On Tue, Jan 22, 2013 at 04:36:25PM -0600, Rob Clark wrote:
> Add an output panel driver for LCD panels. Tested with LCD3 cape on
> beaglebone.
>
> v1: original
> v2: s/of_find_node_by_name()/of_get_child_by_name()/ from Pantelis
> Antoniou
> v3: add backlight support
> v4: rebase to latest of video timing helpers
>
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
So given that I'm utterly lacking clue about all things of (which seems to
be where all the magic in this patch lies) I'm just gonna ask a few funny
questions.
[cut]
> +static int panel_connector_get_modes(struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + struct panel_connector *panel_connector = to_panel_connector(connector);
> + struct display_timings *timings = panel_connector->mod->timings;
> + int i;
> +
> + for (i = 0; i < timings->num_timings; i++) {
> + struct drm_display_mode *mode = drm_mode_create(dev);
> + struct videomode vm;
> +
> + if (videomode_from_timing(timings, &vm, i))
> + break;
> +
> + drm_display_mode_from_videomode(&vm, mode);
Why do we need to jump through the intermediate videomode thing here? Is
that a deficiency of the of/videomode stuff?
[cut]
> + ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
> + ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
> + ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
> + ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
> + ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
> + ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
> + ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
> + ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
> + ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
Shouldn't these values all be documented somewhere in the devictree docs?
Or are they somewhat standardized?
> +
> + /* optional: */
> + info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
> + info->stn_565_mode = of_property_read_bool(info_np, "stn-565-mode");
> + info->mono_8bit_mode = of_property_read_bool(info_np, "mono-8bit-mode");
> + info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
> +
> + if (of_property_read_u32(info_np, "max-bpp", &info->max_bpp))
> + info->max_bpp = info->bpp;
> + if (of_property_read_u32(info_np, "min-bpp", &info->min_bpp))
> + info->min_bpp = info->bpp;
> +
> + if (ret) {
> + pr_err("%s: error reading panel-info properties\n", __func__);
> + kfree(info);
> + return NULL;
> + }
> +
> + return info;
> +}
> +
> +static struct of_device_id panel_of_match[];
> +
> +static int panel_probe(struct platform_device *pdev)
> +{
> + struct device_node *node = pdev->dev.of_node;
> + struct panel_module *panel_mod;
> + struct tilcdc_module *mod;
> + struct pinctrl *pinctrl;
> + int ret = -EINVAL;
> +
> +
> + /* bail out early if no DT data: */
> + if (!node) {
> + dev_err(&pdev->dev, "device-tree data is missing\n");
> + return -ENXIO;
> + }
> +
> + panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
> + if (!panel_mod)
> + return -ENOMEM;
> +
> + mod = &panel_mod->base;
> +
> + tilcdc_module_init(mod, "panel", &panel_module_ops);
> +
> + pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
> + if (IS_ERR(pinctrl))
> + dev_warn(&pdev->dev, "pins are not configured\n");
> +
> +
> + panel_mod->timings = of_get_display_timings(node);
> + if (!panel_mod->timings) {
> + dev_err(&pdev->dev, "could not get panel timings\n");
> + goto fail;
> + }
> +
> + panel_mod->info = of_get_panel_info(node);
> + if (!panel_mod->info) {
> + dev_err(&pdev->dev, "could not get panel info\n");
> + goto fail;
> + }
> +
> + panel_mod->backlight = of_find_backlight_by_node(node);
If this _really_ works that easily, I'll have of-envy for the rest of my
life :(
/me hates the real-world abomination called Intel backlight handling
Cheers, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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