From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chen-Yu Tsai Subject: [PATCH v2 03/13] drm/sun4i: tcon: Add support for demuxing TCON output on A31 Date: Tue, 26 Sep 2017 14:59:09 +0800 Message-ID: <20170926065919.24446-4-wens@csie.org> References: <20170926065919.24446-1-wens@csie.org> Reply-To: wens-jdAy2FN1RRM@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org In-Reply-To: <20170926065919.24446-1-wens-jdAy2FN1RRM@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Mark Brown , Maxime Ripard , David Airlie , Michael Turquette , Stephen Boyd , Rob Herring , Mark Rutland Cc: Chen-Yu Tsai , dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Id: devicetree@vger.kernel.org On systems with 2 TCONs such as the A31, it is possible to demux the output of the TCONs to one encoder. Add support for this for the A31. Signed-off-by: Chen-Yu Tsai --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 61 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index e853dfe51389..770b843a6fa9 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -14,9 +14,12 @@ #include #include #include +#include #include #include +#include + #include #include #include @@ -109,11 +112,69 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable) } EXPORT_SYMBOL(sun4i_tcon_enable_vblank); +static struct sun4i_tcon *sun4i_get_first_tcon(struct drm_device *drm) +{ + struct sun4i_drv *drv = drm->dev_private; + struct sun4i_tcon *tcon; + + list_for_each_entry(tcon, &drv->tcon_list, list) + if (tcon->id == 0) + return tcon; + + dev_warn(drm->dev, + "TCON0 not found, display output muxing may not work\n"); + + return tcon; +} + +static int _sun6i_tcon_set_mux(struct drm_encoder *encoder) +{ + struct sun4i_tcon *tcon = sun4i_get_first_tcon(encoder->dev); + int tcon_id = drm_crtc_to_sun4i_crtc(encoder->crtc)->tcon->id; + u32 shift; + + DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s (TCON %d)\n", + encoder->name, encoder->crtc->name, tcon_id); + + /* Only 2 TCONs */ + if (tcon_id >= 2) + return -EINVAL; + + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_TMDS: + /* HDMI */ + shift = 8; + break; + case DRM_MODE_ENCODER_DSI: + /* No MIPI DSI on A31s */ + if (of_device_is_compatible(tcon->dev->of_node, + "allwinner,sun6i-a31s-tcon")) + return -EINVAL; + shift = 0; + break; + default: + return -EINVAL; + } + + regmap_update_bits(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, + 0x3 << shift, tcon_id << shift); + + return 0; +} + void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel, struct drm_encoder *encoder) { + /* Get the device node of the display engine */ + struct device_node *node = encoder->dev->dev->of_node; u32 val; + if (of_device_is_compatible(node, "allwinner,sun6i-a31-display-engine") || + of_device_is_compatible(node, "allwinner,sun6i-a31s-display-engine")) { + _sun6i_tcon_set_mux(encoder); + return; + } + if (!tcon->quirks->has_unknown_mux) return; -- 2.14.1