Re: omap4: support for manually updated display

Laurent Pinchart
2018-10-31T13:10:00Z

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

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