On 04/07/2017 04:19 PM, Romain Perier wrote:
> Currently, CTS+N is forced to zero as a workaround of the IP block for
> i.MX platforms. This is requested in the datasheet of the corresponding
> IP for AHB mode only. However, we have seen that it introduces glitches
> or delays when playing a sound on HDMI for I2S mode. This proves that we
> cannot keep the current functions for handling audio stream as-is if
> these contain workaround that are specific to a mode.
>
> This commit introduces two callbacks, one for each variant.
> dw_hdmi_setup defines the right function depending on the detected
> variant. Then, the exported functions dw_hdmi_audio_enable and
> dw_hdmi_audio_disable calls the corresponding callbacks
Thanks for the patch, I'll test it on the Amlogic platform.
>
> Signed-off-by: Romain Perier <romain.per...@collabora.com>
> ---
> drivers/gpu/drm/bridge/dw-hdmi.c | 31 +++++++++++++++++++++++++++++--
> 1 file changed, 29 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c
> b/drivers/gpu/drm/bridge/dw-hdmi.c
> index 542d198..d34e0a5 100644
> --- a/drivers/gpu/drm/bridge/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/dw-hdmi.c
> @@ -166,6 +166,8 @@ struct dw_hdmi {
>
> void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
> u8 (*read)(struct dw_hdmi *hdmi, int offset);
> + void (*enable_audio)(struct dw_hdmi *hdmi);
> + void (*disable_audio)(struct dw_hdmi *hdmi);
> };
>
> #define HDMI_IH_PHY_STAT0_RX_SENSE \
> @@ -557,13 +559,34 @@ void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi,
> unsigned int rate)
> }
> EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);
>
> +void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
> +{
> + hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> +}
> +
> +void dw_hdmi_ahb_audio_disable(struct dw_hdmi *hdmi)
> +{
> + hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
> +}
> +
> +void dw_hdmi_i2s_audio_enable(struct dw_hdmi *hdmi)
> +{
> + hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> +}
> +
> +
> +void dw_hdmi_i2s_audio_disable(struct dw_hdmi *hdmi)
> +{
> +
> +}
For this one, it would be better to set it to NULL then check for NULL...
> +
> void dw_hdmi_audio_enable(struct dw_hdmi *hdmi)
> {
> unsigned long flags;
>
> spin_lock_irqsave(&hdmi->audio_lock, flags);
> hdmi->audio_enable = true;
> - hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
> + hdmi->enable_audio(hdmi);
if (hdmi->enable_audio)
hdmi->enable_audio(hdmi);
for consistency...
> spin_unlock_irqrestore(&hdmi->audio_lock, flags);
> }
> EXPORT_SYMBOL_GPL(dw_hdmi_audio_enable);
> @@ -574,7 +597,7 @@ void dw_hdmi_audio_disable(struct dw_hdmi *hdmi)
>
> spin_lock_irqsave(&hdmi->audio_lock, flags);
> hdmi->audio_enable = false;
> - hdmi_set_cts_n(hdmi, hdmi->audio_cts, 0);
> + hdmi->disable_audio(hdmi);
if (hdmi->disable_audio)
hdmi->disable_audio(hdmi);
> spin_unlock_irqrestore(&hdmi->audio_lock, flags);
> }
> EXPORT_SYMBOL_GPL(dw_hdmi_audio_disable);
> @@ -2114,6 +2137,8 @@ __dw_hdmi_probe(struct platform_device *pdev,
> audio.irq = irq;
> audio.hdmi = hdmi;
> audio.eld = hdmi->connector.eld;
> + hdmi->enable_audio = dw_hdmi_ahb_audio_enable;
> + hdmi->disable_audio = dw_hdmi_ahb_audio_disable;
>
> pdevinfo.name = "dw-hdmi-ahb-audio";
> pdevinfo.data = &audio;
> @@ -2126,6 +2151,8 @@ __dw_hdmi_probe(struct platform_device *pdev,
> audio.hdmi = hdmi;
> audio.write = hdmi_writeb;
> audio.read = hdmi_readb;
> + hdmi->enable_audio = dw_hdmi_i2s_audio_enable;
> + hdmi->disable_audio = dw_hdmi_i2s_audio_disable;
>
> pdevinfo.name = "dw-hdmi-i2s-audio";
> pdevinfo.data = &audio;
>
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
