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authorDaisuke Nojiri <dnojiri@chromium.org>2014-03-26 15:04:10 -0700
committerMarc Jones <marc.jones@se-eng.com>2014-11-14 07:27:42 +0100
commit14ade701bd6efd396d4caf641e974c564f07c838 (patch)
tree3c6e434a00c267ab4cfe23f0bc9b81f83e45623f /src/mainboard/google/nyan
parent4a12cfe759500e31200ec92677992038f10915ac (diff)
downloadcoreboot-14ade701bd6efd396d4caf641e974c564f07c838.tar.xz
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>
Diffstat (limited to 'src/mainboard/google/nyan')
-rw-r--r--src/mainboard/google/nyan/mainboard.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/mainboard/google/nyan/mainboard.c b/src/mainboard/google/nyan/mainboard.c
index dbca03ccae..a96236bcfa 100644
--- a/src/mainboard/google/nyan/mainboard.c
+++ b/src/mainboard/google/nyan/mainboard.c
@@ -53,10 +53,11 @@ static void set_clock_sources(void)
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);