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Tue, 21 Sep 2021 03:12:47 -0700 (PDT) Date: Tue, 21 Sep 2021 12:12:46 +0200 From: Markus Schneider-Pargmann To: Jani Nikula Cc: Chun-Kuang Hu , Philipp Zabel , Sam Ravnborg , dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 3/6] drm/edid: Add cea_sad helpers for freq/length Message-ID: <20210921101246.g7avjpzxmjmvc4gc@blmsp> References: <20210920084424.231825-1-msp@baylibre.com> <20210920084424.231825-4-msp@baylibre.com> <87mto6tg0k.fsf@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87mto6tg0k.fsf@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210921_031250_383992_95A7FB68 X-CRM114-Status: GOOD ( 27.68 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Hi Jani, On Tue, Sep 21, 2021 at 12:49:31PM +0300, Jani Nikula wrote: > On Mon, 20 Sep 2021, Markus Schneider-Pargmann wrote: > > 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 > > --- > > > > Notes: > > Changes v1 -> v2: > > - Use const struct pointers. > > - Add a check whether the format is actually uncompressed or not. > > > > 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 6325877c5fd6..28df422fbc03 100644 > > --- a/drivers/gpu/drm/drm_edid.c > > +++ b/drivers/gpu/drm/drm_edid.c > > @@ -4666,6 +4666,80 @@ 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 CEA_SAD_FREQ_32KHZ: > > + return 32000; > > + case CEA_SAD_FREQ_44KHZ: > > + return 44100; > > + case CEA_SAD_FREQ_48KHZ: > > + return 48000; > > + case CEA_SAD_FREQ_88KHZ: > > + return 88200; > > + case CEA_SAD_FREQ_96KHZ: > > + return 96000; > > + case CEA_SAD_FREQ_176KHZ: > > + return 176400; > > + case 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 CEA_SAD_UNCOMPRESSED_WORD_16BIT: > > + return 16; > > + case CEA_SAD_UNCOMPRESSED_WORD_20BIT: > > + return 20; > > + case 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 deccfd39e6db..7b7d71a7154d 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 CEA_SAD_FREQ_32KHZ BIT(0) > > +#define CEA_SAD_FREQ_44KHZ BIT(1) > > +#define CEA_SAD_FREQ_48KHZ BIT(2) > > +#define CEA_SAD_FREQ_88KHZ BIT(3) > > +#define CEA_SAD_FREQ_96KHZ BIT(4) > > +#define CEA_SAD_FREQ_176KHZ BIT(5) > > +#define CEA_SAD_FREQ_192KHZ BIT(6) > > + > > +#define CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) > > +#define CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) > > +#define CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2) > > I suggest adding DRM_ prefixes here. Thanks, will do that. Best, Markus > > BR, > Jani. > > > + > > 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); > > -- > Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek