diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-11-07 16:01:45 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-10-09 17:14:12 +0100 |
| commit | 7ed6c665e19d4c0456d01c01147e82563c482c4d (patch) | |
| tree | ed6bb0a14799b8161e45ddc97cf2cce5032b5f45 /drivers/gpu/drm/bridge/dw_hdmi.c | |
| parent | aeac23bda87fd98049352d3bc27a1cb80445e7a0 (diff) | |
drm: bridge/dw_hdmi-ahb-audio: add audio driver
Add ALSA based HDMI AHB audio driver for dw_hdmi. The only buffer
format supported by the hardware is its own special IEC958 based format,
which is not compatible with any ALSA format. To avoid doing too much
data manipulation within the driver, we support only ALSAs IEC958 LE and
24-bit PCM formats for 2 to 6 channels, which we convert to its hardware
format.
A more desirable solution would be to have this conversion in userspace,
but ALSA does not appear to allow such transformations outside of
libasound itself.
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/gpu/drm/bridge/dw_hdmi.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/dw_hdmi.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c index 7a130f6fdb3d..d61a9fb46c6d 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.c +++ b/drivers/gpu/drm/bridge/dw_hdmi.c @@ -28,6 +28,7 @@ #include <drm/bridge/dw_hdmi.h> #include "dw_hdmi.h" +#include "dw_hdmi-audio.h" #define HDMI_EDID_LEN 512 @@ -104,6 +105,7 @@ struct dw_hdmi { struct drm_encoder *encoder; struct drm_bridge *bridge; + struct platform_device *audio; enum dw_hdmi_devtype dev_type; struct device *dev; struct clk *isfr_clk; @@ -1732,7 +1734,9 @@ int dw_hdmi_bind(struct device *dev, struct device *master, { struct drm_device *drm = data; struct device_node *np = dev->of_node; + struct platform_device_info pdevinfo; struct device_node *ddc_node; + struct dw_hdmi_audio_data audio; struct dw_hdmi *hdmi; int ret; u32 val = 1; @@ -1860,6 +1864,23 @@ int dw_hdmi_bind(struct device *dev, struct device *master, hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE), HDMI_IH_MUTE_PHY_STAT0); + memset(&pdevinfo, 0, sizeof(pdevinfo)); + pdevinfo.parent = dev; + pdevinfo.id = PLATFORM_DEVID_AUTO; + + if (hdmi_readb(hdmi, HDMI_CONFIG1_ID) & HDMI_CONFIG1_AHB) { + audio.phys = iores->start; + audio.base = hdmi->regs; + audio.irq = irq; + audio.hdmi = hdmi; + + pdevinfo.name = "dw-hdmi-ahb-audio"; + pdevinfo.data = &audio; + pdevinfo.size_data = sizeof(audio); + pdevinfo.dma_mask = DMA_BIT_MASK(32); + hdmi->audio = platform_device_register_full(&pdevinfo); + } + dev_set_drvdata(dev, hdmi); return 0; @@ -1877,6 +1898,9 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data) { struct dw_hdmi *hdmi = dev_get_drvdata(dev); + if (hdmi->audio && !IS_ERR(hdmi->audio)) + platform_device_unregister(hdmi->audio); + /* Disable all interrupts */ hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0); |