I have tested it with
X.Org X Server 1.12.4
Release Date: 2012-08-27
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-4-mx5 armv7l Debian
(coming from Debian Wheezy) on:
* gta04 (SPI panel)
* openpandora (SPI panel)
* BeagleBoard XM (with RGB panel)
* PandaBoard ES (w/o panel)
* omap5432-evm + Pyra prototype (MIPI panel)
Without this patch, X Server simply fails with:
Fatal server error:
no screens found
So please add
Tested-by: Nikolaus Schaller <h...@goldelico.com>
Thanks,
Nikolaus
Am 24.02.2015 um 10:37 schrieb NeilBrown <ne...@suse.de>:
>
>
> commit 303e4697e762dc92a40405f4e4b8aac02cd0d70b
> OMAPDSS: rename display-sysfs 'name' entry
>
> broke the xorg X server on my device as it couldn't find the display
> any more. It needs the 'name' file and now there isn't one.
>
> That commit claims that 'name' is not compatible with i2c or spi.
> i2c does register it own 'name' file, but spi does not, hence my
> problem - I have an spi display.
>
> So create a special case for i2c: add the name attribute for non-i2c
> devices.
>
> Fixes: 303e4697e762dc92a40405f4e4b8aac02cd0d70b
> Signed-off-by: NeilBrown <ne...@suse.de>
>
> --
>
> Hi Tomi,
> I wonder if you would consider this for the next merge window (or maybe even
> sooner as a bug-fix).
> I haven't tested it with an i2c display, but it certainly allows xorg to work
> on my spi-attached display.
>
> Thanks,
> NeilBrown
>
>
> diff --git a/drivers/video/fbdev/omap2/dss/display-sysfs.c
> b/drivers/video/fbdev/omap2/dss/display-sysfs.c
> index 5a2095a98ed8..53897b743130 100644
> --- a/drivers/video/fbdev/omap2/dss/display-sysfs.c
> +++ b/drivers/video/fbdev/omap2/dss/display-sysfs.c
> @@ -25,6 +25,15 @@
> #include <linux/platform_device.h>
> #include <linux/sysfs.h>
>
> +#if IS_ENABLED(CONFIG_I2C)
> +#include <linux/i2c.h>
> +#else
> +static inline int i2c_verify_client(struct device *dev)
> +{
> + return NULL;
> +}
> +#endif
> +
> #include <video/omapdss.h>
> #include "dss.h"
>
> @@ -278,6 +287,7 @@ static ssize_t display_wss_store(struct device *dev,
> }
>
> static DEVICE_ATTR(display_name, S_IRUGO, display_name_show, NULL);
> +static DEVICE_ATTR(name, S_IRUGO, display_name_show, NULL);
> static DEVICE_ATTR(enabled, S_IRUGO|S_IWUSR,
> display_enabled_show, display_enabled_store);
> static DEVICE_ATTR(tear_elim, S_IRUGO|S_IWUSR,
> @@ -315,6 +325,17 @@ int display_init_sysfs(struct platform_device *pdev)
> DSSERR("failed to create sysfs files\n");
> goto err;
> }
> + if (!i2c_verify_client(dssdev->dev)) {
> + /*
> + * Add 'name' file - not compatible with i2c, but
> + * need by Xorg for other devices.
> + */
> + r = sysfs_create_file(kobj, &dev_attr_name.attr);
> + if (r) {
> + DSSERR("fail to create 'name' sysfs file\n");
> + goto err;
> + }
> + }
>
> r = sysfs_create_link(&pdev->dev.kobj, kobj, dssdev->alias);
> if (r) {
> @@ -341,5 +362,7 @@ void display_uninit_sysfs(struct platform_device *pdev)
> sysfs_remove_link(&pdev->dev.kobj, dssdev->alias);
> sysfs_remove_files(&dssdev->dev->kobj,
> display_sysfs_attrs);
> + sysfs_remove_file(&dssdev->dev->kobj,
> + &dev_attr_name.attr);
> }
> }
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