commit 9d0d8e47af7f243afe9f090caa4decb510a6d385
author Preetam Singh Ranawat <apranawat@codeaurora.org> Mon Jul 15 12:27:25 2019 +0530
committer Preetam Singh Ranawat <apranawat@codeaurora.org> Tue Jul 16 14:42:54 2019 +0530
tree ebeb7d559465002ef5c52e600e4a01aee47ae54f
parent 007e5e9cd5028f9890d5995a3621a01ad7dd6839

audio: limit sampling rates to 192Khz for WCD9380 varient.

 -WCD9380 supports sampling rates upto 192Khz, hence limit
  SR > 192Khz to 192Khz.

Change-Id: I1435919320d784bedf4147a9e467867d777b594b

hal/audio_extn/audio_extn.h

diff --git a/hal/audio_extn/audio_extn.h b/hal/audio_extn/audio_extn.h
index b7942ae..17e0720 100644
--- a/hal/audio_extn/audio_extn.h
+++ b/hal/audio_extn/audio_extn.h
@@ -854,6 +854,7 @@
 int b64encode(uint8_t *inp, int ilen, char* outp);
 int read_line_from_file(const char *path, char *buf, size_t count);
 int audio_extn_utils_get_codec_version(const char *snd_card_name, int card_num, char *codec_version);
+int audio_extn_utils_get_codec_variant(int card_num, char *codec_variant);
 audio_format_t alsa_format_to_hal(uint32_t alsa_format);
 uint32_t hal_format_to_alsa(audio_format_t hal_format);
 audio_format_t pcm_format_to_hal(uint32_t pcm_format);

hal/audio_extn/utils.c

diff --git a/hal/audio_extn/utils.c b/hal/audio_extn/utils.c
index d66b368..0ea7d94 100644
--- a/hal/audio_extn/utils.c
+++ b/hal/audio_extn/utils.c
@@ -1772,6 +1772,27 @@
     return 0;
 }
 
+int audio_extn_utils_get_codec_variant(int card_num,
+                            char *codec_variant)
+{
+    char procfs_path[50];
+    FILE *fp;
+    snprintf(procfs_path, sizeof(procfs_path),
+             "/proc/asound/card%d/codecs/wcd938x/variant", card_num);
+    if ((fp = fopen(procfs_path, "r")) == NULL) {
+        snprintf(procfs_path, sizeof(procfs_path),
+                 "/proc/asound/card%d/codecs/wcd937x/variant", card_num);
+        if ((fp = fopen(procfs_path, "r")) == NULL) {
+            ALOGE("%s: ERROR. cannot open %s", __func__, procfs_path);
+            return -ENOENT;
+        }
+    }
+    fgets(codec_variant, CODEC_VARIANT_MAX_LENGTH, fp);
+    fclose(fp);
+    ALOGD("%s: codec variant is %s", __func__, codec_variant);
+    return 0;
+}
+
 
 #ifdef AUDIO_EXTERNAL_HDMI_ENABLED
 

hal/msm8974/platform.c

diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 459c37c..aa32e38 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -333,6 +333,7 @@
     char ec_ref_mixer_path[MIXER_PATH_MAX_LENGTH];
     codec_backend_cfg_t current_backend_cfg[MAX_CODEC_BACKENDS];
     char codec_version[CODEC_VERSION_MAX_LENGTH];
+    char codec_variant[CODEC_VARIANT_MAX_LENGTH];
     int hw_dep_fd;
     char cvd_version[MAX_CVD_VERSION_STRING_SIZE];
     char snd_card_name[MAX_SND_CARD_STRING_SIZE];
@@ -3643,6 +3644,8 @@
         }
     }
 
+    ret = audio_extn_utils_get_codec_variant(my_data->adev->snd_card,
+                                             my_data->codec_variant);
     ret = audio_extn_utils_get_codec_version(snd_card_name,
                                              my_data->adev->snd_card,
                                              my_data->codec_version);
@@ -8534,6 +8537,21 @@
                         sample_rate = curr_out->sample_rate;
                     }
                 }
+
+                /* WCD9380 support SR upto 192Khz only, hence reset
+                 * SR > 192Khz to 192Khz.
+                 */
+                if (strstr(my_data->codec_variant, "WCD9380")) {
+                    switch (sample_rate) {
+                        case 352800:
+                        case 384000:
+                            sample_rate = 192000;
+                            ALOGD("%s:Reset Sampling rate to %d",  __func__, sample_rate);
+                            break;
+                        default:
+                            break;
+                    }
+                }
             }
         } else if (na_mode != NATIVE_AUDIO_MODE_MULTIPLE_MIX_IN_CODEC) {
             /*

hal/msm8974/platform.h

diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index 1d56a7e..0274b21 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -372,6 +372,7 @@
 #define DEFAULT_VOLUME_RAMP_DURATION_MS 20
 #define MIXER_PATH_MAX_LENGTH 100
 #define CODEC_VERSION_MAX_LENGTH 100
+#define CODEC_VARIANT_MAX_LENGTH 100
 
 #define MAX_VOL_INDEX 5
 #define MIN_VOL_INDEX 0