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drm/edid: add drm_edid_print_product_id()

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Add a function to print a decoded EDID vendor and product id to a drm
printer, optionally with the raw data.

v2:
- refactor date printing
- use seq_buf to avoid kasprintf() (Ville)
- handle week == 0 (Ville)
- use be16_to_cpu() on manufacturer_name

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Melissa Wen <mwen@igalia.com> # v1
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/32bbc83ee6557809ef6d7a5edb1bc8ef4d56d10f.1712655867.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Jani Nikula 2024-04-09 12:46:10 +03:00
parent 3ddbd34553
commit 3f56e5514b
2 changed files with 47 additions and 0 deletions
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44
drivers/gpu/drm/drm_edid.c
View File

@ -29,12 +29,14 @@
*/
#include <linux/bitfield.h>
#include <linux/byteorder/generic.h>
#include <linux/cec.h>
#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/seq_buf.h>
#include <linux/slab.h>
#include <linux/vga_switcheroo.h>
@ -2771,6 +2773,48 @@ void drm_edid_get_product_id(const struct drm_edid *drm_edid,
}
EXPORT_SYMBOL(drm_edid_get_product_id);
static void decode_date(struct seq_buf *s, const struct drm_edid_product_id *id)
{
int week = id->week_of_manufacture;
int year = id->year_of_manufacture + 1990;
if (week == 0xff)
seq_buf_printf(s, "model year: %d", year);
else if (!week)
seq_buf_printf(s, "year of manufacture: %d", year);
else
seq_buf_printf(s, "week/year of manufacture: %d/%d", week, year);
}
/**
* drm_edid_print_product_id - Print decoded product id to printer
* @p: drm printer
* @id: EDID product id
* @raw: If true, also print the raw hex
*
* See VESA E-EDID 1.4 section 3.4.
*/
void drm_edid_print_product_id(struct drm_printer *p,
const struct drm_edid_product_id *id, bool raw)
{
DECLARE_SEQ_BUF(date, 40);
char vend[4];
drm_edid_decode_mfg_id(be16_to_cpu(id->manufacturer_name), vend);
decode_date(&date, id);
drm_printf(p, "manufacturer name: %s, product code: %u, serial number: %u, %s\n",
vend, le16_to_cpu(id->product_code),
le32_to_cpu(id->serial_number), seq_buf_str(&date));
if (raw)
drm_printf(p, "raw product id: %*ph\n", (int)sizeof(*id), id);
WARN_ON(seq_buf_has_overflowed(&date));
}
EXPORT_SYMBOL(drm_edid_print_product_id);
/**
* drm_edid_get_panel_id - Get a panel's ID from EDID
* @drm_edid: EDID that contains panel ID.

3
include/drm/drm_edid.h
View File

@ -30,6 +30,7 @@ struct drm_connector;
struct drm_device;
struct drm_display_mode;
struct drm_edid;
struct drm_printer;
struct hdmi_avi_infoframe;
struct hdmi_vendor_infoframe;
struct i2c_adapter;
@ -481,6 +482,8 @@ int drm_edid_connector_add_modes(struct drm_connector *connector);
bool drm_edid_is_digital(const struct drm_edid *drm_edid);
void drm_edid_get_product_id(const struct drm_edid *drm_edid,
struct drm_edid_product_id *id);
void drm_edid_print_product_id(struct drm_printer *p,
const struct drm_edid_product_id *id, bool raw);
const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
int ext_id, int *ext_index);