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authorSlava Grigorev <slava.grigorev@amd.com>2014-12-07 04:19:16 +0300
committerAlex Deucher <alexander.deucher@amd.com>2015-01-22 18:42:11 +0300
commit64424d6e45aeee311a4231def7e125bcc2de0855 (patch)
treef7a6692f1f20070df377435c352cd2cd5e60cc48 /drivers/gpu/drm/radeon/radeon_audio.c
parent96ea7afbc256ce7e2b2446909f52dab357942c3c (diff)
downloadlinux-64424d6e45aeee311a4231def7e125bcc2de0855.tar.xz
radeon/audio: consolidate update_acr() functions (v2)
V2: fix missing dce6 callback Signed-off-by: Slava Grigorev <slava.grigorev@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_audio.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_audio.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c
index cc58ee8c7d2f..dbb3c594e9ae 100644
--- a/drivers/gpu/drm/radeon/radeon_audio.c
+++ b/drivers/gpu/drm/radeon/radeon_audio.c
@@ -22,6 +22,7 @@
* Authors: Slava Grigorev <slava.grigorev@amd.com>
*/
+#include <linux/gcd.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include "radeon.h"
@@ -78,6 +79,12 @@ void r600_update_avi_infoframe(struct radeon_device *rdev, u32 offset,
unsigned char *buffer, size_t size);
void evergreen_update_avi_infoframe(struct radeon_device *rdev, u32 offset,
unsigned char *buffer, size_t size);
+void r600_hdmi_update_acr(struct drm_encoder *encoder, long offset,
+ const struct radeon_hdmi_acr *acr);
+void dce3_2_hdmi_update_acr(struct drm_encoder *encoder, long offset,
+ const struct radeon_hdmi_acr *acr);
+void evergreen_hdmi_update_acr(struct drm_encoder *encoder, long offset,
+ const struct radeon_hdmi_acr *acr);
static const u32 pin_offsets[7] =
{
@@ -132,6 +139,7 @@ static struct radeon_audio_basic_funcs dce6_funcs = {
static struct radeon_audio_funcs r600_hdmi_funcs = {
.get_pin = r600_audio_get_pin,
.set_dto = r600_hdmi_audio_set_dto,
+ .update_acr = r600_hdmi_update_acr,
};
static struct radeon_audio_funcs dce32_hdmi_funcs = {
@@ -139,6 +147,7 @@ static struct radeon_audio_funcs dce32_hdmi_funcs = {
.write_sad_regs = dce3_2_afmt_write_sad_regs,
.write_speaker_allocation = dce3_2_afmt_hdmi_write_speaker_allocation,
.set_dto = dce3_2_audio_set_dto,
+ .update_acr = dce3_2_hdmi_update_acr,
};
static struct radeon_audio_funcs dce32_dp_funcs = {
@@ -154,6 +163,7 @@ static struct radeon_audio_funcs dce4_hdmi_funcs = {
.write_speaker_allocation = dce4_afmt_hdmi_write_speaker_allocation,
.write_latency_fields = dce4_afmt_write_latency_fields,
.set_dto = dce4_hdmi_audio_set_dto,
+ .update_acr = evergreen_hdmi_update_acr,
};
static struct radeon_audio_funcs dce4_dp_funcs = {
@@ -171,6 +181,7 @@ static struct radeon_audio_funcs dce6_hdmi_funcs = {
.write_speaker_allocation = dce6_afmt_hdmi_write_speaker_allocation,
.write_latency_fields = dce6_afmt_write_latency_fields,
.set_dto = dce6_hdmi_audio_set_dto,
+ .update_acr = evergreen_hdmi_update_acr,
};
static struct radeon_audio_funcs dce6_dp_funcs = {
@@ -456,3 +467,92 @@ void radeon_update_avi_infoframe(struct drm_encoder *encoder, void *buffer,
rdev->audio.funcs->update_avi_infoframe(rdev, dig->afmt->offset,
buffer, size);
}
+
+/*
+ * calculate CTS and N values if they are not found in the table
+ */
+static void radeon_audio_calc_cts(unsigned int clock, int *CTS, int *N, int freq)
+{
+ int n, cts;
+ unsigned long div, mul;
+
+ /* Safe, but overly large values */
+ n = 128 * freq;
+ cts = clock * 1000;
+
+ /* Smallest valid fraction */
+ div = gcd(n, cts);
+
+ n /= div;
+ cts /= div;
+
+ /*
+ * The optimal N is 128*freq/1000. Calculate the closest larger
+ * value that doesn't truncate any bits.
+ */
+ mul = ((128*freq/1000) + (n-1))/n;
+
+ n *= mul;
+ cts *= mul;
+
+ /* Check that we are in spec (not always possible) */
+ if (n < (128*freq/1500))
+ printk(KERN_WARNING "Calculated ACR N value is too small. You may experience audio problems.\n");
+ if (n > (128*freq/300))
+ printk(KERN_WARNING "Calculated ACR N value is too large. You may experience audio problems.\n");
+
+ *N = n;
+ *CTS = cts;
+
+ DRM_DEBUG("Calculated ACR timing N=%d CTS=%d for frequency %d\n",
+ *N, *CTS, freq);
+}
+
+static const struct radeon_hdmi_acr* radeon_audio_acr(unsigned int clock)
+{
+ static struct radeon_hdmi_acr res;
+ u8 i;
+
+ static const struct radeon_hdmi_acr hdmi_predefined_acr[] = {
+ /* 32kHz 44.1kHz 48kHz */
+ /* Clock N CTS N CTS N CTS */
+ { 25175, 4096, 25175, 28224, 125875, 6144, 25175 }, /* 25,20/1.001 MHz */
+ { 25200, 4096, 25200, 6272, 28000, 6144, 25200 }, /* 25.20 MHz */
+ { 27000, 4096, 27000, 6272, 30000, 6144, 27000 }, /* 27.00 MHz */
+ { 27027, 4096, 27027, 6272, 30030, 6144, 27027 }, /* 27.00*1.001 MHz */
+ { 54000, 4096, 54000, 6272, 60000, 6144, 54000 }, /* 54.00 MHz */
+ { 54054, 4096, 54054, 6272, 60060, 6144, 54054 }, /* 54.00*1.001 MHz */
+ { 74176, 4096, 74176, 5733, 75335, 6144, 74176 }, /* 74.25/1.001 MHz */
+ { 74250, 4096, 74250, 6272, 82500, 6144, 74250 }, /* 74.25 MHz */
+ { 148352, 4096, 148352, 5733, 150670, 6144, 148352 }, /* 148.50/1.001 MHz */
+ { 148500, 4096, 148500, 6272, 165000, 6144, 148500 }, /* 148.50 MHz */
+ };
+
+ /* Precalculated values for common clocks */
+ for (i = 0; i < ARRAY_SIZE(hdmi_predefined_acr); i++)
+ if (hdmi_predefined_acr[i].clock == clock)
+ return &hdmi_predefined_acr[i];
+
+ /* And odd clocks get manually calculated */
+ radeon_audio_calc_cts(clock, &res.cts_32khz, &res.n_32khz, 32000);
+ radeon_audio_calc_cts(clock, &res.cts_44_1khz, &res.n_44_1khz, 44100);
+ radeon_audio_calc_cts(clock, &res.cts_48khz, &res.n_48khz, 48000);
+
+ return &res;
+}
+
+/*
+ * update the N and CTS parameters for a given pixel clock rate
+ */
+void radeon_audio_update_acr(struct drm_encoder *encoder, unsigned int clock)
+{
+ const struct radeon_hdmi_acr *acr = radeon_audio_acr(clock);
+ struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+ struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+
+ if (!dig || !dig->afmt)
+ return;
+
+ if (radeon_encoder->audio && radeon_encoder->audio->update_acr)
+ radeon_encoder->audio->update_acr(encoder, dig->afmt->offset, acr);
+}