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From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Tony Lindgren <tony@atomide.com>
Cc:     Sebastian Reichel <sre@kernel.org>, Pavel Machek <pavel@ucw.cz>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-omap@vger.kernel.org, nekit1000@gmail.com, mpartap@gmx.net,
        merlijn@wizzup.org
Subject: Re: omap4: support for manually updated display
Date:   Wed, 31 Oct 2018 15:10:00 +0200
Message-ID: <2348762.PvrRPAx0JW@avalon>
Organization: Ideas on Board Oy
In-Reply-To: <20181020003812.GE43338@atomide.com>
References: <20180830090456.GA17277@amd> <20181019225827.s76wapp3cxrmp5af@earth.universe> <20181020003812.GE43338@atomide.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Tony,

On Saturday, 20 October 2018 03:38:12 EET Tony Lindgren wrote:
> * Sebastian Reichel <sre@kernel.org> [181019 15:58]:
> > I uploaded my current status here. It's not based on the newest
> > -next, but contains the interesting patches from Laurent. Also
> > the last few patches are not yet cleaned up, sorry for the mess.
> 
> Way to go, thanks :) Here's a quick fix for issues with loading
> and unloading modules, seems like this should be fixed somewhere
> else though?

Thanks for the report, I'll have a look at this.

> 8< -----------------------
> Unload of hdmi:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000278
> (hdmi_runtime_resume [omapdss]) from [<c060d944>]
> (__rpm_callback+0x144/0x1d8) (__rpm_callback) from [<c060d9f8>]
> (rpm_callback+0x20/0x80)
> (rpm_callback) from [<c060d580>] (rpm_resume+0x60c/0x828)
> (rpm_resume) from [<c060d7e8>] (__pm_runtime_resume+0x4c/0x64)
> (__pm_runtime_resume) from [<c06027ac>]
> (device_release_driver_internal+0x130/0x234)
> (device_release_driver_internal) from [<c06028f4>]
> (driver_detach+0x38/0x6c) (driver_detach) from [<c0601658>]
> (bus_remove_driver+0x4c/0xa4)
> (bus_remove_driver) from [<c06041fc>]
> (platform_unregister_drivers+0x20/0x2c) (platform_unregister_drivers) from
> [<c01f0ef8>] (sys_delete_module+0x1c0/0x230) (sys_delete_module) from
> [<c0101000>] (ret_fast_syscall+0x0/0x28)
> 
> 
> Unload of dsi:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000278
> (dsi_runtime_resume [omapdss]) from [<c060d944>]
> (__rpm_callback+0x144/0x1d8) (__rpm_callback) from [<c060d9f8>]
> (rpm_callback+0x20/0x80)
> (rpm_callback) from [<c060d580>] (rpm_resume+0x60c/0x828)
> (rpm_resume) from [<c060d7e8>] (__pm_runtime_resume+0x4c/0x64)
> (__pm_runtime_resume) from [<c0602364>] (driver_probe_device+0x38/0x164)
> (driver_probe_device) from [<c0602574>] (__driver_attach+0xe4/0xe8)
> (__driver_attach) from [<c0600418>] (bus_for_each_dev+0x70/0xb4)
> (bus_for_each_dev) from [<c06015a8>] (bus_add_driver+0x198/0x1fc)
> (bus_add_driver) from [<c06032ec>] (driver_register+0x74/0x108)
> (driver_register) from [<c0102fe4>] (do_one_initcall+0x80/0x31c)
> (do_one_initcall) from [<c01f0fc4>] (do_init_module+0x5c/0x1f8)
> (do_init_module) from [<c01f2e0c>] (load_module+0x1360/0x16c0)
> (load_module) from [<c01f33d4>] (sys_finit_module+0xbc/0xdc)
> (sys_finit_module) from [<c0101000>] (ret_fast_syscall+0x0/0x28)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c
> b/drivers/gpu/drm/omapdrm/dss/dsi.c --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -5484,6 +5484,9 @@ static int dsi_runtime_resume(struct device *dev)
>  	struct dsi_data *dsi = dev_get_drvdata(dev);
>  	int r;
> 
> +	if (!dsi || !dsi->dss || !dsi->dss->dispc)
> +		return -ENODEV;
> +
>  	r = dispc_runtime_get(dsi->dss->dispc);
>  	if (r)
>  		return r;
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> b/drivers/gpu/drm/omapdrm/dss/hdmi4.c ---
> a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> @@ -847,6 +847,9 @@ static int hdmi_runtime_resume(struct device *dev)
>  	struct omap_hdmi *hdmi = dev_get_drvdata(dev);
>  	int r;
> 
> +	if (!hdmi || !hdmi->dss || !hdmi->dss->dispc)
> +		return -ENODEV;
> +
>  	r = dispc_runtime_get(hdmi->dss->dispc);
>  	if (r < 0)
>  		return r;

-- 
Regards,

Laurent Pinchart