On 12/17/19 11:01 PM, Dmitry Osipenko wrote:
18.12.2019 09:59, Dmitry Osipenko пишет:
17.12.2019 23:04, Sowjanya Komatineni пишет:
mclk is from clk_out_1 which is part of Tegra PMC block and pmc clocks
are moved to Tegra PMC driver with pmc as clock provider and using pmc
clock ids.
New device tree uses clk_out_1 from pmc clock provider.
So, this patch adds implementation for mclk fallback to extern1 when
retrieving mclk returns -ENOENT to be backward compatible of new device
tree with older kernels.
Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
sound/soc/tegra/tegra_asoc_utils.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c
index fe9ca8acd0fb..1b88c6043082 100644
--- a/sound/soc/tegra/tegra_asoc_utils.c
+++ b/sound/soc/tegra/tegra_asoc_utils.c
@@ -191,7 +191,16 @@ int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
data->clk_cdev1 = devm_clk_get(dev, "mclk");
if (IS_ERR(data->clk_cdev1)) {
dev_err(data->dev, "Can't retrieve clk cdev1\n");
- return PTR_ERR(data->clk_cdev1);
+ if (PTR_ERR(data->clk_cdev1) != -ENOENT)
+ return PTR_ERR(data->clk_cdev1);
+ /* Fall back to extern1 */
+ data->clk_cdev1 = devm_clk_get(dev, "extern1");
+ if (IS_ERR(data->clk_cdev1)) {
+ dev_err(data->dev, "Can't retrieve clk extern1\n");
+ return PTR_ERR(data->clk_cdev1);
+ }
+
+ dev_err(data->dev, "Falling back to extern1\n");
}
/*
[ 1.769091] ------------[ cut here ]------------
[ 1.769249] WARNING: CPU: 2 PID: 1 at drivers/clk/clk.c:954
clk_core_disable+0xa5/0x1d4
[ 1.769330] clk_out_1 already disabled
[ 1.769459] Modules linked in:
[ 1.769541] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
5.5.0-rc1-next-20191213-00167-g6b9fbcdac8f3-dirty #266
[ 1.769676] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
[ 1.769775] [<c010e4bd>] (unwind_backtrace) from [<c010a0fd>]
(show_stack+0x11/0x14)
[ 1.769918] [<c010a0fd>] (show_stack) from [<c09a37b1>]
(dump_stack+0x85/0x94)
[ 1.770061] [<c09a37b1>] (dump_stack) from [<c011f3d1>]
(__warn+0xc1/0xc4)
[ 1.770144] [<c011f3d1>] (__warn) from [<c011f691>]
(warn_slowpath_fmt+0x61/0x78)
[ 1.770285] [<c011f691>] (warn_slowpath_fmt) from [<c04a0e7d>]
(clk_core_disable+0xa5/0x1d4)
[ 1.770427] [<c04a0e7d>] (clk_core_disable) from [<c04a0fc3>]
(clk_core_disable_lock+0x17/0x20)
[ 1.770516] [<c04a0fc3>] (clk_core_disable_lock) from [<c07792bb>]
(tegra_asoc_utils_set_rate+0x53/0x208)
[ 1.770662] [<c07792bb>] (tegra_asoc_utils_set_rate) from
[<c077b8c5>] (tegra_rt5640_probe+0xd5/0x128)
[ 1.770808] [<c077b8c5>] (tegra_rt5640_probe) from [<c0555eb7>]
(platform_drv_probe+0x33/0x68)
[ 1.770958] [<c0555eb7>] (platform_drv_probe) from [<c055471d>]
(really_probe+0x14d/0x240)
[ 1.771099] [<c055471d>] (really_probe) from [<c055493f>]
(driver_probe_device+0x43/0x11c)
[ 1.771187] [<c055493f>] (driver_probe_device) from [<c0554b25>]
(device_driver_attach+0x3d/0x40)
[ 1.771328] [<c0554b25>] (device_driver_attach) from [<c0554b5f>]
(__driver_attach+0x37/0x78)
[ 1.771469] [<c0554b5f>] (__driver_attach) from [<c05532fb>]
(bus_for_each_dev+0x43/0x6c)
[ 1.771609] [<c05532fb>] (bus_for_each_dev) from [<c0553e0f>]
(bus_add_driver+0xe3/0x148)
[ 1.771692] [<c0553e0f>] (bus_add_driver) from [<c055531d>]
(driver_register+0x39/0xa0)
[ 1.771833] [<c055531d>] (driver_register) from [<c0102c2f>]
(do_one_initcall+0x43/0x1bc)
[ 1.771979] [<c0102c2f>] (do_one_initcall) from [<c1000ce5>]
(kernel_init_freeable+0x121/0x194)
[ 1.772129] [<c1000ce5>] (kernel_init_freeable) from [<c09b40e9>]
(kernel_init+0xd/0xd0)
[ 1.772215] [<c09b40e9>] (kernel_init) from [<c01010bd>]
(ret_from_fork+0x11/0x34)
[ 1.772349] Exception stack(0xde907fb0 to 0xde907ff8)
Although, that's probably related to the "ASoC: tegra: Add initial
parent configuration for audio mclk".
Actually I see these warnings of already unprepared and already disabled
for pll_a, pll_a_out0, and clk_out_1 even without this whole patch
series as well.
I think its from tegra_asoc_utils_set_rate() doing clk_disable_unprepare
and these clocks are already unprepared and disabled so its just warning
from clk_core_unprepare and clk_core_disable.
