On Wed, Nov 14, 2012 at 12:43:19PM +0100, Steffen Trumtrar wrote:
[...]
> +display-timings bindings
> +========================
> +
> +display timings node
I didn't express myself very clearly here =). The way I think this
should be written is "display-timings node".
> +required properties:
> + - hactive, vactive: Display resolution
> + - hfront-porch, hback-porch, hsync-len: Horizontal Display timing parameters
> + in pixels
> + vfront-porch, vback-porch, vsync-len: Vertical display timing parameters
> in
> + lines
> + - clock-frequency: displayclock in Hz
I still think "displayclock" should be two words: "display clock".
> +/**
> + * of_get_display_timings - parse all display_timing entries from a
> device_node
> + * @np: device_node with the subnodes
> + **/
> +struct display_timings *of_get_display_timings(struct device_node *np)
> +{
[...]
> + disp->num_timings = 0;
> + disp->native_mode = 0;
> +
> + for_each_child_of_node(timings_np, entry) {
> + struct display_timing *dt;
> +
> + dt = of_get_display_timing(entry);
> + if (!dt) {
> + /* to not encourage wrong devicetrees, fail in case of
> an error */
> + pr_err("%s: error in timing %d\n", __func__,
> disp->num_timings+1);
> + goto timingfail;
I believe you're still potentially leaking memory here. In case you have
5 entries for instance, and the last one fails to parse, then this will
cause the memory allocated for the 4 correct entries to be lost.
Can't you just call display_timings_release() in this case and then jump
to dispfail? That would still leak the native_mode device node. Maybe it
would be better to keep timingfail but modify it to free the display
timings with display_timings_release() instead? See below.
> + }
> +
> + if (native_mode == entry)
> + disp->native_mode = disp->num_timings;
> +
> + disp->timings[disp->num_timings] = dt;
> + disp->num_timings++;
> + }
> + of_node_put(timings_np);
> + of_node_put(native_mode);
> +
> + if (disp->num_timings > 0)
> + pr_info("%s: got %d timings. Using timing #%d as default\n",
> __func__,
> + disp->num_timings , disp->native_mode + 1);
> + else {
> + pr_err("%s: no valid timings specified\n", __func__);
> + display_timings_release(disp);
> + return NULL;
> + }
> + return disp;
> +
> +timingfail:
> + if (native_mode)
> + of_node_put(native_mode);
> + kfree(disp->timings);
Call display_timings_release(disp) instead of kfree(disp->timings)?
> diff --git a/include/linux/of_videomode.h b/include/linux/of_videomode.h
> new file mode 100644
> index 0000000..4138758
> --- /dev/null
> +++ b/include/linux/of_videomode.h
> @@ -0,0 +1,16 @@
> +/*
> + * Copyright 2012 Steffen Trumtrar <s.trumtrar at pengutronix.de>
> + *
> + * videomode of-helpers
> + *
> + * This file is released under the GPLv2
> + */
> +
> +#ifndef __LINUX_OF_VIDEOMODE_H
> +#define __LINUX_OF_VIDEOMODE_H
> +
> +#include <linux/videomode.h>
> +#include <linux/of.h>
> +
> +int of_get_videomode(struct device_node *np, struct videomode *vm, int
> index);
> +#endif /* __LINUX_OF_VIDEOMODE_H */
Nit: should have a blank line before #endif.
Thierry
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