From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Guillaume Ranquet <granquet@baylibre.com>,
chunkuang.hu@kernel.org, p.zabel@pengutronix.de,
airlied@linux.ie, daniel@ffwll.ch, robh+dt@kernel.org,
maarten.lankhorst@linux.intel.com, mripard@kernel.org,
tzimmermann@suse.de, matthias.bgg@gmail.com,
chunfeng.yun@mediatek.com, kishon@ti.com, vkoul@kernel.org,
deller@gmx.de, ck.hu@mediatek.com, jitao.shi@mediatek.com
Cc: dri-devel@lists.freedesktop.org,
linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-phy@lists.infradead.org, linux-fbdev@vger.kernel.org,
Markus Schneider-Pargmann <msp@baylibre.com>
Subject: Re: [PATCH v8 04/19] video/hdmi: Add audio_infoframe packing for DP
Date: Mon, 21 Feb 2022 15:30:07 +0100 [thread overview]
Message-ID: <a7605c9f-55f9-c7cc-f2b9-89ddbffb4927@collabora.com> (raw)
In-Reply-To: <20220218145437.18563-5-granquet@baylibre.com>
Il 18/02/22 15:54, Guillaume Ranquet ha scritto:
> 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.
>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> ---
> drivers/video/hdmi.c | 83 ++++++++++++++++++++++++++++---------
> include/drm/drm_dp_helper.h | 2 +
> include/linux/hdmi.h | 7 +++-
> 3 files changed, 72 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> index 947be761dfa40..63e74d9fd210e 100644
> --- a/drivers/video/hdmi.c
> +++ b/drivers/video/hdmi.c
> @@ -21,6 +21,7 @@
> * DEALINGS IN THE SOFTWARE.
> */
>
> +#include <drm/drm_dp_helper.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 +486,44 @@ 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
This fits in one line (82 cols is ok)... but, anyway, please capitalize D and P
in the DisplayPort word.
> + *
> + * @frame HDMI Audio infoframe
You're almost there! You missed a colon after each description.
Also, I personally like seeing indented descriptions as, in my opinion, this
enhances human readability, as it's a bit more pleasing to the eye... but
it's not a requirement, so you be the judge.
* @frame: HDMI Audio infoframe
* @sdp: Secondary data packet......
* @dp_version: DisplayPort version......
Please fix.
> + * @sdp secondary data packet for display port. This is filled with the
> + * appropriate data
> + * @dp_version Display Port version to be encoded in the header
> + *
> + * Packs a HDMI Audio Infoframe to be sent over Display Port. This function
> + * fills the secondary data packet to be used for Display Port.
> + *
> + * 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
Please, C-style comments:
/* Secondary-data packet header */
Thanks,
Angelo
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next prev parent reply other threads:[~2022-02-21 14:31 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 14:54 [PATCH v8 0/19] drm/mediatek: Add mt8195 DisplayPort driver Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 01/19] dt-bindings: mediatek,dpi: Add DP_INTF compatible Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 02/19] dt-bindings: mediatek,dp: Add Display Port binding Guillaume Ranquet
2022-02-21 2:36 ` [PATCH v8 02/19] dt-bindings: mediatek, dp: " Rob Herring
2022-02-18 14:54 ` [PATCH v8 03/19] drm/edid: Add cea_sad helpers for freq/length Guillaume Ranquet
2022-02-21 14:30 ` AngeloGioacchino Del Regno
2022-02-25 10:35 ` Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 04/19] video/hdmi: Add audio_infoframe packing for DP Guillaume Ranquet
2022-02-21 14:30 ` AngeloGioacchino Del Regno [this message]
2022-02-25 10:38 ` Guillaume Ranquet
2022-02-22 15:16 ` AngeloGioacchino Del Regno
2022-02-25 10:40 ` Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 05/19] drm/mediatek: dpi: move dpi limits to board config Guillaume Ranquet
2022-02-21 1:46 ` Chun-Kuang Hu
2022-02-25 10:45 ` Guillaume Ranquet
2022-02-21 14:30 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 06/19] drm/mediatek: dpi: implement a CK/DE pol toggle in " Guillaume Ranquet
2022-02-21 2:14 ` Chun-Kuang Hu
2022-02-25 10:52 ` Guillaume Ranquet
2022-02-21 14:30 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 07/19] drm/mediatek: dpi: implement a swap_input " Guillaume Ranquet
2022-02-21 2:32 ` Chun-Kuang Hu
2022-02-25 10:55 ` Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 08/19] drm/mediatek: dpi: move dimension mask to " Guillaume Ranquet
2022-02-21 2:40 ` Chun-Kuang Hu
2022-02-21 2:42 ` Chun-Kuang Hu
2022-02-21 14:30 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 09/19] drm/mediatek: dpi: move dimension_mask " Guillaume Ranquet
2022-02-21 2:43 ` Chun-Kuang Hu
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 10/19] drm/mediatek: dpi: move swap_shift " Guillaume Ranquet
2022-02-21 3:24 ` Chun-Kuang Hu
2022-02-25 11:10 ` Guillaume Ranquet
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 11/19] drm/mediatek: dpi: move the yuv422_en_bit " Guillaume Ranquet
2022-02-21 3:31 ` Chun-Kuang Hu
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 12/19] drm/mediatek: dpi: move the csc_enable bit " Guillaume Ranquet
2022-02-21 3:33 ` Chun-Kuang Hu
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 13/19] drm/mediatek: dpi: Add dpintf support Guillaume Ranquet
2022-02-21 4:34 ` Chun-Kuang Hu
2022-02-21 9:44 ` Maxime Ripard
2022-02-25 11:25 ` Guillaume Ranquet
2022-02-21 14:30 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 14/19] phy: phy-mtk-dp: Add driver for DP phy Guillaume Ranquet
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-25 11:49 ` Guillaume Ranquet
2022-02-25 12:06 ` AngeloGioacchino Del Regno
2022-02-18 14:54 ` [PATCH v8 15/19] drm/mediatek: Add mt8195 Embedded DisplayPort driver Guillaume Ranquet
2022-02-21 14:31 ` AngeloGioacchino Del Regno
2022-02-24 13:57 ` AngeloGioacchino Del Regno
2022-02-25 9:45 ` CK Hu
2022-02-25 13:04 ` Guillaume Ranquet
2022-03-04 2:42 ` CK Hu
2022-02-18 14:54 ` [PATCH v8 16/19] drm/mediatek: Add mt8195 External DisplayPort support Guillaume Ranquet
2022-02-18 14:54 ` [PATCH v8 17/19] drm/mediatek: add hpd debounce Guillaume Ranquet
2022-03-16 6:48 ` Rex-BC Chen
2022-03-18 9:03 ` Wei-Shun Chang
2022-03-21 7:24 ` Rex-BC Chen
2022-02-18 14:54 ` [PATCH v8 18/19] drm/mediatek: change the aux retries times when receiving AUX_DEFER Guillaume Ranquet
2022-03-16 13:35 ` Chen-Yu Tsai
2022-02-18 14:54 ` [PATCH v8 19/19] drm/mediatek: DP audio support for mt8195 Guillaume Ranquet
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