diff options
| author | Julien Stephan <[email protected]> | 2025-06-30 12:08:16 +0200 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2025-12-30 11:22:57 -0600 |
| commit | 5e9b0b56ad8c2a4289b2b506ad3d0f3acd0d20ba (patch) | |
| tree | 6a39e7d920a1089506083bb62e794cceca259c66 /cmd | |
| parent | 5b2ee2c4a200961fa92ab1f2f2502ee41905257e (diff) | |
cmd: add new command to read edid
Add a new command to read EDID info from connected display.
When applicable EDID can also be retrieved by commands such as:
i2c dev x
i2c edid 0x50
but the new read_edid function relies on the implementation of the
read_edid callback from DISPLAY driver.
Signed-off-by: Julien Stephan <[email protected]>
Diffstat (limited to 'cmd')
| -rw-r--r-- | cmd/Kconfig | 6 | ||||
| -rw-r--r-- | cmd/Makefile | 1 | ||||
| -rw-r--r-- | cmd/read_edid.c | 38 |
3 files changed, 45 insertions, 0 deletions
diff --git a/cmd/Kconfig b/cmd/Kconfig index f21d27cb27f..3018e33ca7d 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1608,6 +1608,12 @@ config CMD_READ help Provides low-level access to the data in a partition. +config CMD_READ_EDID + bool "read_edid - Read display EDID" + depends on DISPLAY + help + Read and parse edid from connected display device. + config CMD_REMOTEPROC bool "remoteproc" depends on REMOTEPROC diff --git a/cmd/Makefile b/cmd/Makefile index 80cf70b7fe8..7cb379c05a0 100644 --- a/cmd/Makefile +++ b/cmd/Makefile @@ -154,6 +154,7 @@ obj-$(CONFIG_CMD_WOL) += wol.o obj-$(CONFIG_CMD_QFW) += qfw.o obj-$(CONFIG_CMD_READ) += read.o obj-$(CONFIG_CMD_WRITE) += read.o +obj-$(CONFIG_CMD_READ_EDID) += read_edid.o obj-$(CONFIG_CMD_REGINFO) += reginfo.o obj-$(CONFIG_CMD_REMOTEPROC) += remoteproc.o obj-$(CONFIG_CMD_RNG) += rng.o diff --git a/cmd/read_edid.c b/cmd/read_edid.c new file mode 100644 index 00000000000..428dddca8bb --- /dev/null +++ b/cmd/read_edid.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2025 BayLibre, SAS + */ + +#include <command.h> +#include <dm.h> +#include <display.h> +#include <edid.h> + +static int do_read_edid(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]) +{ + struct udevice *dev; + int ret; + u8 edid[EDID_EXT_SIZE]; + + /* Get the first display device (UCLASS_DISPLAY) */ + ret = uclass_first_device_err(UCLASS_DISPLAY, &dev); + if (ret) { + printf("Cannot get display device: %d\n", ret); + return CMD_RET_FAILURE; + } + + ret = display_read_edid(dev, edid, EDID_EXT_SIZE); + if (ret) { + printf("Cannot read edid: %d\n", ret); + return CMD_RET_FAILURE; + } + + edid_print_info((struct edid1_info *)edid); + + return CMD_RET_SUCCESS; +} + +U_BOOT_CMD(read_edid, 1, 0, do_read_edid, + "Read and print EDID from display", + "" +); |