mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-29 20:30:35 +00:00
OMAP2/3: clock: fix fint calculation for DPLL_FREQSEL
In OMAP35X TRM Rev 2010-05 Figure 7-18 "DPLL With EMI Reduction Feature", it is shown that the internal frequency is calculated by CLK_IN/(N+1). However, the value passed to _dpll_test_fint() is already "N+1" since Linux is using the values to divide by. In the technical reference manual, "N" is referring to the divider's register value (0-127). During power management testing, it was observed that programming the wrong jitter correction value can cause the system to become unstable and eventually crash. Signed-off-by: John Ogness <john.ogness@linutronix.de> [paul@pwsan.com: added second paragraph to commit message] Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
parent
f5412be599
commit
ea68c00e26
1 changed files with 1 additions and 1 deletions
|
@ -77,7 +77,7 @@ static int _dpll_test_fint(struct clk *clk, u8 n)
|
|||
dd = clk->dpll_data;
|
||||
|
||||
/* DPLL divider must result in a valid jitter correction val */
|
||||
fint = clk->parent->rate / (n + 1);
|
||||
fint = clk->parent->rate / n;
|
||||
if (fint < DPLL_FINT_BAND1_MIN) {
|
||||
|
||||
pr_debug("rejecting n=%d due to Fint failure, "
|
||||
|
|
Loading…
Reference in a new issue