OMAP3630: Clock: Workaround for DPLL HS divider limitation
This patch implements a workaround for the DPLL HS divider limitation
in OMAP3630 as given by Errata ID: i556.
Errata:
When PWRDN bit is set, it resets the internal HSDIVIDER divide-by value (Mx).
The reset value gets loaded instead of the previous value.
The following HSDIVIDERs exhibit above behavior:
. DPLL4 : M6 / M5 / M4 / M3 / M2 (CM_CLKEN_PLL[31:26] register bits)
. DPLL3 : M3 (CM_CLKEN_PLL[12] register bit).
Work Around:
It is mandatory to apply the following sequence to ensure the write
value will
be loaded in DPLL HSDIVIDER FSM:
The global sequence when using PWRDN bit is the following:
. Disable Mx HSDIVIDER clock output related functional clock enable bits
(in CM_FCLKEN_xxx / CM_ICLKEN_xxx)
. Enable PWRDN bit of HSDIVIDER
. Disable PWRDN bit of HSDIVIDER
. Read current HSDIVIDER register value
. Write different value in HSDIVIDER register
. Write expected value in HSDIVIDER register
. Enable Mx HSDIVIDER clock output related functional clocks
(CM_FCLKEN_xxx / CM_ICLKEN_xxx)
Signed-off-by: Mike Turquette <mturquette@ti.com>
Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Vijaykumar GN <vijaykumar.gn@ti.com>
[paul@pwsan.com: updated patch to apply; made workaround function static;
marked as being 36xx-specific]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/mach-omap2/clock34xx_data.c b/arch/arm/mach-omap2/clock34xx_data.c
index 221e831..8bb8134 100644
--- a/arch/arm/mach-omap2/clock34xx_data.c
+++ b/arch/arm/mach-omap2/clock34xx_data.c
@@ -3358,6 +3358,25 @@
}
}
+ if (cpu_is_omap3630()) {
+ /*
+ * For 3630: override clkops_omap2_dflt_wait for the
+ * clocks affected from PWRDN reset Limitation
+ */
+ dpll3_m3x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ dpll4_m2x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ dpll4_m3x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ dpll4_m4x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ dpll4_m5x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ dpll4_m6x2_ck.ops =
+ &clkops_omap36xx_pwrdn_with_hsdiv_wait_restore;
+ }
+
clk_init(&omap2_clk_functions);
for (c = omap3xxx_clks; c < omap3xxx_clks + ARRAY_SIZE(omap3xxx_clks); c++)