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128 lines
4.2 KiB
Diff
128 lines
4.2 KiB
Diff
From 460d0537c4061a636e5f66a6db3d97ab4504cd83 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Fri, 15 Sep 2023 17:25:17 +0100
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Subject: [PATCH] drm/edid: Add option to report basic audio support with a
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generic edid
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Hardware that fails to read the edid is quite common.
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The kernel provides a mechanism to use one a of a few
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pre-built generic edid files for getting a basic video mode.
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However there is no easy was to add basic audio support,
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which requires a CTA extension block to report capabilities.
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Add an module option to request this.
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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drivers/gpu/drm/drm_edid.c | 16 +++++++++++++++
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drivers/gpu/drm/drm_edid_load.c | 36 +++++++++++++++++++++++++++++++++
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include/drm/drm_edid.h | 2 ++
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3 files changed, 54 insertions(+)
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--- a/drivers/gpu/drm/drm_edid.c
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+++ b/drivers/gpu/drm/drm_edid.c
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@@ -2091,6 +2091,22 @@ static struct edid *edid_filter_invalid_
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return new;
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}
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+/*
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+ * add a CTA extension (block) comtaining audio support
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+ * fix up the base extension to include the extra
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+ * extension and report as digital (required for audio)
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+ * and fix up checksums.
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+ */
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+void drm_edid_add_audio_extension(void *block)
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+{
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+ struct edid *edid = block;
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+ edid->input = DRM_EDID_INPUT_DIGITAL;
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+ edid->extensions++;
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+ edid->checksum = edid_block_compute_checksum(edid);
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+ edid = block + EDID_LENGTH;
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+ edid->checksum = edid_block_compute_checksum(edid);
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+}
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+
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#define DDC_SEGMENT_ADDR 0x30
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/**
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* drm_do_probe_ddc_edid() - get EDID information via I2C
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--- a/drivers/gpu/drm/drm_edid_load.c
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+++ b/drivers/gpu/drm/drm_edid_load.c
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@@ -22,6 +22,9 @@ module_param_string(edid_firmware, edid_
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MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
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"from built-in data or /lib/firmware instead. ");
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+static bool support_audio;
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+module_param(support_audio, bool, 0400);
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+
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/* Use only for backward compatibility with drm_kms_helper.edid_firmware */
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int __drm_set_edid_firmware_path(const char *path)
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{
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@@ -167,12 +170,29 @@ static int edid_size(const u8 *edid, int
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return (edid[0x7e] + 1) * EDID_LENGTH;
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}
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+/* Minimal edid extension block that reports basic audio support */
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+static const u8 generic_edid_audio[] = {
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+ 0x02, /* CTA extension block */
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+ 0x03, /* version */
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+ 0x12, /* 18 bytes are valid */
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+ 0xc0, /* underscan | basic audio */
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+ 0x23, /* Audio Data Block, length 3 */
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+ 0x09, /* Linear PCM, 2 channel */
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+ 0x07, /* Supported sample rates (kHz): 48 44.1 32 */
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+ 0x07, /* Supported sample sizes (bits): 24 20 16 */
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+ 0x83, /* Speaker Allocation Data Block, length 3 */
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+ 0x01, 0x00, 0x00, /* FL/FR */
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+ 0x65, /* Vendor-Specific Data Block, length 3 */
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+ 0x03, 0x0c, 0x00, 0x00, 0x00, /* HDMI PA:0.0.0.0 */
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+};
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+
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static void *edid_load(struct drm_connector *connector, const char *name,
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const char *connector_name)
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{
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const struct firmware *fw = NULL;
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const u8 *fwdata;
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u8 *edid;
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+ u8 *fwdata2 = NULL;
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int fwsize, builtin;
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int i, valid_extensions = 0;
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bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS);
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@@ -181,6 +201,20 @@ static void *edid_load(struct drm_connec
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if (builtin >= 0) {
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fwdata = generic_edid[builtin];
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fwsize = sizeof(generic_edid[builtin]);
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+ if (support_audio) {
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+ fwdata2 = kzalloc(fwsize + EDID_LENGTH, GFP_KERNEL);
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+ if (!fwdata2) {
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+ drm_err(connector->dev,
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+ "[CONNECTOR:%d:%s] Failed to allocate combined EDID firmware \"%s\"\n",
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+ connector->base.id, connector->name, name);
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+ return ERR_PTR(-ENOMEM);
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+ }
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+ memcpy(fwdata2, fwdata, fwsize);
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+ memcpy(fwdata2 + fwsize, generic_edid_audio, sizeof generic_edid_audio);
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+ drm_edid_add_audio_extension(fwdata2);
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+ fwsize += EDID_LENGTH;
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+ fwdata = fwdata2;
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+ }
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} else {
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struct platform_device *pdev;
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int err;
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@@ -260,6 +294,8 @@ static void *edid_load(struct drm_connec
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out:
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release_firmware(fw);
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+ if (fwdata2)
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+ kfree(fwdata2);
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return edid;
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}
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--- a/include/drm/drm_edid.h
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+++ b/include/drm/drm_edid.h
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@@ -614,4 +614,6 @@ int drm_edid_connector_update(struct drm
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const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
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int ext_id, int *ext_index);
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+void drm_edid_add_audio_extension(void *block);
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+
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#endif /* __DRM_EDID_H__ */
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