From: Bo-Chen Chen <rex-bc.chen@mediatek.com>
To: <chunkuang.hu@kernel.org>, <p.zabel@pengutronix.de>,
<daniel@ffwll.ch>, <robh+dt@kernel.org>,
<krzysztof.kozlowski+dt@linaro.org>, <mripard@kernel.org>,
<tzimmermann@suse.de>, <matthias.bgg@gmail.com>, <deller@gmx.de>,
<airlied@linux.ie>
Cc: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org,
granquet@baylibre.com, jitao.shi@mediatek.com,
liangxu.xu@mediatek.com, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, msp@baylibre.com,
Project_Global_Chrome_Upstream_Group@mediatek.com,
Bo-Chen Chen <rex-bc.chen@mediatek.com>,
linux-mediatek@lists.infradead.org, wenst@chromium.org,
linux-arm-kernel@lists.infradead.org,
angelogioacchino.delregno@collabora.com
Subject: [PATCH v15 04/11] video/hdmi: Add audio_infoframe packing for DP
Date: Wed, 27 Jul 2022 12:50:28 +0800 [thread overview]
Message-ID: <20220727045035.32225-5-rex-bc.chen@mediatek.com> (raw)
In-Reply-To: <20220727045035.32225-1-rex-bc.chen@mediatek.com>
From: Markus Schneider-Pargmann <msp@baylibre.com>
Similar to HDMI, DP uses audio infoframes as well which are structured
very similar to the HDMI ones.
This patch adds a helper function to pack the HDMI audio infoframe for
DP, called hdmi_audio_infoframe_pack_for_dp().
hdmi_audio_infoframe_pack_only() is split into two parts. One of them
packs the payload only and can be used for HDMI and DP.
Also constify the frame parameter in hdmi_audio_infoframe_check() as
it is passed to hdmi_audio_infoframe_check_only() which expects a const.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
---
drivers/video/hdmi.c | 82 +++++++++++++++++++++++++++---------
include/drm/display/drm_dp.h | 2 +
include/linux/hdmi.h | 7 ++-
3 files changed, 71 insertions(+), 20 deletions(-)
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 947be761dfa4..03c7f27dde49 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -21,6 +21,7 @@
* DEALINGS IN THE SOFTWARE.
*/
+#include <drm/display/drm_dp.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/errno.h>
@@ -381,12 +382,34 @@ static int hdmi_audio_infoframe_check_only(const struct hdmi_audio_infoframe *fr
*
* Returns 0 on success or a negative error code on failure.
*/
-int hdmi_audio_infoframe_check(struct hdmi_audio_infoframe *frame)
+int hdmi_audio_infoframe_check(const struct hdmi_audio_infoframe *frame)
{
return hdmi_audio_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_audio_infoframe_check);
+static void
+hdmi_audio_infoframe_pack_payload(const struct hdmi_audio_infoframe *frame,
+ u8 *buffer)
+{
+ u8 channels;
+
+ if (frame->channels >= 2)
+ channels = frame->channels - 1;
+ else
+ channels = 0;
+
+ buffer[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
+ buffer[1] = ((frame->sample_frequency & 0x7) << 2) |
+ (frame->sample_size & 0x3);
+ buffer[2] = frame->coding_type_ext & 0x1f;
+ buffer[3] = frame->channel_allocation;
+ buffer[4] = (frame->level_shift_value & 0xf) << 3;
+
+ if (frame->downmix_inhibit)
+ buffer[4] |= BIT(7);
+}
+
/**
* hdmi_audio_infoframe_pack_only() - write HDMI audio infoframe to binary buffer
* @frame: HDMI audio infoframe
@@ -404,7 +427,6 @@ EXPORT_SYMBOL(hdmi_audio_infoframe_check);
ssize_t hdmi_audio_infoframe_pack_only(const struct hdmi_audio_infoframe *frame,
void *buffer, size_t size)
{
- unsigned char channels;
u8 *ptr = buffer;
size_t length;
int ret;
@@ -420,28 +442,13 @@ ssize_t hdmi_audio_infoframe_pack_only(const struct hdmi_audio_infoframe *frame,
memset(buffer, 0, size);
- if (frame->channels >= 2)
- channels = frame->channels - 1;
- else
- channels = 0;
-
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
- /* start infoframe payload */
- ptr += HDMI_INFOFRAME_HEADER_SIZE;
-
- ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
- ptr[1] = ((frame->sample_frequency & 0x7) << 2) |
- (frame->sample_size & 0x3);
- ptr[2] = frame->coding_type_ext & 0x1f;
- ptr[3] = frame->channel_allocation;
- ptr[4] = (frame->level_shift_value & 0xf) << 3;
-
- if (frame->downmix_inhibit)
- ptr[4] |= BIT(7);
+ hdmi_audio_infoframe_pack_payload(frame,
+ ptr + HDMI_INFOFRAME_HEADER_SIZE);
hdmi_infoframe_set_checksum(buffer, length);
@@ -479,6 +486,43 @@ ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
+/**
+ * hdmi_audio_infoframe_pack_for_dp - Pack a HDMI Audio infoframe for DisplayPort
+ *
+ * @frame: HDMI Audio infoframe
+ * @sdp: Secondary data packet for DisplayPort.
+ * @dp_version: DisplayPort version to be encoded in the header
+ *
+ * Packs a HDMI Audio Infoframe to be sent over DisplayPort. This function
+ * fills the secondary data packet to be used for DisplayPort.
+ *
+ * Return: Number of total written bytes or a negative errno on failure.
+ */
+ssize_t
+hdmi_audio_infoframe_pack_for_dp(const struct hdmi_audio_infoframe *frame,
+ struct dp_sdp *sdp, u8 dp_version)
+{
+ int ret;
+
+ ret = hdmi_audio_infoframe_check(frame);
+ if (ret)
+ return ret;
+
+ memset(sdp->db, 0, sizeof(sdp->db));
+
+ /* Secondary-data packet header */
+ sdp->sdp_header.HB0 = 0;
+ sdp->sdp_header.HB1 = frame->type;
+ sdp->sdp_header.HB2 = DP_SDP_AUDIO_INFOFRAME_HB2;
+ sdp->sdp_header.HB3 = (dp_version & 0x3f) << 2;
+
+ hdmi_audio_infoframe_pack_payload(frame, sdp->db);
+
+ /* Return size = frame length + four HB for sdp_header */
+ return frame->length + 4;
+}
+EXPORT_SYMBOL(hdmi_audio_infoframe_pack_for_dp);
+
/**
* hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
* @frame: HDMI vendor infoframe
diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
index 9e3aff7e68bb..6c0871164771 100644
--- a/include/drm/display/drm_dp.h
+++ b/include/drm/display/drm_dp.h
@@ -1536,6 +1536,8 @@ enum drm_dp_phy {
#define DP_SDP_VSC_EXT_CEA 0x21 /* DP 1.4 */
/* 0x80+ CEA-861 infoframe types */
+#define DP_SDP_AUDIO_INFOFRAME_HB2 0x1b
+
/**
* struct dp_sdp_header - DP secondary data packet header
* @HB0: Secondary Data Packet ID
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index c8ec982ff498..2f4dcc8d060e 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -336,7 +336,12 @@ 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,
void *buffer, size_t size);
-int hdmi_audio_infoframe_check(struct hdmi_audio_infoframe *frame);
+int hdmi_audio_infoframe_check(const struct hdmi_audio_infoframe *frame);
+
+struct dp_sdp;
+ssize_t
+hdmi_audio_infoframe_pack_for_dp(const struct hdmi_audio_infoframe *frame,
+ struct dp_sdp *sdp, u8 dp_version);
enum hdmi_3d_structure {
HDMI_3D_STRUCTURE_INVALID = -1,
--
2.18.0
next prev parent reply other threads:[~2022-07-27 4:51 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-27 4:50 [PATCH v15 00/11] drm/mediatek: Add MT8195 DisplayPort driver Bo-Chen Chen
2022-07-27 4:50 ` [PATCH v15 01/11] dt-bindings: mediatek,dp: Add Display Port binding Bo-Chen Chen
2022-07-27 7:23 ` Krzysztof Kozlowski
2022-07-28 9:39 ` Rex-BC Chen
2022-07-27 4:50 ` [PATCH v15 02/11] drm/edid: Convert cea_sad helper struct to kernelDoc Bo-Chen Chen
2022-07-27 4:50 ` [PATCH v15 03/11] drm/edid: Add cea_sad helpers for freq/length Bo-Chen Chen
2022-07-27 9:34 ` AngeloGioacchino Del Regno
2022-08-02 14:11 ` Jani Nikula
2022-08-05 6:54 ` Rex-BC Chen
2022-08-05 7:54 ` Jani Nikula
2022-07-27 4:50 ` Bo-Chen Chen [this message]
2022-07-27 9:35 ` [PATCH v15 04/11] video/hdmi: Add audio_infoframe packing for DP AngeloGioacchino Del Regno
2022-07-27 4:50 ` [PATCH v15 05/11] drm/mediatek: Add MT8195 Embedded DisplayPort driver Bo-Chen Chen
2022-07-27 9:36 ` AngeloGioacchino Del Regno
2022-08-02 2:56 ` CK Hu
2022-08-02 5:09 ` CK Hu
2022-08-05 8:22 ` Rex-BC Chen
2022-08-02 7:57 ` CK Hu
2022-07-27 4:50 ` [PATCH v15 06/11] drm/mediatek: Add MT8195 External DisplayPort support Bo-Chen Chen
2022-07-27 9:38 ` AngeloGioacchino Del Regno
2022-08-02 2:37 ` CK Hu
2022-08-03 5:47 ` Rex-BC Chen
2022-07-27 4:50 ` [PATCH v15 07/11] drm/mediatek: Add retry to prevent misjudgment for sink devices Bo-Chen Chen
2022-07-27 9:40 ` AngeloGioacchino Del Regno
2022-07-28 9:40 ` Rex-BC Chen
2022-08-05 7:10 ` Rex-BC Chen
2022-07-27 4:50 ` [PATCH v15 08/11] drm/mediatek: add hpd debounce Bo-Chen Chen
2022-07-27 4:50 ` [PATCH v15 09/11] drm/mediatek: set monitor to DP_SET_POWER_D3 to avoid garbage Bo-Chen Chen
2022-07-27 4:50 ` [PATCH v15 10/11] drm/mediatek: DP audio support for MT8195 Bo-Chen Chen
2022-07-27 4:50 ` [PATCH v15 11/11] drm/mediatek: Use cached audio config when changing resolution Bo-Chen Chen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220727045035.32225-5-rex-bc.chen@mediatek.com \
--to=rex-bc.chen@mediatek.com \
--cc=Project_Global_Chrome_Upstream_Group@mediatek.com \
--cc=airlied@linux.ie \
--cc=angelogioacchino.delregno@collabora.com \
--cc=chunkuang.hu@kernel.org \
--cc=daniel@ffwll.ch \
--cc=deller@gmx.de \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=granquet@baylibre.com \
--cc=jitao.shi@mediatek.com \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=liangxu.xu@mediatek.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=matthias.bgg@gmail.com \
--cc=mripard@kernel.org \
--cc=msp@baylibre.com \
--cc=p.zabel@pengutronix.de \
--cc=robh+dt@kernel.org \
--cc=tzimmermann@suse.de \
--cc=wenst@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).