From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Maxime Ripard <maxime@cerno.tech>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, Heiko Stuebner <heiko@sntech.de>,
linux-rockchip@lists.infradead.org,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
Sandy Huang <hjc@rock-chips.com>,
linux-arm-kernel@lists.infradead.org,
Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
Maxime Chevallier <maxime.chevallier@bootlin.com>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 09/12] drm/rockchip: lvds: Add PX30 support
Date: Mon, 16 Dec 2019 12:03:12 +0100 [thread overview]
Message-ID: <20191216120312.4aa478da@xps13> (raw)
In-Reply-To: <20191216105827.rxkfbwemkqw446jx@gilmour.lan>
Hi Maxime,
Maxime Ripard <maxime@cerno.tech> wrote on Mon, 16 Dec 2019 11:58:27
+0100:
> Hi,
>
> On Fri, Dec 13, 2019 at 07:10:48PM +0100, Miquel Raynal wrote:
> > +static int px30_lvds_grf_config(struct drm_encoder *encoder,
> > + struct drm_display_mode *mode)
> > +{
> > + struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
> > + u8 nhsync = !(mode->flags & DRM_MODE_FLAG_PHSYNC);
> > + u8 nvsync = !(mode->flags & DRM_MODE_FLAG_PVSYNC);
> > + u8 ndclk = !(mode->flags & DRM_MODE_FLAG_PCSYNC);
> > + int ret;
> > +
> > + if (lvds->output != DISPLAY_OUTPUT_LVDS) {
> > + DRM_DEV_ERROR(lvds->dev, "Unsupported display output %d\n",
> > + lvds->output);
> > + return -EINVAL;
> > + }
> > +
> > + if (nhsync ^ nvsync) {
> > + DRM_DEV_ERROR(lvds->dev, "Unsupported Hsync/Vsync polarity\n");
> > + return -EINVAL;
> > + }
> > +
> > + /* Set format */
> > + ret = regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
> > + PX30_LVDS_FORMAT(lvds->format),
> > + PX30_LVDS_FORMAT(lvds->format));
> > + if (ret)
> > + return ret;
> > +
> > + /* Control Hsync/Vsync polarity */
> > + ret = regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON0,
> > + PX30_LVDS_TIE_CLKS(1),
> > + PX30_LVDS_TIE_CLKS(1));
> > + if (ret)
> > + return ret;
> > +
> > + /* Set Hsync/Vsync polarity */
> > + ret = regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON0,
> > + PX30_LVDS_INVERT_CLKS(1),
> > + PX30_LVDS_INVERT_CLKS(nhsync));
> > + if (ret)
> > + return ret;
>
> I don't know the hardware but it seems pretty weird to me. hsync and
> vsync in LVDS are not clocks (or even signals), they're a bit in the
> payload. Is there any explanation in the datasheet (or even a
> datasheet in the first place)?
There is no explanation about this in the PX30 TRM part 1 (public). But
you are right the naming is weird. Could the "tie clocks" thing above
mean something to you/people knowing the LVDS world?
Cheers,
Miquèl
next prev parent reply other threads:[~2019-12-16 11:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 18:10 [PATCH 00/12] Add PX30 LVDS support Miquel Raynal
2019-12-13 18:10 ` [PATCH 01/12] dt-bindings: display: rockchip-lvds: Declare PX30 compatible Miquel Raynal
2019-12-19 23:47 ` Rob Herring
2019-12-13 18:10 ` [PATCH 02/12] dt-bindings: display: rockchip-lvds: Document PX30 PHY Miquel Raynal
2019-12-16 10:48 ` Maxime Ripard
2019-12-13 18:10 ` [PATCH 03/12] drm/rockchip: lvds: Fix indentation of a #define Miquel Raynal
2019-12-13 18:10 ` [PATCH 04/12] drm/rockchip: lvds: Harmonize function names Miquel Raynal
2019-12-13 18:10 ` [PATCH 05/12] drm/rockchip: lvds: Change platform data Miquel Raynal
2019-12-13 18:10 ` [PATCH 06/12] drm/rockchip: lvds: Create an RK3288 specific probe function Miquel Raynal
2019-12-13 18:10 ` [PATCH 07/12] drm/rockchip: lvds: Helpers should return decent values Miquel Raynal
2019-12-13 18:10 ` [PATCH 08/12] drm/rockchip: lvds: Pack functions together Miquel Raynal
2019-12-13 18:10 ` [PATCH 09/12] drm/rockchip: lvds: Add PX30 support Miquel Raynal
2019-12-16 10:58 ` Maxime Ripard
2019-12-16 11:03 ` Miquel Raynal [this message]
2019-12-16 11:14 ` Maxime Ripard
[not found] ` <64f6c582-8ffd-1082-f161-1e8c1a8dda44@rock-chips.com>
2019-12-18 6:26 ` sandy.huang
2019-12-16 12:00 ` [PATCH 09/12] drm/rockchip: lvds: Add PX30 support【请注意,邮件由linux-rockchip-bounces+andy.yan=rock-chips.com@lists.infradead.org代发】 Andy Yan
2019-12-16 12:10 ` Miquel Raynal
2019-12-13 18:10 ` [PATCH 10/12] arm64: dts: rockchip: Add PX30 CRTCs graph LVDS endpoints Miquel Raynal
2019-12-13 18:28 ` Heiko Stübner
2019-12-13 18:38 ` Miquel Raynal
2019-12-13 18:10 ` [PATCH 11/12] arm64: dts: rockchip: Add PX30 DSI DPHY Miquel Raynal
2019-12-13 18:10 ` [PATCH 12/12] arm64: dts: rockchip: Add PX30 LVDS Miquel Raynal
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