From: Guillaume Ranquet <granquet@baylibre.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
Markus Schneider-Pargmann <msp@baylibre.com>
Subject: [PATCH v7 3/8] drm/edid: Add cea_sad helpers for freq/length
Date: Mon, 27 Dec 2021 10:33:27 +0100 [thread overview]
Message-ID: <20211227093329.5589-1-granquet@baylibre.com> (raw)
In-Reply-To: <20211217150854.2081-1-granquet@baylibre.com>
From: Markus Schneider-Pargmann <msp@baylibre.com>
This patch adds two helper functions that extract the frequency and word
length from a struct cea_sad.
For these helper functions new defines are added that help translate the
'freq' and 'byte2' fields into real numbers.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
---
drivers/gpu/drm/drm_edid.c | 74 ++++++++++++++++++++++++++++++++++++++
include/drm/drm_edid.h | 18 ++++++++--
2 files changed, 90 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 12893e7be89bb..500279a82167a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4747,6 +4747,80 @@ int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
}
EXPORT_SYMBOL(drm_edid_to_speaker_allocation);
+/**
+ * drm_cea_sad_get_sample_rate - Extract the sample rate from cea_sad
+ * @sad: Pointer to the cea_sad struct
+ *
+ * Extracts the cea_sad frequency field and returns the sample rate in Hz.
+ *
+ * Return: Sample rate in Hz or a negative errno if parsing failed.
+ */
+int drm_cea_sad_get_sample_rate(const struct cea_sad *sad)
+{
+ switch (sad->freq) {
+ case DRM_CEA_SAD_FREQ_32KHZ:
+ return 32000;
+ case DRM_CEA_SAD_FREQ_44KHZ:
+ return 44100;
+ case DRM_CEA_SAD_FREQ_48KHZ:
+ return 48000;
+ case DRM_CEA_SAD_FREQ_88KHZ:
+ return 88200;
+ case DRM_CEA_SAD_FREQ_96KHZ:
+ return 96000;
+ case DRM_CEA_SAD_FREQ_176KHZ:
+ return 176400;
+ case DRM_CEA_SAD_FREQ_192KHZ:
+ return 192000;
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(drm_cea_sad_get_sample_rate);
+
+static bool drm_cea_sad_is_uncompressed(const struct cea_sad *sad)
+{
+ switch (sad->format) {
+ case HDMI_AUDIO_CODING_TYPE_STREAM:
+ case HDMI_AUDIO_CODING_TYPE_PCM:
+ return true;
+ default:
+ return false;
+ }
+}
+
+/**
+ * drm_cea_sad_get_uncompressed_word_length - Extract word length
+ * @sad: Pointer to the cea_sad struct
+ *
+ * Extracts the cea_sad byte2 field and returns the word length for an
+ * uncompressed stream.
+ *
+ * Note: This function may only be called for uncompressed audio.
+ *
+ * Return: Word length in bits or a negative errno if parsing failed.
+ */
+int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad)
+{
+ if (!drm_cea_sad_is_uncompressed(sad)) {
+ DRM_WARN("Unable to get the uncompressed word length for a compressed format: %u\n",
+ sad->format);
+ return -EINVAL;
+ }
+
+ switch (sad->byte2) {
+ case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT:
+ return 16;
+ case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT:
+ return 20;
+ case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT:
+ return 24;
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length);
+
/**
* drm_av_sync_delay - compute the HDMI/DP sink audio-video sync delay
* @connector: connector associated with the HDMI/DP sink
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 18f6c700f6d02..a30452b313979 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -361,12 +361,24 @@ struct edid {
/* Short Audio Descriptor */
struct cea_sad {
- u8 format;
+ u8 format; /* See HDMI_AUDIO_CODING_TYPE_* */
u8 channels; /* max number of channels - 1 */
- u8 freq;
+ u8 freq; /* See CEA_SAD_FREQ_* */
u8 byte2; /* meaning depends on format */
};
+#define DRM_CEA_SAD_FREQ_32KHZ BIT(0)
+#define DRM_CEA_SAD_FREQ_44KHZ BIT(1)
+#define DRM_CEA_SAD_FREQ_48KHZ BIT(2)
+#define DRM_CEA_SAD_FREQ_88KHZ BIT(3)
+#define DRM_CEA_SAD_FREQ_96KHZ BIT(4)
+#define DRM_CEA_SAD_FREQ_176KHZ BIT(5)
+#define DRM_CEA_SAD_FREQ_192KHZ BIT(6)
+
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0)
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1)
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2)
+
struct drm_encoder;
struct drm_connector;
struct drm_connector_state;
@@ -374,6 +386,8 @@ struct drm_display_mode;
int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb);
+int drm_cea_sad_get_sample_rate(const struct cea_sad *sad);
+int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad);
int drm_av_sync_delay(struct drm_connector *connector,
const struct drm_display_mode *mode);
--
2.32.0
next prev parent reply other threads:[~2021-12-27 9:34 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20211217150854.2081-1-granquet@baylibre.com>
2021-12-17 15:08 ` [PATCH v7 1/8] dt-bindings: mediatek,dpi: Add DP_INTF compatible Guillaume Ranquet
2021-12-17 15:08 ` [PATCH v7 2/8] dt-bindings: mediatek,dp: Add Display Port binding Guillaume Ranquet
2021-12-17 22:25 ` [PATCH v7 2/8] dt-bindings: mediatek, dp: " Rob Herring
2021-12-17 15:08 ` [PATCH v7 3/8] drm/edid: Add cea_sad helpers for freq/length Guillaume Ranquet
2021-12-17 15:08 ` [PATCH v7 4/8] video/hdmi: Add audio_infoframe packing for DP Guillaume Ranquet
2021-12-17 15:08 ` [PATCH v7 5/8] drm/mediatek: dpi: Add dpintf support Guillaume Ranquet
2022-01-19 9:15 ` CK Hu
2021-12-17 15:08 ` [PATCH v7 6/8] phy: phy-mtk-dp: Add driver for DP phy Guillaume Ranquet
2021-12-29 6:00 ` Vinod Koul
2021-12-30 11:11 ` Guillaume Ranquet
2022-02-07 9:49 ` CK Hu
2021-12-17 15:08 ` [PATCH v7 7/8] drm/mediatek: Add mt8195 DisplayPort driver Guillaume Ranquet
2022-01-03 1:49 ` CK Hu
2021-12-17 15:08 ` [PATCH v7 8/8] drm/mediatek: Add mt8195 eDP support Guillaume Ranquet
2022-02-08 2:49 ` CK Hu
2021-12-27 9:33 ` Guillaume Ranquet [this message]
2021-12-27 9:33 ` [PATCH v7 4/8] video/hdmi: Add audio_infoframe packing for DP Guillaume Ranquet
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