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clk: sunxi-ng: h6-r: Fix AR100/R_APB2 parent order

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According to the BSP source code, both the AR100 and R_APB2 clocks have
PLL_PERIPH0 as mux index 3, not 2 as it was on previous chips. The pre-
divider used for PLL_PERIPH0 should be changed to index 3 to match.

This was verified by running a rough benchmark on the AR100 with various
clock settings:

        | mux | pre-divider | iterations/second | clock source |
        |=====|=============|===================|==============|
        |   0 |           0 |  19033   (stable) |       osc24M |
        |   2 |           5 |  11466 (unstable) |  iosc/osc16M |
        |   2 |          17 |  11422 (unstable) |  iosc/osc16M |
        |   3 |           5 |  85338   (stable) |  pll-periph0 |
        |   3 |          17 |  27167   (stable) |  pll-periph0 |

The relative performance numbers all match up (with pll-periph0 running
at its default 600MHz).

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Samuel Holland 2019-12-28 20:59:22 -06:00 committed by Maxime Ripard
parent 675a6d467b
commit 0c545240ae
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1 changed files with 2 additions and 2 deletions
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4
drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
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@ -23,9 +23,9 @@
*/
static const char * const ar100_r_apb2_parents[] = { "osc24M", "osc32k",
"pll-periph0", "iosc" };
"iosc", "pll-periph0" };
static const struct ccu_mux_var_prediv ar100_r_apb2_predivs[] = {
{ .index = 2, .shift = 0, .width = 5 },
{ .index = 3, .shift = 0, .width = 5 },
};
static struct ccu_div ar100_clk = {