6 DE3 clocks Jernej Skrabec
2018-09-04 9:04 ` Chen-Yu Tsai
2018-09-04 17:45 ` Jernej Škrabec
2018-09-12 12:20 ` Chen-Yu Tsai
2018-09-12 14:55 ` Jernej Škrabec
2018-09-12 16:16 ` [linux-sunxi] " Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 09/27] dt-bindings: display: sun4i-drm: Add H6 display engine compatibles Jernej Skrabec
[not found] ` <5b9f3f4d.1c69fb81.c776b.ee42@mx.google.com>
2018-09-22 13:32 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 10/27] drm/sun4i: Add compatible for H6 display engine Jernej Skrabec
2018-09-03 12:18 ` Maxime Ripard
2018-09-02 7:26 ` [PATCH 11/27] drm/sun4i: Rework DE2 register defines Jernej Skrabec
2018-09-22 12:32 ` [linux-sunxi] " Chen-Yu Tsai
2018-09-23 20:02 ` Jernej Škrabec
2018-09-24 2:01 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 12/27] drm/sun4i: Add basic support for DE3 Jernej Skrabec
2018-09-22 13:19 ` Chen-Yu Tsai
2018-09-23 19:51 ` Jernej Škrabec
2018-09-24 2:04 ` Chen-Yu Tsai
2018-10-05 17:51 ` Jernej Škrabec
2018-10-06 15:34 ` [linux-sunxi] " Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 13/27] drm/sun4i: Add support for H6 DE3 mixer 0 Jernej Skrabec
2018-09-22 13:23 ` Chen-Yu Tsai
2018-09-22 13:47 ` Chen-Yu Tsai
2018-09-23 19:40 ` [linux-sunxi] " Jernej Škrabec
2018-09-24 1:59 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 14/27] drm/bridge/synopsys: dw-hdmi: Enable workaround for v2.12a Jernej Skrabec
2018-09-22 13:54 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 15/27] drm/sun4i: Not all DW HDMI controllers has scrambled addresses Jernej Skrabec
2018-09-12 12:25 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 16/27] drm/sun4i: dw-hdmi: Make mode_valid function configurable Jernej Skrabec
2018-09-22 13:29 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 17/27] drm/sun4i: dw-hdmi: Add quirk for setting TMDS clock Jernej Skrabec
2018-09-22 13:30 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 18/27] dt-bindings: display: sunxi: add DT binding for Allwinner H6 DW HDMI Jernej Skrabec
2018-09-02 7:26 ` [PATCH 19/27] drm/sun4i: Add support for H6 DW HDMI controller Jernej Skrabec
2018-09-12 12:29 ` Chen-Yu Tsai
2018-09-02 7:26 ` [PATCH 20/27] drm/sun4i: Add support for Synopsys HDMI PHY Jernej Skrabec
2018-09-02 7:26 ` [PATCH 21/27] drm/sun4i: Add support for H6 " Jernej Skrabec
2018-09-22 15:55 ` Chen-Yu Tsai
2018-09-23 19:29 ` Jernej Škrabec
2018-09-02 7:26 ` Jernej Skrabec [this message]
2018-09-02 7:26 ` [PATCH 23/27] drm: sun4i: add quirks for TCON TOP Jernej Skrabec
2018-09-02 7:26 ` [PATCH 24/27] dt-bindings: display: sun4i-drm: document H6 " Jernej Skrabec
2018-09-02 7:26 ` [PATCH 25/27] drm: sun4i: add support for " Jernej Skrabec
2018-09-02 7:26 ` [PATCH 26/27] arm64: dts: sun50i: h6: Add HDMI pipeline Jernej Skrabec
2018-09-02 7:26 ` [PATCH 27/27] arm64: dts: sun50i: h6: Enable HDMI output on Pine H64 board Jernej Skrabec
2018-09-02 9:31 ` [PATCH 00/27] Allwinner H6 DE3 and HDMI support Chen-Yu Tsai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180902072643.4917-23-jernej.skrabec@siol.net \
--to=jernej.skrabec@siol.net \
--cc=a.hajda@samsung.com \
--cc=airlied@linux.ie \
--cc=architt@codeaurora.org \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sunxi@googlegroups.com \
--cc=mark.rutland@arm.com \
--cc=maxime.ripard@bootlin.com \
--cc=mturquette@baylibre.com \
--cc=robh+dt@kernel.org \
--cc=sboyd@kernel.org \
--cc=wens@csie.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).