diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2016-12-07 16:22:15 +0100 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2017-01-02 10:07:18 +0100 |
| commit | 5d45b011c14a791ef23555a59ff7a3e6d213530f (patch) | |
| tree | 370e161cb1df1c0d896839a4243dc68a611cfaa0 /arch/arm | |
| parent | Linux 4.10-rc2 (diff) | |
| download | linux-5d45b011c14a791ef23555a59ff7a3e6d213530f.tar.xz linux-5d45b011c14a791ef23555a59ff7a3e6d213530f.zip | |
ARM: davinci: da850: fix infinite loop in clk_set_rate()
The aemif clock is added twice to the lookup table in da850.c. This
breaks the children list of pll0_sysclk3 as we're using the same list
links in struct clk. When calling clk_set_rate(), we get stuck in
propagate_rate().
Create a separate clock for nand, inheriting the rate of the aemif
clock and retrieve it in the davinci_nand module.
Cc: <stable@vger.kernel.org> # 4.9.x
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-davinci/da850.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c index e770c97ea45c..e9d019cc8f46 100644 --- a/arch/arm/mach-davinci/da850.c +++ b/arch/arm/mach-davinci/da850.c @@ -367,6 +367,16 @@ static struct clk aemif_clk = { .flags = ALWAYS_ENABLED, }; +/* + * In order to avoid adding the aemif_clk to the clock lookup table twice (and + * screwing up the linked list in the process) create a separate clock for + * nand inheriting the rate from aemif_clk. + */ +static struct clk aemif_nand_clk = { + .name = "nand", + .parent = &aemif_clk, +}; + static struct clk usb11_clk = { .name = "usb11", .parent = &pll0_sysclk4, @@ -537,7 +547,15 @@ static struct clk_lookup da850_clks[] = { CLK("da830-mmc.0", NULL, &mmcsd0_clk), CLK("da830-mmc.1", NULL, &mmcsd1_clk), CLK("ti-aemif", NULL, &aemif_clk), - CLK(NULL, "aemif", &aemif_clk), + /* + * The only user of this clock is davinci_nand and it get's it through + * con_id. The nand node itself is created from within the aemif + * driver to guarantee that it's probed after the aemif timing + * parameters are configured. of_dev_auxdata is not accessible from + * the aemif driver and can't be passed to of_platform_populate(). For + * that reason we're leaving the dev_id here as NULL. + */ + CLK(NULL, "aemif", &aemif_nand_clk), CLK("ohci-da8xx", "usb11", &usb11_clk), CLK("musb-da8xx", "usb20", &usb20_clk), CLK("spi_davinci.0", NULL, &spi0_clk), |