Nyan: Set I2S1 Source to CLK_M
This is required to send 1.5Mhz clock to Max98090 and get a right beep sound.
BUG=chrome-os-partner:26609
TEST=Booted Nyan. Verified Max98090 can beep. Measured frequency by smartphone.
BRANCH=none
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Change-Id: Ie3ff6df6759cb23d78dc05069553ddb4eb8e508a
Original-Reviewed-on: https://chromium-review.googlesource.com/191791
Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 2f75a147f26ac334fff174a1f9618a2bbe290fe9)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: If8c7871dc8202f98ccf23fb0afad1e7745fbf174
Reviewed-on: http://review.coreboot.org/7457
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
diff --git a/src/mainboard/google/nyan/mainboard.c b/src/mainboard/google/nyan/mainboard.c
index dbca03c..a96236b 100644
--- a/src/mainboard/google/nyan/mainboard.c
+++ b/src/mainboard/google/nyan/mainboard.c
@@ -53,10 +53,11 @@
clock_configure_irregular_source(extperiph1, CLK_M, 12000, 3);
/*
- * I2S1 can use either PLLP or PLLA. Using PLLP is sufficient now since
- * we only need 4.8MHz. Note the source id of PLLP for I2S is 4.
+ * We need 1.5MHz. So, we use CLK_M. CLK_DIVIDER macro returns a divisor
+ * (0xe) a little bit off from the ideal value (0xd) but it's good
+ * enough for beeps. The source id of CLK_M for I2S is 6.
*/
- clock_configure_irregular_source(i2s1, PLLP, 4800, 4);
+ clock_configure_irregular_source(i2s1, CLK_M, 1500, 6);
/* Note source id of PLLP for HOST1x is 4. */
clock_configure_irregular_source(host1x, PLLP, 408000, 4);