lkml.org 
[lkml]   [2023]   [Jun]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2 3/3] drm/panel-simple: allow LVDS format override
From
Hi,

gentle ping here - Do you have any feedback for me on this patch?

Thanks and best regards
Johannes

On 5/23/23 10:19, Johannes Zink wrote:
> Some panels support multiple LVDS data mapping formats, which can be
> used e.g. run displays on jeida-18 format when only 3 LVDS lanes are
> available.
>
> Add parsing of an optional data-mapping devicetree property, which also
> touches up the bits per color to match the bus format.
>
> Signed-off-by: Johannes Zink <j.zink@pengutronix.de>
>
> ---
>
> Changes:
>
> v1 -> v2: - fix missing unwind goto found by test robot
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Link: https://lore.kernel.org/r/202304160359.4LHmFOlU-lkp@intel.com/
> ---
> drivers/gpu/drm/panel/panel-simple.c | 39 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 38 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 2a9c1a785a5c..0a35fdb49ccb 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -40,6 +40,7 @@
> #include <drm/drm_edid.h>
> #include <drm/drm_mipi_dsi.h>
> #include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>
> /**
> * struct panel_desc - Describes a simple panel.
> @@ -559,7 +560,7 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> struct device_node *ddc;
> int connector_type;
> u32 bus_flags;
> - int err;
> + int err, ret;
>
> panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
> if (!panel)
> @@ -605,6 +606,42 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
> panel_simple_parse_panel_timing_node(dev, panel, &dt);
> }
>
> +
> + /* optional data-mapping property for overriding bus format */
> + ret = drm_of_lvds_get_data_mapping(dev->of_node);
> + if (ret == -EINVAL) {
> + dev_warn(dev, "Ignore invalid data-mapping property");
> + } else if (ret != -ENODEV) {
> + int bpc;
> +
> + switch (ret) {
> + default:
> + WARN_ON(1);
> + fallthrough;
> + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
> + fallthrough;
> + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
> + bpc = 8;
> + break;
> + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
> + bpc = 6;
> + }
> +
> + if (desc->bpc != bpc || desc->bus_format != ret) {
> + struct panel_desc *override_desc;
> +
> + override_desc = devm_kmemdup(dev, desc, sizeof(*desc), GFP_KERNEL);
> + if (!override_desc) {
> + err = -ENOMEM;
> + goto free_ddc;
> + }
> +
> + override_desc->bus_format = ret;
> + override_desc->bpc = bpc;
> + panel->desc = override_desc;
> + }
> + }
> +
> connector_type = desc->connector_type;
> /* Catch common mistakes for panels. */
> switch (connector_type) {
>

--
Pengutronix e.K. | Johannes Zink |
Steuerwalder Str. 21 | https://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686| Fax: +49-5121-206917-5555 |

\
 
 \ /
  Last update: 2023-06-02 16:35    [W:0.118 / U:0.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site