From: Russell King <rmk+kernel@arm.linux.org.uk> To: linux-rockchip@lists.infradead.org, alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Philipp Zabel <p.zabel@pengutronix.de>, Andy Yan <andy.yan@rock-chips.com>, Yakir Yang <ykk@rock-chips.com>, Fabio Estevam <fabio.estevam@freescale.com>, Mark Brown <broonie@kernel.org>, Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>, Sascha Hauer <s.hauer@pengutronix.de>, Jon Nettleton <jon.nettleton@gmail.com>, David Airlie <airlied@linux.ie> Subject: [PATCH 8/9] drm: bridge/dw_hdmi: replace CTS calculation for the ACR Date: Sat, 08 Aug 2015 17:10:42 +0100 [thread overview] Message-ID: <E1ZO6hm-0003Ni-E0@rmk-PC.arm.linux.org.uk> (raw) In-Reply-To: <20150808160936.GN7557@n2100.arm.linux.org.uk> Given the TDMS clock, audio sample rate, and the N parameter, we can calculate the CTS value for the audio clock regenerator (ACR) using the following calculation given in the HDMI specification: CTS = ftdms * N / (128 * fs) The specification says that the CTS value is an average value, which is true if the source hardware measures it. Where source hardware needs it to be programmed, it is particularly difficult to alternate it between two values correctly to ensure that we achieve a correct "average" fractional value at the sink. Also, there's the problem that our "ftdms" is not a fully accurate value; it is rounded to a kHz value. This introduces an unnecessary (and harmless) fractional value into the above equation for combinations like 148.5MHz/1.001 for 44100Hz - we still calculate the correct CTS value. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> --- drivers/gpu/drm/bridge/dw_hdmi.c | 92 +++++++--------------------------------- 1 file changed, 16 insertions(+), 76 deletions(-) diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c index 60487bff48e3..a4f9aecf1862 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.c +++ b/drivers/gpu/drm/bridge/dw_hdmi.c @@ -272,89 +272,29 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk) return n; } -static unsigned int hdmi_compute_cts(unsigned int freq, unsigned long pixel_clk) -{ - unsigned int cts = 0; - - pr_debug("%s: freq: %d pixel_clk: %ld\n", __func__, freq, pixel_clk); - - switch (freq) { - case 32000: - if (pixel_clk == 297000000) { - cts = 222750; - break; - } - case 48000: - case 96000: - case 192000: - switch (pixel_clk) { - case 25200000: - case 27000000: - case 54000000: - case 74250000: - case 148500000: - cts = pixel_clk / 1000; - break; - case 297000000: - cts = 247500; - break; - /* - * All other TMDS clocks are not supported by - * DWC_hdmi_tx. The TMDS clocks divided or - * multiplied by 1,001 coefficients are not - * supported. - */ - default: - break; - } - break; - case 44100: - case 88200: - case 176400: - switch (pixel_clk) { - case 25200000: - cts = 28000; - break; - case 27000000: - cts = 30000; - break; - case 54000000: - cts = 60000; - break; - case 74250000: - cts = 82500; - break; - case 148500000: - cts = 165000; - break; - case 297000000: - cts = 247500; - break; - default: - break; - } - break; - default: - break; - } - return cts; -} - static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi, unsigned long pixel_clk, unsigned int sample_rate) { + unsigned long ftdms = pixel_clk; unsigned int n, cts; + u64 tmp; n = hdmi_compute_n(sample_rate, pixel_clk); - cts = hdmi_compute_cts(sample_rate, pixel_clk); - if (!cts) { - dev_err(hdmi->dev, - "%s: pixel clock/sample rate not supported: %luMHz / %ukHz\n", - __func__, pixel_clk, sample_rate); - } - dev_dbg(hdmi->dev, "%s: samplerate=%ukHz pixelclk=%luMHz N=%d cts=%d\n", - __func__, sample_rate, pixel_clk, n, cts); + /* + * Compute the CTS value from the N value. Note that CTS and N + * can be up to 20 bits in total, so we need 64-bit math. Also + * note that our TDMS clock is not fully accurate; it is accurate + * to kHz. This can introduce an unnecessary remainder in the + * calculation below, so we don't try to warn about that. + */ + tmp = (u64)ftdms * n; + do_div(tmp, 128 * sample_rate); + cts = tmp; + + dev_dbg(hdmi->dev, "%s: fs=%uHz ftdms=%lu.%03luMHz N=%d cts=%d\n", + __func__, sample_rate, ftdms / 1000000, (ftdms / 1000) % 1000, + n, cts); spin_lock_irq(&hdmi->audio_lock); hdmi->audio_n = n; -- 2.1.0
WARNING: multiple messages have this Message-ID (diff)
From: rmk+kernel@arm.linux.org.uk (Russell King) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 8/9] drm: bridge/dw_hdmi: replace CTS calculation for the ACR Date: Sat, 08 Aug 2015 17:10:42 +0100 [thread overview] Message-ID: <E1ZO6hm-0003Ni-E0@rmk-PC.arm.linux.org.uk> (raw) In-Reply-To: <20150808160936.GN7557@n2100.arm.linux.org.uk> Given the TDMS clock, audio sample rate, and the N parameter, we can calculate the CTS value for the audio clock regenerator (ACR) using the following calculation given in the HDMI specification: CTS = ftdms * N / (128 * fs) The specification says that the CTS value is an average value, which is true if the source hardware measures it. Where source hardware needs it to be programmed, it is particularly difficult to alternate it between two values correctly to ensure that we achieve a correct "average" fractional value at the sink. Also, there's the problem that our "ftdms" is not a fully accurate value; it is rounded to a kHz value. This introduces an unnecessary (and harmless) fractional value into the above equation for combinations like 148.5MHz/1.001 for 44100Hz - we still calculate the correct CTS value. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> --- drivers/gpu/drm/bridge/dw_hdmi.c | 92 +++++++--------------------------------- 1 file changed, 16 insertions(+), 76 deletions(-) diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c index 60487bff48e3..a4f9aecf1862 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.c +++ b/drivers/gpu/drm/bridge/dw_hdmi.c @@ -272,89 +272,29 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk) return n; } -static unsigned int hdmi_compute_cts(unsigned int freq, unsigned long pixel_clk) -{ - unsigned int cts = 0; - - pr_debug("%s: freq: %d pixel_clk: %ld\n", __func__, freq, pixel_clk); - - switch (freq) { - case 32000: - if (pixel_clk == 297000000) { - cts = 222750; - break; - } - case 48000: - case 96000: - case 192000: - switch (pixel_clk) { - case 25200000: - case 27000000: - case 54000000: - case 74250000: - case 148500000: - cts = pixel_clk / 1000; - break; - case 297000000: - cts = 247500; - break; - /* - * All other TMDS clocks are not supported by - * DWC_hdmi_tx. The TMDS clocks divided or - * multiplied by 1,001 coefficients are not - * supported. - */ - default: - break; - } - break; - case 44100: - case 88200: - case 176400: - switch (pixel_clk) { - case 25200000: - cts = 28000; - break; - case 27000000: - cts = 30000; - break; - case 54000000: - cts = 60000; - break; - case 74250000: - cts = 82500; - break; - case 148500000: - cts = 165000; - break; - case 297000000: - cts = 247500; - break; - default: - break; - } - break; - default: - break; - } - return cts; -} - static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi, unsigned long pixel_clk, unsigned int sample_rate) { + unsigned long ftdms = pixel_clk; unsigned int n, cts; + u64 tmp; n = hdmi_compute_n(sample_rate, pixel_clk); - cts = hdmi_compute_cts(sample_rate, pixel_clk); - if (!cts) { - dev_err(hdmi->dev, - "%s: pixel clock/sample rate not supported: %luMHz / %ukHz\n", - __func__, pixel_clk, sample_rate); - } - dev_dbg(hdmi->dev, "%s: samplerate=%ukHz pixelclk=%luMHz N=%d cts=%d\n", - __func__, sample_rate, pixel_clk, n, cts); + /* + * Compute the CTS value from the N value. Note that CTS and N + * can be up to 20 bits in total, so we need 64-bit math. Also + * note that our TDMS clock is not fully accurate; it is accurate + * to kHz. This can introduce an unnecessary remainder in the + * calculation below, so we don't try to warn about that. + */ + tmp = (u64)ftdms * n; + do_div(tmp, 128 * sample_rate); + cts = tmp; + + dev_dbg(hdmi->dev, "%s: fs=%uHz ftdms=%lu.%03luMHz N=%d cts=%d\n", + __func__, sample_rate, ftdms / 1000000, (ftdms / 1000) % 1000, + n, cts); spin_lock_irq(&hdmi->audio_lock); hdmi->audio_n = n; -- 2.1.0
next prev parent reply other threads:[~2015-08-08 16:11 UTC|newest] Thread overview: 226+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-08-08 16:02 [PATCH 00/12] dw-hdmi development Russell King - ARM Linux 2015-08-08 16:02 ` Russell King - ARM Linux 2015-08-08 16:02 ` Russell King - ARM Linux 2015-08-08 16:03 ` [PATCH 01/12] drm: bridge/dw_hdmi: remove pixel repetition setting for all VICs Russell King 2015-08-08 16:03 ` Russell King 2015-08-08 16:03 ` [PATCH 02/12] drm: bridge/dw_hdmi: don't support any pixel doubled modes Russell King 2015-08-08 16:03 ` Russell King 2015-08-08 16:03 ` [PATCH 03/12] gpu: imx: simplify sync polarity setting Russell King 2015-08-08 16:03 ` Russell King 2015-10-06 17:57 ` Fabio Estevam 2015-10-06 17:57 ` Fabio Estevam 2015-10-06 17:57 ` Fabio Estevam 2015-08-08 16:03 ` [PATCH 04/12] gpu: imx: fix support for interlaced modes Russell King 2015-08-08 16:03 ` Russell King 2015-08-27 8:39 ` Philipp Zabel 2015-08-27 8:39 ` Philipp Zabel 2015-08-27 8:39 ` Philipp Zabel 2015-08-27 8:54 ` Russell King - ARM Linux 2015-08-27 8:54 ` Russell King - ARM Linux 2015-08-27 8:54 ` Russell King - ARM Linux 2015-08-27 9:40 ` Philipp Zabel 2015-08-27 9:40 ` Philipp Zabel 2015-08-27 9:40 ` Philipp Zabel 2015-10-06 17:59 ` Fabio Estevam 2015-10-06 17:59 ` Fabio Estevam 2015-10-06 17:59 ` Fabio Estevam 2015-08-08 16:03 ` [PATCH 05/12] drm: bridge/dw_hdmi: add support for interlaced video modes Russell King 2015-08-08 16:03 ` Russell King 2015-08-08 16:03 ` Russell King 2015-10-06 18:00 ` Fabio Estevam 2015-10-06 18:00 ` Fabio Estevam 2015-10-06 18:00 ` Fabio Estevam 2015-08-08 16:03 ` [PATCH 06/12] drm: bridge/dw_hdmi: clean up HDMI vs DVI mode handling Russell King 2015-08-08 16:03 ` Russell King 2015-10-07 3:40 ` Yakir Yang 2015-10-07 3:40 ` Yakir Yang 2015-10-07 3:40 ` Yakir Yang 2015-08-08 16:03 ` [PATCH 07/12] drm: bridge/dw_hdmi: enable audio only if sink supports audio Russell King 2015-08-08 16:03 ` Russell King 2015-10-07 3:42 ` Yakir Yang 2015-10-07 3:42 ` Yakir Yang 2015-10-07 3:42 ` Yakir Yang 2015-08-08 16:04 ` [PATCH 08/12] drm: bridge/dw_hdmi: avoid enabling interface in mode_set Russell King 2015-08-08 16:04 ` Russell King 2015-10-07 3:50 ` Yakir Yang 2015-10-07 3:50 ` Yakir Yang 2015-10-07 9:18 ` Russell King - ARM Linux 2015-10-07 9:18 ` Russell King - ARM Linux 2015-10-07 9:18 ` Russell King - ARM Linux 2015-10-07 9:35 ` Yakir Yang 2015-10-07 9:35 ` Yakir Yang 2015-10-07 9:35 ` Yakir Yang 2015-08-08 16:04 ` [PATCH 09/12] drm: bridge/dw_hdmi: rename dw_hdmi_phy_enable_power() Russell King 2015-08-08 16:04 ` Russell King 2015-08-08 16:04 ` Russell King 2015-10-07 4:00 ` Yakir Yang 2015-08-08 16:04 ` [PATCH 10/12] drm: bridge/dw_hdmi: fix phy enable/disable handling Russell King 2015-08-08 16:04 ` Russell King 2015-08-08 16:04 ` Russell King 2015-10-07 4:05 ` Yakir Yang 2015-10-07 9:48 ` Russell King - ARM Linux 2015-10-07 9:48 ` Russell King - ARM Linux 2015-10-07 9:48 ` Russell King - ARM Linux 2015-10-07 10:40 ` Yakir Yang 2015-10-07 19:17 ` Russell King - ARM Linux 2015-10-07 19:17 ` Russell King - ARM Linux 2015-10-07 19:17 ` Russell King - ARM Linux 2015-10-08 8:35 ` Yakir Yang 2015-10-08 8:35 ` Yakir Yang 2015-10-08 8:35 ` Yakir Yang 2015-08-08 16:04 ` [PATCH 11/12] drm: bridge/dw_hdmi: add connector mode forcing Russell King 2015-08-08 16:04 ` Russell King 2015-08-08 16:04 ` Russell King 2015-10-06 18:01 ` Fabio Estevam 2015-10-06 18:01 ` Fabio Estevam 2015-10-06 18:01 ` Fabio Estevam 2015-08-08 16:04 ` [PATCH 12/12] drm: bridge/dw_hdmi: improve HDMI enable/disable handling Russell King 2015-08-08 16:04 ` Russell King 2015-10-06 18:03 ` Fabio Estevam 2015-10-06 18:03 ` Fabio Estevam 2015-10-06 18:03 ` Fabio Estevam 2015-08-08 16:09 ` [PATCH 0/9] dw-hdmi audio support Russell King - ARM Linux 2015-08-08 16:09 ` Russell King - ARM Linux 2015-08-08 16:09 ` Russell King - ARM Linux 2015-08-08 16:10 ` [PATCH 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-08-10 10:05 ` Takashi Iwai 2015-08-10 10:05 ` Takashi Iwai 2015-08-10 10:05 ` Takashi Iwai 2015-08-10 10:39 ` Russell King - ARM Linux 2015-08-10 10:39 ` Russell King - ARM Linux 2015-08-10 10:39 ` Russell King - ARM Linux 2015-08-10 12:23 ` Takashi Iwai 2015-08-10 12:23 ` Takashi Iwai 2015-08-10 12:23 ` Takashi Iwai 2015-08-10 16:49 ` Russell King - ARM Linux 2015-08-10 16:49 ` Russell King - ARM Linux 2015-08-10 16:49 ` Russell King - ARM Linux 2015-08-10 18:16 ` Mark Brown 2015-08-10 18:16 ` Mark Brown 2015-08-14 13:54 ` [PATCH v2 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver David Airlie <airlied@linux.ie>, Sascha Hauer <s.hauer@pengutronix.de>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Jaroslav Kysela <perex@perex.cz>, linux-rockchip@lists.infradead.org, Mark Brown <broonie@kernel.org>, Philipp Zabel <p.zabel@pengutronix.de>, Yakir Yang <ykk@rock-chips.com>, Andy Yan <andy.yan@rock-chips.com>, Jon Nettleton <jon.nettleton@gmail.com>, linux-arm-kernel@lists.infradead.org Russell King 2015-08-14 13:54 ` Russell King 2015-08-14 13:54 ` Russell King 2015-08-14 14:04 ` [PATCH v2 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver Russell King 2015-08-14 14:04 ` Russell King 2015-08-14 14:04 ` Russell King 2015-08-14 14:34 ` [alsa-devel] " Takashi Iwai 2015-08-14 14:34 ` Takashi Iwai 2015-08-14 14:34 ` Takashi Iwai 2015-10-06 18:07 ` [PATCH " Fabio Estevam 2015-10-06 18:07 ` Fabio Estevam 2015-10-06 18:07 ` Fabio Estevam 2015-10-06 18:18 ` Russell King - ARM Linux 2015-10-06 18:18 ` Russell King - ARM Linux 2015-10-06 18:18 ` Russell King - ARM Linux 2015-10-06 18:45 ` Fabio Estevam 2015-10-06 18:45 ` Fabio Estevam 2015-10-06 18:45 ` Fabio Estevam 2015-10-06 18:54 ` Russell King - ARM Linux 2015-10-06 18:54 ` Russell King - ARM Linux 2015-10-06 18:54 ` Russell King - ARM Linux 2015-10-06 20:25 ` Fabio Estevam 2015-10-06 20:25 ` Fabio Estevam 2015-10-06 20:25 ` Fabio Estevam 2015-10-09 16:00 ` Russell King - ARM Linux 2015-10-09 16:00 ` Russell King - ARM Linux 2015-10-09 16:00 ` Russell King - ARM Linux 2015-10-09 16:02 ` Fabio Estevam 2015-10-09 16:02 ` Fabio Estevam 2015-10-09 16:02 ` Fabio Estevam 2015-10-09 16:11 ` Russell King - ARM Linux 2015-10-09 16:11 ` Russell King - ARM Linux 2015-10-09 16:11 ` Russell King - ARM Linux 2015-08-08 16:10 ` [PATCH 2/9] drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` [PATCH 3/9] drm: bridge/dw_hdmi-ahb-audio: basic support for multi-channel PCM audio Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` [PATCH 4/9] drm: bridge/dw_hdmi-ahb-audio: allow larger buffer sizes Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` [PATCH 5/9] drm: bridge/dw_hdmi: avoid being recursive in N calculation Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-09-04 17:50 ` Doug Anderson 2015-09-04 17:50 ` Doug Anderson 2015-09-04 17:50 ` Doug Anderson 2015-08-08 16:10 ` [PATCH 6/9] drm: bridge/dw_hdmi: adjust pixel clock values " Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-09-04 18:21 ` Doug Anderson 2015-09-04 18:21 ` Doug Anderson 2015-09-04 18:21 ` Doug Anderson 2015-09-04 19:48 ` Doug Anderson 2015-09-04 19:48 ` Doug Anderson 2015-09-04 19:48 ` Doug Anderson 2015-09-04 21:24 ` Russell King - ARM Linux 2015-09-04 21:24 ` Russell King - ARM Linux 2015-09-04 21:24 ` Russell King - ARM Linux 2015-09-04 23:50 ` Doug Anderson 2015-09-04 23:50 ` Doug Anderson 2015-09-04 23:50 ` Doug Anderson 2015-09-05 0:27 ` Russell King - ARM Linux 2015-09-05 0:27 ` Russell King - ARM Linux 2015-09-05 0:27 ` Russell King - ARM Linux 2015-09-05 2:03 ` Doug Anderson 2015-09-05 2:03 ` Doug Anderson 2015-09-05 2:03 ` Doug Anderson 2015-09-05 8:31 ` Russell King - ARM Linux 2015-09-05 8:31 ` Russell King - ARM Linux 2015-09-05 8:31 ` Russell King - ARM Linux 2015-09-05 13:46 ` Doug Anderson 2015-09-05 13:46 ` Doug Anderson 2015-09-05 13:46 ` Doug Anderson 2015-09-05 14:01 ` Russell King - ARM Linux 2015-09-05 14:01 ` Russell King - ARM Linux 2015-09-05 14:01 ` Russell King - ARM Linux 2015-09-05 19:44 ` Doug Anderson 2015-09-05 19:44 ` Doug Anderson 2015-09-05 19:44 ` Doug Anderson 2015-09-05 8:34 ` Russell King - ARM Linux 2015-09-05 8:34 ` Russell King - ARM Linux 2015-09-05 8:34 ` Russell King - ARM Linux 2015-09-05 13:50 ` Doug Anderson 2015-09-05 13:50 ` Doug Anderson 2015-09-05 13:50 ` Doug Anderson 2015-08-08 16:10 ` [PATCH 7/9] drm: bridge/dw_hdmi: remove ratio support from ACR code Russell King 2015-08-08 16:10 ` Russell King 2015-08-08 16:10 ` Russell King 2015-09-04 18:24 ` Doug Anderson 2015-09-04 18:24 ` Doug Anderson 2015-09-04 18:24 ` Doug Anderson 2015-08-08 16:10 ` Russell King [this message] 2015-08-08 16:10 ` [PATCH 8/9] drm: bridge/dw_hdmi: replace CTS calculation for the ACR Russell King 2015-09-04 20:00 ` Doug Anderson 2015-09-04 20:00 ` Doug Anderson 2015-09-04 20:00 ` Doug Anderson 2015-08-08 16:10 ` [PATCH 9/9] drm: bridge/dw_hdmi-i2s-audio: add audio driver Russell King 2015-08-08 16:10 ` Russell King 2015-08-10 15:48 ` Russell King - ARM Linux 2015-08-10 15:48 ` Russell King - ARM Linux 2015-08-10 15:48 ` Russell King - ARM Linux 2015-08-10 16:26 ` Yakir Yang 2015-08-10 16:26 ` Yakir Yang 2015-08-10 16:26 ` Yakir Yang 2015-08-27 8:42 ` [PATCH 0/9] dw-hdmi audio support Philipp Zabel 2015-08-27 8:42 ` Philipp Zabel 2015-08-27 8:42 ` Philipp Zabel 2016-01-05 15:40 ` [alsa-devel] " Jean-Michel Hautbois 2016-01-05 15:40 ` Jean-Michel Hautbois 2016-01-05 15:54 ` Fabio Estevam 2016-01-05 15:54 ` Fabio Estevam 2016-01-05 15:54 ` Fabio Estevam 2016-01-05 16:04 ` Russell King - ARM Linux 2016-01-05 16:04 ` Russell King - ARM Linux 2016-01-05 16:04 ` Russell King - ARM Linux 2016-01-07 8:21 ` Jean-Michel Hautbois 2016-01-07 8:21 ` Jean-Michel Hautbois 2016-01-07 8:21 ` Jean-Michel Hautbois 2015-08-10 12:21 ` [PATCH 00/12] dw-hdmi development Thierry Reding 2015-08-10 12:21 ` Thierry Reding 2015-08-10 12:21 ` Thierry Reding 2015-08-18 10:37 ` Russell King - ARM Linux 2015-08-18 10:37 ` Russell King - ARM Linux 2015-08-18 10:37 ` Russell King - ARM Linux
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