diff options
| author | Philipp Zabel <p.zabel@pengutronix.de> | 2016-10-18 03:29:13 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2016-11-01 15:55:27 +0300 |
| commit | 03d576f202e8cd40d500aa4f7594ad702d861096 (patch) | |
| tree | 945b5b305988c14b203634eaebd560832d878527 /drivers/clk/imx/clk.h | |
| parent | f13abeff2cdee2256e5f1c5a63fcc57ca8357010 (diff) | |
| download | linux-03d576f202e8cd40d500aa4f7594ad702d861096.tar.xz | |
clk: imx6: Make the LDB_DI0 and LDB_DI1 clocks read-only
Due to incorrect placement of the clock gate cell in the ldb_di[x]_clk
tree, the glitchy parent mux of ldb_di[x]_clk can cause a glitch to
enter the ldb_di_ipu_div divider. If the divider gets locked up, no
ldb_di[x]_clk is generated, and the LVDS display will hang when the
ipu_di_clk is sourced from ldb_di_clk.
To fix the problem, both the new and current parent of the ldb_di_clk
should be disabled before the switch. As this can not be guaranteed by
the clock framework during runtime, make the ldb_di[x]_sel muxes read-only.
A workaround to set the muxes once during boot could be added to the
kernel or bootloader.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/clk/imx/clk.h')
| -rw-r--r-- | drivers/clk/imx/clk.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index 3799ff82a9b4..4afad3b96a61 100644 --- a/drivers/clk/imx/clk.h +++ b/drivers/clk/imx/clk.h @@ -75,6 +75,14 @@ static inline struct clk *imx_clk_fixed(const char *name, int rate) return clk_register_fixed_rate(NULL, name, NULL, 0, rate); } +static inline struct clk *imx_clk_mux_ldb(const char *name, void __iomem *reg, + u8 shift, u8 width, const char **parents, int num_parents) +{ + return clk_register_mux(NULL, name, parents, num_parents, + CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT, reg, + shift, width, CLK_MUX_READ_ONLY, &imx_ccm_lock); +} + static inline struct clk *imx_clk_fixed_factor(const char *name, const char *parent, unsigned int mult, unsigned int div) { |