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Date:   Tue, 10 Dec 2019 23:12:36 +0100
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Mihail Atanassov <Mihail.Atanassov@arm.com>
Cc:     Daniel Vetter <daniel@ffwll.ch>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Jonas Karlman <jonas@kwiboo.se>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Neil Armstrong <narmstrong@baylibre.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        nd <nd@arm.com>
Subject: Re: [PATCH] drm: Rename drm_bridge->dev to drm
Message-ID: <20191210221236.GX624164@phenom.ffwll.local>
Mail-Followup-To: Mihail Atanassov <Mihail.Atanassov@arm.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Jonas Karlman <jonas@kwiboo.se>, David Airlie <airlied@linux.ie>,
        Neil Armstrong <narmstrong@baylibre.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        nd <nd@arm.com>
References: <20191205163028.19941-1-mihail.atanassov@arm.com>
 <55bdd2ef-1033-9ae4-f033-bf6c3984cc95@suse.de>
 <20191210101250.GQ624164@phenom.ffwll.local>
 <1934781.Wy2AY364az@e123338-lin>
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In-Reply-To: <1934781.Wy2AY364az@e123338-lin>
User-Agent: Mutt/1.12.2 (2019-09-21)
Sender: linux-kernel-owner@vger.kernel.org
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On Tue, Dec 10, 2019 at 01:28:42PM +0000, Mihail Atanassov wrote:
> On Tuesday, 10 December 2019 10:12:50 GMT Daniel Vetter wrote:
> > On Fri, Dec 06, 2019 at 12:59:04PM +0100, Thomas Zimmermann wrote:
> > > Hi
> > > 
> > > Am 06.12.19 um 12:25 schrieb Mihail Atanassov:
> > > > Hallo Thomas,
> > > > 
> > > > On Thursday, 5 December 2019 18:20:06 GMT Thomas Zimmermann wrote:
> > > >> Hi
> > > >>
> > > >> Am 05.12.19 um 17:30 schrieb Mihail Atanassov:
> > > >>> The 'dev' name causes some confusion with 'struct device' [1][2], so use
> > > >>> 'drm' instead since this seems to be the prevalent name for 'struct
> > > >>> drm_device' members.
> > > >>>
> > > >>> [1] https://patchwork.freedesktop.org/patch/342472/?series=70039&rev=1
> > > >>> [2] https://patchwork.freedesktop.org/patch/343643/?series=70432&rev=1
> > > >>
> > > >> I read through the provided links, but can't see why is it called 'drm'.
> > > >> That sounds like a reference to a DRM driver structure to me.
> > > > 
> > > > There are about 550 hits on 'struct drm_device *drm', so I gathered that
> > > > it's the most common alternative to just naming it 'dev' (at about 4.5k
> > > > hits in the codebase). There's also 'ddev', 'drm_dev', 'drmdev' with
> > > > few hits.
> > > > 
> > > >>
> > > >> What about attached_dev or consumer_dev or encoder_dev?
> > > > 
> > > > Those would be more descriptive, if you think it's worth sidestepping
> > > > the above convention a bit. I don't mind either way.
> > > 
> > > Well, I don't have a say on these things, but it's worth considering a
> > > more descriptive name IMHO.
> > > 
> > > I also wonder why that field is there in the first place. Invoking
> > > drm_bridge_attach() sets the encoder and its dev field for the bridge.
> > > [1] Could the dev field be removed and all users refer to encoder->dev
> > > instead? If so, it seems like the better way to go.
> > 
> > That sounds like a pretty neat idea (if possible) ...
> > -Daniel
> > 
> 
> OK, I'll poke at it a bit and see what falls out. I'm guessing we don't
> particularly care about the extra pointer being dereferenced in driver code?
> The vast majority of the uses are in attach/detach logic so fairly benign but
> we do have a few in IRQs.

Modeset code is "readability over speed, any time" except if someone can
show in a real world use case that it actually matters somewhere. Spoiler:
In 10 years it never did. So go ahead without concerns, we have a lot more
pointer chasing going on here than just that :-)
-Daniel

> 
> > > 
> > > Best regards
> > > Thomas
> > > 
> > > [1]
> > > https://elixir.bootlin.com/linux/v5.4.2/source/drivers/gpu/drm/drm_bridge.c#L128
> > > 
> > > > 
> > > >>
> > > >> Best regards
> > > >> Thomas
> > > >>
> > > >>>
> > > >>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > > >>> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > > >>> Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
> > > >>> ---
> > > >>>  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c         |  2 +-
> > > >>>  drivers/gpu/drm/bridge/analogix/analogix-anx6345.c   |  2 +-
> > > >>>  drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c   |  2 +-
> > > >>>  drivers/gpu/drm/bridge/cdns-dsi.c                    |  2 +-
> > > >>>  drivers/gpu/drm/bridge/dumb-vga-dac.c                |  2 +-
> > > >>>  .../gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c |  2 +-
> > > >>>  drivers/gpu/drm/bridge/nxp-ptn3460.c                 |  2 +-
> > > >>>  drivers/gpu/drm/bridge/panel.c                       |  2 +-
> > > >>>  drivers/gpu/drm/bridge/parade-ps8622.c               |  2 +-
> > > >>>  drivers/gpu/drm/bridge/sii902x.c                     |  6 +++---
> > > >>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c            |  6 +++---
> > > >>>  drivers/gpu/drm/bridge/tc358764.c                    |  4 ++--
> > > >>>  drivers/gpu/drm/bridge/tc358767.c                    |  6 +++---
> > > >>>  drivers/gpu/drm/bridge/ti-sn65dsi86.c                |  2 +-
> > > >>>  drivers/gpu/drm/bridge/ti-tfp410.c                   |  6 +++---
> > > >>>  drivers/gpu/drm/drm_bridge.c                         | 12 ++++++------
> > > >>>  drivers/gpu/drm/i2c/tda998x_drv.c                    |  2 +-
> > > >>>  drivers/gpu/drm/mcde/mcde_dsi.c                      |  2 +-
> > > >>>  drivers/gpu/drm/msm/edp/edp_bridge.c                 |  2 +-
> > > >>>  drivers/gpu/drm/msm/hdmi/hdmi_bridge.c               |  4 ++--
> > > >>>  drivers/gpu/drm/rcar-du/rcar_lvds.c                  |  2 +-
> > > >>>  include/drm/drm_bridge.h                             |  4 ++--
> > > >>>  22 files changed, 38 insertions(+), 38 deletions(-)
> > > >>>
> > > >>> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > > >>> index 9e13e466e72c..db7d01cb0923 100644
> > > >>> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > > >>> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > > >>> @@ -863,7 +863,7 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge)
> > > >>>  		adv->connector.polled = DRM_CONNECTOR_POLL_CONNECT |
> > > >>>  				DRM_CONNECTOR_POLL_DISCONNECT;
> > > >>>  
> > > >>> -	ret = drm_connector_init(bridge->dev, &adv->connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, &adv->connector,
> > > >>>  				 &adv7511_connector_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_HDMIA);
> > > >>>  	if (ret) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> > > >>> index b4f3a923a52a..0e3508aeaa6c 100644
> > > >>> --- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> > > >>> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> > > >>> @@ -541,7 +541,7 @@ static int anx6345_bridge_attach(struct drm_bridge *bridge)
> > > >>>  		return err;
> > > >>>  	}
> > > >>>  
> > > >>> -	err = drm_connector_init(bridge->dev, &anx6345->connector,
> > > >>> +	err = drm_connector_init(bridge->drm, &anx6345->connector,
> > > >>>  				 &anx6345_connector_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_eDP);
> > > >>>  	if (err) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> > > >>> index 41867be03751..d5722bc28933 100644
> > > >>> --- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> > > >>> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> > > >>> @@ -908,7 +908,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge)
> > > >>>  		return err;
> > > >>>  	}
> > > >>>  
> > > >>> -	err = drm_connector_init(bridge->dev, &anx78xx->connector,
> > > >>> +	err = drm_connector_init(bridge->drm, &anx78xx->connector,
> > > >>>  				 &anx78xx_connector_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_DisplayPort);
> > > >>>  	if (err) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
> > > >>> index 3a5bd4e7fd1e..f6d7e97de66e 100644
> > > >>> --- a/drivers/gpu/drm/bridge/cdns-dsi.c
> > > >>> +++ b/drivers/gpu/drm/bridge/cdns-dsi.c
> > > >>> @@ -651,7 +651,7 @@ static int cdns_dsi_bridge_attach(struct drm_bridge *bridge)
> > > >>>  	struct cdns_dsi *dsi = input_to_dsi(input);
> > > >>>  	struct cdns_dsi_output *output = &dsi->output;
> > > >>>  
> > > >>> -	if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
> > > >>> +	if (!drm_core_check_feature(bridge->drm, DRIVER_ATOMIC)) {
> > > >>>  		dev_err(dsi->base.dev,
> > > >>>  			"cdns-dsi driver is only compatible with DRM devices supporting atomic updates");
> > > >>>  		return -ENOTSUPP;
> > > >>> diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > > >>> index cc33dc411b9e..30b5e54df381 100644
> > > >>> --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > > >>> +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> > > >>> @@ -112,7 +112,7 @@ static int dumb_vga_attach(struct drm_bridge *bridge)
> > > >>>  
> > > >>>  	drm_connector_helper_add(&vga->connector,
> > > >>>  				 &dumb_vga_con_helper_funcs);
> > > >>> -	ret = drm_connector_init_with_ddc(bridge->dev, &vga->connector,
> > > >>> +	ret = drm_connector_init_with_ddc(bridge->drm, &vga->connector,
> > > >>>  					  &dumb_vga_con_funcs,
> > > >>>  					  DRM_MODE_CONNECTOR_VGA,
> > > >>>  					  vga->ddc);
> > > >>> diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> > > >>> index e8a49f6146c6..ab06394cfff7 100644
> > > >>> --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> > > >>> +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> > > >>> @@ -223,7 +223,7 @@ static int ge_b850v3_lvds_attach(struct drm_bridge *bridge)
> > > >>>  	drm_connector_helper_add(connector,
> > > >>>  				 &ge_b850v3_lvds_connector_helper_funcs);
> > > >>>  
> > > >>> -	ret = drm_connector_init(bridge->dev, connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, connector,
> > > >>>  				 &ge_b850v3_lvds_connector_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_DisplayPort);
> > > >>>  	if (ret) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> > > >>> index 57ff01339559..714cb954522a 100644
> > > >>> --- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
> > > >>> +++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> > > >>> @@ -247,7 +247,7 @@ static int ptn3460_bridge_attach(struct drm_bridge *bridge)
> > > >>>  	}
> > > >>>  
> > > >>>  	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
> > > >>> -	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, &ptn_bridge->connector,
> > > >>>  			&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
> > > >>>  	if (ret) {
> > > >>>  		DRM_ERROR("Failed to initialize connector with drm\n");
> > > >>> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> > > >>> index f4e293e7cf64..7ed3b3e85f03 100644
> > > >>> --- a/drivers/gpu/drm/bridge/panel.c
> > > >>> +++ b/drivers/gpu/drm/bridge/panel.c
> > > >>> @@ -67,7 +67,7 @@ static int panel_bridge_attach(struct drm_bridge *bridge)
> > > >>>  	drm_connector_helper_add(connector,
> > > >>>  				 &panel_bridge_connector_helper_funcs);
> > > >>>  
> > > >>> -	ret = drm_connector_init(bridge->dev, connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, connector,
> > > >>>  				 &panel_bridge_connector_funcs,
> > > >>>  				 panel_bridge->connector_type);
> > > >>>  	if (ret) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
> > > >>> index b7a72dfdcac3..18cc693734b3 100644
> > > >>> --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> > > >>> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> > > >>> @@ -487,7 +487,7 @@ static int ps8622_attach(struct drm_bridge *bridge)
> > > >>>  	}
> > > >>>  
> > > >>>  	ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
> > > >>> -	ret = drm_connector_init(bridge->dev, &ps8622->connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, &ps8622->connector,
> > > >>>  			&ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
> > > >>>  	if (ret) {
> > > >>>  		DRM_ERROR("Failed to initialize connector with drm\n");
> > > >>> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> > > >>> index b70e8c5cf2e1..3d8b3e1eb0aa 100644
> > > >>> --- a/drivers/gpu/drm/bridge/sii902x.c
> > > >>> +++ b/drivers/gpu/drm/bridge/sii902x.c
> > > >>> @@ -402,7 +402,7 @@ static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
> > > >>>  static int sii902x_bridge_attach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	struct sii902x *sii902x = bridge_to_sii902x(bridge);
> > > >>> -	struct drm_device *drm = bridge->dev;
> > > >>> +	struct drm_device *drm = bridge->drm;
> > > >>>  	int ret;
> > > >>>  
> > > >>>  	drm_connector_helper_add(&sii902x->connector,
> > > >>> @@ -820,8 +820,8 @@ static irqreturn_t sii902x_interrupt(int irq, void *data)
> > > >>>  
> > > >>>  	mutex_unlock(&sii902x->mutex);
> > > >>>  
> > > >>> -	if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
> > > >>> -		drm_helper_hpd_irq_event(sii902x->bridge.dev);
> > > >>> +	if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.drm)
> > > >>> +		drm_helper_hpd_irq_event(sii902x->bridge.drm);
> > > >>>  
> > > >>>  	return IRQ_HANDLED;
> > > >>>  }
> > > >>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > > >>> index dbe38a54870b..7a549cce8536 100644
> > > >>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > > >>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > > >>> @@ -2346,7 +2346,7 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
> > > >>>  
> > > >>>  	drm_connector_helper_add(connector, &dw_hdmi_connector_helper_funcs);
> > > >>>  
> > > >>> -	drm_connector_init_with_ddc(bridge->dev, connector,
> > > >>> +	drm_connector_init_with_ddc(bridge->drm, connector,
> > > >>>  				    &dw_hdmi_connector_funcs,
> > > >>>  				    DRM_MODE_CONNECTOR_HDMIA,
> > > >>>  				    hdmi->ddc);
> > > >>> @@ -2554,8 +2554,8 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
> > > >>>  	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
> > > >>>  		dev_dbg(hdmi->dev, "EVENT=%s\n",
> > > >>>  			phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
> > > >>> -		if (hdmi->bridge.dev)
> > > >>> -			drm_helper_hpd_irq_event(hdmi->bridge.dev);
> > > >>> +		if (hdmi->bridge.drm)
> > > >>> +			drm_helper_hpd_irq_event(hdmi->bridge.drm);
> > > >>>  	}
> > > >>>  
> > > >>>  	hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0);
> > > >>> diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c
> > > >>> index db298f550a5a..1744d7daa534 100644
> > > >>> --- a/drivers/gpu/drm/bridge/tc358764.c
> > > >>> +++ b/drivers/gpu/drm/bridge/tc358764.c
> > > >>> @@ -352,7 +352,7 @@ static void tc358764_enable(struct drm_bridge *bridge)
> > > >>>  static int tc358764_attach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	struct tc358764 *ctx = bridge_to_tc358764(bridge);
> > > >>> -	struct drm_device *drm = bridge->dev;
> > > >>> +	struct drm_device *drm = bridge->drm;
> > > >>>  	int ret;
> > > >>>  
> > > >>>  	ctx->connector.polled = DRM_CONNECTOR_POLL_HPD;
> > > >>> @@ -378,7 +378,7 @@ static int tc358764_attach(struct drm_bridge *bridge)
> > > >>>  static void tc358764_detach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	struct tc358764 *ctx = bridge_to_tc358764(bridge);
> > > >>> -	struct drm_device *drm = bridge->dev;
> > > >>> +	struct drm_device *drm = bridge->drm;
> > > >>>  
> > > >>>  	drm_connector_unregister(&ctx->connector);
> > > >>>  	drm_fb_helper_remove_one_connector(drm->fb_helper, &ctx->connector);
> > > >>> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> > > >>> index 8029478ffebb..fccacd12bb53 100644
> > > >>> --- a/drivers/gpu/drm/bridge/tc358767.c
> > > >>> +++ b/drivers/gpu/drm/bridge/tc358767.c
> > > >>> @@ -1407,7 +1407,7 @@ static int tc_bridge_attach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
> > > >>>  	struct tc_data *tc = bridge_to_tc(bridge);
> > > >>> -	struct drm_device *drm = bridge->dev;
> > > >>> +	struct drm_device *drm = bridge->drm;
> > > >>>  	int ret;
> > > >>>  
> > > >>>  	/* Create DP/eDP connector */
> > > >>> @@ -1514,7 +1514,7 @@ static irqreturn_t tc_irq_handler(int irq, void *arg)
> > > >>>  		dev_err(tc->dev, "syserr %x\n", stat);
> > > >>>  	}
> > > >>>  
> > > >>> -	if (tc->hpd_pin >= 0 && tc->bridge.dev) {
> > > >>> +	if (tc->hpd_pin >= 0 && tc->bridge.drm) {
> > > >>>  		/*
> > > >>>  		 * H is triggered when the GPIO goes high.
> > > >>>  		 *
> > > >>> @@ -1528,7 +1528,7 @@ static irqreturn_t tc_irq_handler(int irq, void *arg)
> > > >>>  			h ? "H" : "", lc ? "LC" : "");
> > > >>>  
> > > >>>  		if (h || lc)
> > > >>> -			drm_kms_helper_hotplug_event(tc->bridge.dev);
> > > >>> +			drm_kms_helper_hotplug_event(tc->bridge.drm);
> > > >>>  	}
> > > >>>  
> > > >>>  	regmap_write(tc->regmap, INTSTS_G, val);
> > > >>> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > >>> index 43abf01ebd4c..23576c3fac9f 100644
> > > >>> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > >>> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > >>> @@ -275,7 +275,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge)
> > > >>>  						   .node = NULL,
> > > >>>  						 };
> > > >>>  
> > > >>> -	ret = drm_connector_init(bridge->dev, &pdata->connector,
> > > >>> +	ret = drm_connector_init(bridge->drm, &pdata->connector,
> > > >>>  				 &ti_sn_bridge_connector_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_eDP);
> > > >>>  	if (ret) {
> > > >>> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
> > > >>> index aa3198dc9903..cae9fd584ff1 100644
> > > >>> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
> > > >>> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
> > > >>> @@ -135,7 +135,7 @@ static int tfp410_attach(struct drm_bridge *bridge)
> > > >>>  
> > > >>>  	drm_connector_helper_add(&dvi->connector,
> > > >>>  				 &tfp410_con_helper_funcs);
> > > >>> -	ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector,
> > > >>> +	ret = drm_connector_init_with_ddc(bridge->drm, &dvi->connector,
> > > >>>  					  &tfp410_con_funcs,
> > > >>>  					  dvi->connector_type,
> > > >>>  					  dvi->ddc);
> > > >>> @@ -179,8 +179,8 @@ static void tfp410_hpd_work_func(struct work_struct *work)
> > > >>>  
> > > >>>  	dvi = container_of(work, struct tfp410, hpd_work.work);
> > > >>>  
> > > >>> -	if (dvi->bridge.dev)
> > > >>> -		drm_helper_hpd_irq_event(dvi->bridge.dev);
> > > >>> +	if (dvi->bridge.drm)
> > > >>> +		drm_helper_hpd_irq_event(dvi->bridge.drm);
> > > >>>  }
> > > >>>  
> > > >>>  static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
> > > >>> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> > > >>> index cba537c99e43..80f7a1aa969e 100644
> > > >>> --- a/drivers/gpu/drm/drm_bridge.c
> > > >>> +++ b/drivers/gpu/drm/drm_bridge.c
> > > >>> @@ -119,19 +119,19 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
> > > >>>  	if (!encoder || !bridge)
> > > >>>  		return -EINVAL;
> > > >>>  
> > > >>> -	if (previous && (!previous->dev || previous->encoder != encoder))
> > > >>> +	if (previous && (!previous->drm || previous->encoder != encoder))
> > > >>>  		return -EINVAL;
> > > >>>  
> > > >>> -	if (bridge->dev)
> > > >>> +	if (bridge->drm)
> > > >>>  		return -EBUSY;
> > > >>>  
> > > >>> -	bridge->dev = encoder->dev;
> > > >>> +	bridge->drm = encoder->dev;
> > > >>>  	bridge->encoder = encoder;
> > > >>>  
> > > >>>  	if (bridge->funcs->attach) {
> > > >>>  		ret = bridge->funcs->attach(bridge);
> > > >>>  		if (ret < 0) {
> > > >>> -			bridge->dev = NULL;
> > > >>> +			bridge->drm = NULL;
> > > >>>  			bridge->encoder = NULL;
> > > >>>  			return ret;
> > > >>>  		}
> > > >>> @@ -151,13 +151,13 @@ void drm_bridge_detach(struct drm_bridge *bridge)
> > > >>>  	if (WARN_ON(!bridge))
> > > >>>  		return;
> > > >>>  
> > > >>> -	if (WARN_ON(!bridge->dev))
> > > >>> +	if (WARN_ON(!bridge->drm))
> > > >>>  		return;
> > > >>>  
> > > >>>  	if (bridge->funcs->detach)
> > > >>>  		bridge->funcs->detach(bridge);
> > > >>>  
> > > >>> -	bridge->dev = NULL;
> > > >>> +	bridge->drm = NULL;
> > > >>>  }
> > > >>>  
> > > >>>  /**
> > > >>> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> > > >>> index a63790d32d75..fa430e43f5ad 100644
> > > >>> --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> > > >>> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> > > >>> @@ -1360,7 +1360,7 @@ static int tda998x_bridge_attach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);
> > > >>>  
> > > >>> -	return tda998x_connector_init(priv, bridge->dev);
> > > >>> +	return tda998x_connector_init(priv, bridge->drm);
> > > >>>  }
> > > >>>  
> > > >>>  static void tda998x_bridge_detach(struct drm_bridge *bridge)
> > > >>> diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
> > > >>> index 42fff811653e..4ef14d5cdcb6 100644
> > > >>> --- a/drivers/gpu/drm/mcde/mcde_dsi.c
> > > >>> +++ b/drivers/gpu/drm/mcde/mcde_dsi.c
> > > >>> @@ -846,7 +846,7 @@ static void mcde_dsi_bridge_disable(struct drm_bridge *bridge)
> > > >>>  static int mcde_dsi_bridge_attach(struct drm_bridge *bridge)
> > > >>>  {
> > > >>>  	struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
> > > >>> -	struct drm_device *drm = bridge->dev;
> > > >>> +	struct drm_device *drm = bridge->drm;
> > > >>>  	int ret;
> > > >>>  
> > > >>>  	if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
> > > >>> diff --git a/drivers/gpu/drm/msm/edp/edp_bridge.c b/drivers/gpu/drm/msm/edp/edp_bridge.c
> > > >>> index 2950bba4aca9..a329c7a79d8d 100644
> > > >>> --- a/drivers/gpu/drm/msm/edp/edp_bridge.c
> > > >>> +++ b/drivers/gpu/drm/msm/edp/edp_bridge.c
> > > >>> @@ -47,7 +47,7 @@ static void edp_bridge_mode_set(struct drm_bridge *bridge,
> > > >>>  		const struct drm_display_mode *mode,
> > > >>>  		const struct drm_display_mode *adjusted_mode)
> > > >>>  {
> > > >>> -	struct drm_device *dev = bridge->dev;
> > > >>> +	struct drm_device *dev = bridge->drm;
> > > >>>  	struct drm_connector *connector;
> > > >>>  	struct edp_bridge *edp_bridge = to_edp_bridge(bridge);
> > > >>>  	struct msm_edp *edp = edp_bridge->edp;
> > > >>> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> > > >>> index ba81338a9bf8..0add3c88a13e 100644
> > > >>> --- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> > > >>> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> > > >>> @@ -20,7 +20,7 @@ void msm_hdmi_bridge_destroy(struct drm_bridge *bridge)
> > > >>>  
> > > >>>  static void msm_hdmi_power_on(struct drm_bridge *bridge)
> > > >>>  {
> > > >>> -	struct drm_device *dev = bridge->dev;
> > > >>> +	struct drm_device *dev = bridge->drm;
> > > >>>  	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
> > > >>>  	struct hdmi *hdmi = hdmi_bridge->hdmi;
> > > >>>  	const struct hdmi_platform_config *config = hdmi->config;
> > > >>> @@ -56,7 +56,7 @@ static void msm_hdmi_power_on(struct drm_bridge *bridge)
> > > >>>  
> > > >>>  static void power_off(struct drm_bridge *bridge)
> > > >>>  {
> > > >>> -	struct drm_device *dev = bridge->dev;
> > > >>> +	struct drm_device *dev = bridge->drm;
> > > >>>  	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
> > > >>>  	struct hdmi *hdmi = hdmi_bridge->hdmi;
> > > >>>  	const struct hdmi_platform_config *config = hdmi->config;
> > > >>> diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > > >>> index 8c6c172bbf2e..12fcfbf31968 100644
> > > >>> --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > > >>> +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > > >>> @@ -622,7 +622,7 @@ static int rcar_lvds_attach(struct drm_bridge *bridge)
> > > >>>  	if (!lvds->panel)
> > > >>>  		return 0;
> > > >>>  
> > > >>> -	ret = drm_connector_init(bridge->dev, connector, &rcar_lvds_conn_funcs,
> > > >>> +	ret = drm_connector_init(bridge->drm, connector, &rcar_lvds_conn_funcs,
> > > >>>  				 DRM_MODE_CONNECTOR_LVDS);
> > > >>>  	if (ret < 0)
> > > >>>  		return ret;
> > > >>> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> > > >>> index c0a2286a81e9..795860200ebf 100644
> > > >>> --- a/include/drm/drm_bridge.h
> > > >>> +++ b/include/drm/drm_bridge.h
> > > >>> @@ -376,8 +376,8 @@ struct drm_bridge_timings {
> > > >>>   * struct drm_bridge - central DRM bridge control structure
> > > >>>   */
> > > >>>  struct drm_bridge {
> > > >>> -	/** @dev: DRM device this bridge belongs to */
> > > >>> -	struct drm_device *dev;
> > > >>> +	/** @drm: DRM device this bridge belongs to */
> > > >>> +	struct drm_device *drm;
> > > >>>  	/** @encoder: encoder to which this bridge is connected */
> > > >>>  	struct drm_encoder *encoder;
> > > >>>  	/** @next: the next bridge in the encoder chain */
> > > >>>
> > > >>
> > > >>
> > > > 
> > > > 
> > > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> -- 
> Mihail
> 
> 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch