[PATCH v2] video/hdmi: minor fixes for *_infoframe_init functions

From: Nikita Zhandarovich
Date: Thu Apr 13 2023 - 10:23:05 EST

Multiple hdmi_*_infoframe_init() functions that initialize different
types of hdmi infoframes only return default 0 value (contrary to their
descriptions). Yet these functions are still checked against possible
errors in case of failure.

This patch removes redundant checks for errors in calls to following
functions:
- hdmi_spd_infoframe_init
- hdmi_audio_infoframe_init
- hdmi_vendor_infoframe_init
- hdmi_drm_infoframe_init

Also, change their return types to void and fix descriptions.

Fixes: 2c676f378edb ("[media] hdmi: added unpack and logging functions for InfoFrames")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>
---
v2: Fix build warning by removing unnecessary call to drm_WARN_ON()
with uninitialized value.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/oe-kbuild-all/202304131234.hT3mzkju-lkp@xxxxxxxxx/

drivers/gpu/drm/display/drm_hdmi_helper.c | 5 +---
drivers/gpu/drm/drm_edid.c | 5 +---
drivers/gpu/drm/i915/display/intel_hdmi.c | 4 +--
drivers/gpu/drm/mediatek/mtk_hdmi.c | 14 ++--------
drivers/gpu/drm/radeon/r600_hdmi.c
drivers/gpu/drm/display/drm_hdmi_helper.c | 5 +---
drivers/gpu/drm/drm_edid.c | 5 +---
drivers/gpu/drm/i915/display/intel_hdmi.c | 7 ++---
drivers/gpu/drm/mediatek/mtk_hdmi.c | 14 ++--------
drivers/gpu/drm/radeon/r600_hdmi.c | 6 +----
drivers/gpu/drm/sti/sti_hdmi.c | 6 +----
drivers/gpu/drm/tegra/hdmi.c | 7 +----
drivers/gpu/drm/tegra/sor.c | 6 +----
drivers/gpu/drm/vc4/vc4_hdmi.c | 7 +----
drivers/video/hdmi.c | 44 ++++++-------------------------
include/linux/hdmi.h | 8 +++---
11 files changed, 23 insertions(+), 92 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_helper.c b/drivers/gpu/drm/display/drm_hdmi_helper.c
index faf5e9efa7d3..ce7038a3a183 100644
--- a/drivers/gpu/drm/display/drm_hdmi_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_helper.c
@@ -27,7 +27,6 @@ int drm_hdmi_infoframe_set_hdr_metadata(struct hdmi_drm_infoframe *frame,
{
struct drm_connector *connector;
struct hdr_output_metadata *hdr_metadata;
- int err;

if (!frame || !conn_state)
return -EINVAL;
@@ -47,9 +46,7 @@ int drm_hdmi_infoframe_set_hdr_metadata(struct hdmi_drm_infoframe *frame,
connector->hdr_sink_metadata.hdmi_type1.eotf))
DRM_DEBUG_KMS("Unknown EOTF %d\n", hdr_metadata->hdmi_metadata_type1.eotf);

- err = hdmi_drm_infoframe_init(frame);
- if (err < 0)
- return err;
+ hdmi_drm_infoframe_init(frame);

frame->eotf = hdr_metadata->hdmi_metadata_type1.eotf;
frame->metadata_type = hdr_metadata->hdmi_metadata_type1.metadata_type;
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 261a62e15934..c268148502d6 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -7159,7 +7159,6 @@ drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
*/
bool has_hdmi_infoframe = connector ?
connector->display_info.has_hdmi_infoframe : false;
- int err;

if (!frame || !mode)
return -EINVAL;
@@ -7167,9 +7166,7 @@ drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
if (!has_hdmi_infoframe)
return -EINVAL;

- err = hdmi_vendor_infoframe_init(frame);
- if (err < 0)
- return err;
+ hdmi_vendor_infoframe_init(frame);

/*
* Even if it's not absolutely necessary to send the infoframe
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index c0ce6d3dc505..59e2f53015c0 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -778,12 +778,9 @@ intel_hdmi_compute_spd_infoframe(struct intel_encoder *encoder,
intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_SPD);

if (IS_DGFX(i915))
- ret = hdmi_spd_infoframe_init(frame, "Intel", "Discrete gfx");
+ hdmi_spd_infoframe_init(frame, "Intel", "Discrete gfx");
else
- ret = hdmi_spd_infoframe_init(frame, "Intel", "Integrated gfx");
-
- if (drm_WARN_ON(encoder->base.dev, ret))
- return false;
+ hdmi_spd_infoframe_init(frame, "Intel", "Integrated gfx");

frame->sdi = HDMI_SPD_SDI_PC;

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 0a8e0a13f516..75899e4a011f 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -995,12 +995,7 @@ static int mtk_hdmi_setup_spd_infoframe(struct mtk_hdmi *hdmi,
u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_SPD_INFOFRAME_SIZE];
ssize_t err;

- err = hdmi_spd_infoframe_init(&frame, vendor, product);
- if (err < 0) {
- dev_err(hdmi->dev, "Failed to initialize SPD infoframe: %zd\n",
- err);
- return err;
- }
+ hdmi_spd_infoframe_init(&frame, vendor, product);

err = hdmi_spd_infoframe_pack(&frame, buffer, sizeof(buffer));
if (err < 0) {
@@ -1018,12 +1013,7 @@ static int mtk_hdmi_setup_audio_infoframe(struct mtk_hdmi *hdmi)
u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AUDIO_INFOFRAME_SIZE];
ssize_t err;

- err = hdmi_audio_infoframe_init(&frame);
- if (err < 0) {
- dev_err(hdmi->dev, "Failed to setup audio infoframe: %zd\n",
- err);
- return err;
- }
+ hdmi_audio_infoframe_init(&frame);

frame.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
frame.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index f3551ebaa2f0..b690254562e8 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -432,11 +432,7 @@ void r600_hdmi_update_audio_settings(struct drm_encoder *encoder)
DRM_DEBUG("0x%02X IEC60958 status bits and 0x%02X category code\n",
(int)audio.status_bits, (int)audio.category_code);

- err = hdmi_audio_infoframe_init(&frame);
- if (err < 0) {
- DRM_ERROR("failed to setup audio infoframe\n");
- return;
- }
+ hdmi_audio_infoframe_init(&frame);

frame.channels = audio.channels;

diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 8539fe1fedc4..1f92db1fb960 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1321,11 +1321,7 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
}

/* Initialize audio infoframe */
- err = hdmi_audio_infoframe_init(&hdmi->audio.cea);
- if (err) {
- DRM_ERROR("Failed to init audio infoframe\n");
- goto err_sysfs;
- }
+ hdmi_audio_infoframe_init(&hdmi->audio.cea);

cec_fill_conn_info_from_drm(&conn_info, drm_connector);
hdmi->notifier = cec_notifier_conn_register(&hdmi->dev, NULL,
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 40ec3e6cf204..fe8fcd1b056b 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -747,12 +747,7 @@ static void tegra_hdmi_setup_audio_infoframe(struct tegra_hdmi *hdmi)
u8 buffer[14];
ssize_t err;

- err = hdmi_audio_infoframe_init(&frame);
- if (err < 0) {
- dev_err(hdmi->dev, "failed to setup audio infoframe: %zd\n",
- err);
- return;
- }
+ hdmi_audio_infoframe_init(&frame);

frame.channels = hdmi->format.channels;

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 8af632740673..d8cd93d5af10 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -2021,11 +2021,7 @@ static int tegra_sor_hdmi_enable_audio_infoframe(struct tegra_sor *sor)
u32 value;
int err;

- err = hdmi_audio_infoframe_init(&frame);
- if (err < 0) {
- dev_err(sor->dev, "failed to setup audio infoframe: %d\n", err);
- return err;
- }
+ hdmi_audio_infoframe_init(&frame);

frame.channels = sor->format.channels;

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index ea22c9bf223a..d7de86b41901 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -816,13 +816,8 @@ static void vc4_hdmi_set_avi_infoframe(struct drm_encoder *encoder)
static void vc4_hdmi_set_spd_infoframe(struct drm_encoder *encoder)
{
union hdmi_infoframe frame;
- int ret;

- ret = hdmi_spd_infoframe_init(&frame.spd, "Broadcom", "Videocore");
- if (ret < 0) {
- DRM_ERROR("couldn't fill SPD infoframe\n");
- return;
- }
+ hdmi_spd_infoframe_init(&frame.spd, "Broadcom", "Videocore");

frame.spd.sdi = HDMI_SPD_SDI_PC;

diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 03c7f27dde49..a4a1359415a0 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -216,10 +216,8 @@ EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
* @frame: HDMI SPD infoframe
* @vendor: vendor string
* @product: product string
- *
- * Returns 0 on success or a negative error code on failure.
*/
-int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
+void hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
const char *vendor, const char *product)
{
size_t len;
@@ -234,8 +232,6 @@ int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
memcpy(frame->vendor, vendor, min(len, sizeof(frame->vendor)));
len = strlen(product);
memcpy(frame->product, product, min(len, sizeof(frame->product)));
-
- return 0;
}
EXPORT_SYMBOL(hdmi_spd_infoframe_init);

@@ -348,18 +344,14 @@ EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
/**
* hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
* @frame: HDMI audio infoframe
- *
- * Returns 0 on success or a negative error code on failure.
*/
-int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
+void hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));

frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
frame->version = 1;
frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
-
- return 0;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_init);

@@ -526,10 +518,8 @@ EXPORT_SYMBOL(hdmi_audio_infoframe_pack_for_dp);
/**
* hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
* @frame: HDMI vendor infoframe
- *
- * Returns 0 on success or a negative error code on failure.
*/
-int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
+void hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));

@@ -544,8 +534,6 @@ int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
*/
frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
frame->length = HDMI_VENDOR_INFOFRAME_SIZE;
-
- return 0;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_init);

@@ -698,18 +686,14 @@ hdmi_vendor_any_infoframe_check_only(const union hdmi_vendor_any_infoframe *fram
* hdmi_drm_infoframe_init() - initialize an HDMI Dynaminc Range and
* mastering infoframe
* @frame: HDMI DRM infoframe
- *
- * Returns 0 on success or a negative error code on failure.
*/
-int hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame)
+void hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));

frame->type = HDMI_INFOFRAME_TYPE_DRM;
frame->version = 1;
frame->length = HDMI_DRM_INFOFRAME_SIZE;
-
- return 0;
}
EXPORT_SYMBOL(hdmi_drm_infoframe_init);

@@ -1661,7 +1645,6 @@ static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
- int ret;

if (size < HDMI_INFOFRAME_SIZE(SPD))
return -EINVAL;
@@ -1677,9 +1660,7 @@ static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,

ptr += HDMI_INFOFRAME_HEADER_SIZE;

- ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
- if (ret)
- return ret;
+ hdmi_spd_infoframe_init(frame, ptr, ptr + 8);

frame->sdi = ptr[24];

@@ -1703,7 +1684,6 @@ static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
- int ret;

if (size < HDMI_INFOFRAME_SIZE(AUDIO))
return -EINVAL;
@@ -1717,9 +1697,7 @@ static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
return -EINVAL;

- ret = hdmi_audio_infoframe_init(frame);
- if (ret)
- return ret;
+ hdmi_audio_infoframe_init(frame);

ptr += HDMI_INFOFRAME_HEADER_SIZE;

@@ -1755,7 +1733,6 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
{
const u8 *ptr = buffer;
size_t length;
- int ret;
u8 hdmi_video_format;
struct hdmi_vendor_infoframe *hvf = &frame->hdmi;

@@ -1789,9 +1766,7 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
if (hdmi_video_format > 0x2)
return -EINVAL;

- ret = hdmi_vendor_infoframe_init(hvf);
- if (ret)
- return ret;
+ hdmi_vendor_infoframe_init(hvf);

hvf->length = length;

@@ -1837,15 +1812,12 @@ int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
const u8 *temp;
u8 x_lsb, x_msb;
u8 y_lsb, y_msb;
- int ret;
int i;

if (size < HDMI_DRM_INFOFRAME_SIZE)
return -EINVAL;

- ret = hdmi_drm_infoframe_init(frame);
- if (ret)
- return ret;
+ hdmi_drm_infoframe_init(frame);

frame->eotf = ptr[0] & 0x7;
frame->metadata_type = ptr[1] & 0x7;
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index 2f4dcc8d060e..e60a28d181f2 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -214,7 +214,7 @@ ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
ssize_t hdmi_avi_infoframe_pack_only(const struct hdmi_avi_infoframe *frame,
void *buffer, size_t size);
int hdmi_avi_infoframe_check(struct hdmi_avi_infoframe *frame);
-int hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame);
+void hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame);
ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame, void *buffer,
size_t size);
ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
@@ -249,7 +249,7 @@ struct hdmi_spd_infoframe {
enum hdmi_spd_sdi sdi;
};

-int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
+void hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
const char *vendor, const char *product);
ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
size_t size);
@@ -331,7 +331,7 @@ struct hdmi_audio_infoframe {

};

-int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame);
+void hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame);
ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
void *buffer, size_t size);
ssize_t hdmi_audio_infoframe_pack_only(const struct hdmi_audio_infoframe *frame,
@@ -393,7 +393,7 @@ struct hdr_sink_metadata {
};
};

-int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame);
+void hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame);
ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
void *buffer, size_t size);
ssize_t hdmi_vendor_infoframe_pack_only(const struct hdmi_vendor_infoframe *frame,