drm: bridge/dw_hdmi: introduce interface to setting sample rate
Introduce dw_hdmi_set_sample_rate(), which allows us to configure the
audio sample rate, setting the CTS/N values appropriately.
Tested-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index eeb0169..0ed8c49 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -365,6 +365,16 @@
mutex_unlock(&hdmi->audio_mutex);
}
+void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
+{
+ mutex_lock(&hdmi->audio_mutex);
+ hdmi->sample_rate = rate;
+ hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
+ hdmi->sample_rate, hdmi->ratio);
+ mutex_unlock(&hdmi->audio_mutex);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);
+
/*
* this submodule is responsible for the video data synchronization.
* for example, for RGB 4:4:4 input, the data map is defined as
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index de13bfc..763af51 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -12,6 +12,8 @@
#include <drm/drmP.h>
+struct dw_hdmi;
+
enum {
DW_HDMI_RES_8,
DW_HDMI_RES_10,
@@ -59,4 +61,7 @@
void *data, struct drm_encoder *encoder,
struct resource *iores, int irq,
const struct dw_hdmi_plat_data *plat_data);
+
+void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
+
#endif /* __IMX_HDMI_H__ */