mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-27 04:47:05 +00:00
Code Issues Releases Wiki Activity

drm: bridge/dw_hdmi: remove ratio support from ACR code

Browse source 
We never set the ratio for CTS/N calculation for the audio clock
regenerator (ACR) to anything but 100, so this adds pointless
complexity.  Should we support pixel repetition, we should update the
CTS/N calculation code to use those parameters or the actual TMDS clock
rate instead of a ratio.

Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2015-07-22 11:28:16 +01:00
parent 426701d0cc
commit b195fbdbdf
1 changed files with 18 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
drivers/gpu/drm/bridge/dw_hdmi.c
View file

@ -140,7 +140,6 @@ struct dw_hdmi {
unsigned int audio_cts;
unsigned int audio_n;
bool audio_enable;
int ratio;
void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
u8 (*read)(struct dw_hdmi *hdmi, int offset);
@ -217,8 +216,7 @@ static void hdmi_set_cts_n(struct dw_hdmi *hdmi, unsigned int cts,
hdmi_writeb(hdmi, n & 0xff, HDMI_AUD_N1);
}
static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
unsigned int ratio)
static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
{
unsigned int n = (128 * freq) / 1000;
unsigned int mult = 1;
@ -231,9 +229,9 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
switch (freq) {
case 32000:
if (pixel_clk == 25175000)
n = (ratio == 150) ? 9152 : 4576;
n = 4576;
else if (pixel_clk == 27027000)
n = (ratio == 150) ? 8192 : 4096;
n = 4096;
else if (pixel_clk == 74176000 || pixel_clk == 148352000)
n = 11648;
else
@ -247,7 +245,7 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
else if (pixel_clk == 74176000)
n = 17836;
else if (pixel_clk == 148352000)
n = (ratio == 150) ? 17836 : 8918;
n = 8918;
else
n = 6272;
n *= mult;
@ -255,13 +253,13 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
case 48000:
if (pixel_clk == 25175000)
n = (ratio == 150) ? 9152 : 6864;
n = 6864;
else if (pixel_clk == 27027000)
n = (ratio == 150) ? 8192 : 6144;
n = 6144;
else if (pixel_clk == 74176000)
n = 11648;
else if (pixel_clk == 148352000)
n = (ratio == 150) ? 11648 : 5824;
n = 5824;
else
n = 6144;
n *= mult;
@ -274,13 +272,11 @@ 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 ratio)
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 ratio: %d\n", __func__, freq,
pixel_clk, ratio);
pr_debug("%s: freq: %d pixel_clk: %ld\n", __func__, freq, pixel_clk);
switch (freq) {
case 32000:
@ -341,26 +337,24 @@ static unsigned int hdmi_compute_cts(unsigned int freq, unsigned long pixel_clk,
default:
break;
}
if (ratio == 100)
return cts;
return (cts * ratio) / 100;
return cts;
}
static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
unsigned long pixel_clk, unsigned int sample_rate, unsigned int ratio)
unsigned long pixel_clk, unsigned int sample_rate)
{
unsigned int n, cts;
n = hdmi_compute_n(sample_rate, pixel_clk, ratio);
cts = hdmi_compute_cts(sample_rate, pixel_clk, ratio);
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 ratio=%d pixelclk=%luMHz N=%d cts=%d\n",
__func__, sample_rate, ratio, pixel_clk, n, cts);
dev_dbg(hdmi->dev, "%s: samplerate=%ukHz pixelclk=%luMHz N=%d cts=%d\n",
__func__, sample_rate, pixel_clk, n, cts);
spin_lock_irq(&hdmi->audio_lock);
hdmi->audio_n = n;
@ -372,8 +366,7 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi)
{
mutex_lock(&hdmi->audio_mutex);
hdmi_set_clk_regenerator(hdmi, 74250000, hdmi->sample_rate,
hdmi->ratio);
hdmi_set_clk_regenerator(hdmi, 74250000, hdmi->sample_rate);
mutex_unlock(&hdmi->audio_mutex);
}
@ -381,7 +374,7 @@ static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
{
mutex_lock(&hdmi->audio_mutex);
hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
hdmi->sample_rate, hdmi->ratio);
hdmi->sample_rate);
mutex_unlock(&hdmi->audio_mutex);
}
@ -390,7 +383,7 @@ 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);
hdmi->sample_rate);
mutex_unlock(&hdmi->audio_mutex);
}
EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);
@ -1746,7 +1739,6 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
hdmi->dev = dev;
hdmi->dev_type = plat_data->dev_type;
hdmi->sample_rate = 48000;
hdmi->ratio = 100;
hdmi->encoder = encoder;
hdmi->disabled = true;
hdmi->rxsense = true;