On 04/14/2017 10:31 AM, 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
>
> Signed-off-by: Romain Perier <romain.per...@collabora.com>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 4b6f216..5b328c0 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -173,6 +173,8 @@ struct dw_hdmi {
>
> unsigned int reg_shift;
> struct regmap *regm;
> + void (*enable_audio)(struct dw_hdmi *hdmi);
> + void (*disable_audio)(struct dw_hdmi *hdmi);
> };
>
> #define HDMI_IH_PHY_STAT0_RX_SENSE \
> @@ -542,13 +544,29 @@ 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_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);
> + if (hdmi->enable_audio)
> + hdmi->enable_audio(hdmi);
> spin_unlock_irqrestore(&hdmi->audio_lock, flags);
> }
> EXPORT_SYMBOL_GPL(dw_hdmi_audio_enable);
> @@ -559,7 +577,8 @@ 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);
> + if (hdmi->disable_audio)
> + hdmi->disable_audio(hdmi);
> spin_unlock_irqrestore(&hdmi->audio_lock, flags);
> }
> EXPORT_SYMBOL_GPL(dw_hdmi_audio_disable);
> @@ -2404,6 +2423,8 @@ __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;
> @@ -2416,6 +2437,7 @@ __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;
>
> pdevinfo.name = "dw-hdmi-i2s-audio";
> pdevinfo.data = &audio;
>
Hi Romain,
Reviewed-by: Neil Armstrong <narmstr...@baylibre.com>
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