diff options
| author | Jerome Brunet <jbrunet@baylibre.com> | 2020-03-05 12:12:37 +0100 |
|---|---|---|
| committer | Neil Armstrong <narmstrong@baylibre.com> | 2020-04-06 09:56:35 +0200 |
| commit | b3d69aa596599c7c940f7ad463c04b693589ff9a (patch) | |
| tree | 5f484ddaee3f851539019d5d1a683457626cfc45 /drivers/clk/meson | |
| parent | 0392416fb1f2d8ff91ca6ec0471fc891445406e5 (diff) | |
| download | u-boot-b3d69aa596599c7c940f7ad463c04b693589ff9a.zip u-boot-b3d69aa596599c7c940f7ad463c04b693589ff9a.tar.gz u-boot-b3d69aa596599c7c940f7ad463c04b693589ff9a.tar.bz2 | |
clk: meson: reset mmc clock on probe
On some SoCs, depending on the boot device, the MMC clock block may be
left in a weird state by the ROM code, in which no decent clock may be
provided. Reset the related register to make sure a sane MMC clock is
ready for the controller.
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Diffstat (limited to 'drivers/clk/meson')
| -rw-r--r-- | drivers/clk/meson/axg.c | 7 | ||||
| -rw-r--r-- | drivers/clk/meson/g12a.c | 7 | ||||
| -rw-r--r-- | drivers/clk/meson/gxbb.c | 7 |
3 files changed, 21 insertions, 0 deletions
diff --git a/drivers/clk/meson/axg.c b/drivers/clk/meson/axg.c index 7035b59..4b0028d 100644 --- a/drivers/clk/meson/axg.c +++ b/drivers/clk/meson/axg.c @@ -291,6 +291,13 @@ static int meson_clk_probe(struct udevice *dev) if (IS_ERR(priv->map)) return PTR_ERR(priv->map); + /* + * Depending on the boot src, the state of the MMC clock might + * be different. Reset it to make sure we won't get stuck + */ + regmap_write(priv->map, HHI_NAND_CLK_CNTL, 0); + regmap_write(priv->map, HHI_SD_EMMC_CLK_CNTL, 0); + debug("meson-clk-axg: probed\n"); return 0; diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c index cada80e..c1976aa 100644 --- a/drivers/clk/meson/g12a.c +++ b/drivers/clk/meson/g12a.c @@ -978,6 +978,13 @@ static int meson_clk_probe(struct udevice *dev) if (IS_ERR(priv->map)) return PTR_ERR(priv->map); + /* + * Depending on the boot src, the state of the MMC clock might + * be different. Reset it to make sure we won't get stuck + */ + regmap_write(priv->map, HHI_NAND_CLK_CNTL, 0); + regmap_write(priv->map, HHI_SD_EMMC_CLK_CNTL, 0); + debug("meson-clk-g12a: probed\n"); return 0; diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c index e781e08..5ef4dd7 100644 --- a/drivers/clk/meson/gxbb.c +++ b/drivers/clk/meson/gxbb.c @@ -887,6 +887,13 @@ static int meson_clk_probe(struct udevice *dev) if (IS_ERR(priv->map)) return PTR_ERR(priv->map); + /* + * Depending on the boot src, the state of the MMC clock might + * be different. Reset it to make sure we won't get stuck + */ + regmap_write(priv->map, HHI_NAND_CLK_CNTL, 0); + regmap_write(priv->map, HHI_SD_EMMC_CLK_CNTL, 0); + debug("meson-clk: probed\n"); return 0; |