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| author | Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> | 2023-09-29 08:38:49 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2023-10-05 13:44:34 +0200 |
| commit | 549f4ae2601f968e2474c6031fb4799468882f64 (patch) | |
| tree | ac694c2d0e26212e1859276876384627dc240869 /drivers/clk/renesas | |
| parent | d5252d9697a3e7007c741e9c103073868955a304 (diff) | |
| download | linux-549f4ae2601f968e2474c6031fb4799468882f64.tar.gz linux-549f4ae2601f968e2474c6031fb4799468882f64.tar.bz2 linux-549f4ae2601f968e2474c6031fb4799468882f64.zip | |
clk: renesas: rzg2l: Wait for status bit of SD mux before continuing
The hardware user manual for RZ/G2L (r01uh0914ej0130-rzg2l-rzg2lc.pdf,
chapter 7.4.7 Procedure for Switching Clocks by the Dynamic Switching
Frequency Selectors) specifies that we need to check CPG_PL2SDHI_DSEL
for SD clock switching status.
Fixes: eaff33646f4cb ("clk: renesas: rzg2l: Add SDHI clk mux support")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230929053915.1530607-3-claudiu.beznea@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/clk/renesas')
| -rw-r--r-- | drivers/clk/renesas/rzg2l-cpg.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index 9baae7bb7094..5343d04fd70d 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -188,7 +188,8 @@ static int rzg2l_cpg_sd_clk_mux_set_parent(struct clk_hw *hw, u8 index) u32 off = GET_REG_OFFSET(hwdata->conf); u32 shift = GET_SHIFT(hwdata->conf); const u32 clk_src_266 = 2; - u32 bitmask; + u32 msk, val, bitmask; + int ret; /* * As per the HW manual, we should not directly switch from 533 MHz to @@ -202,14 +203,10 @@ static int rzg2l_cpg_sd_clk_mux_set_parent(struct clk_hw *hw, u8 index) * the index to value mapping is done by adding 1 to the index. */ bitmask = (GENMASK(GET_WIDTH(hwdata->conf) - 1, 0) << shift) << 16; + msk = off ? CPG_CLKSTATUS_SELSDHI1_STS : CPG_CLKSTATUS_SELSDHI0_STS; if (index != clk_src_266) { - u32 msk, val; - int ret; - writel(bitmask | ((clk_src_266 + 1) << shift), priv->base + off); - msk = off ? CPG_CLKSTATUS_SELSDHI1_STS : CPG_CLKSTATUS_SELSDHI0_STS; - ret = readl_poll_timeout(priv->base + CPG_CLKSTATUS, val, !(val & msk), 100, CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US); @@ -221,7 +218,13 @@ static int rzg2l_cpg_sd_clk_mux_set_parent(struct clk_hw *hw, u8 index) writel(bitmask | ((index + 1) << shift), priv->base + off); - return 0; + ret = readl_poll_timeout(priv->base + CPG_CLKSTATUS, val, + !(val & msk), 100, + CPG_SDHI_CLK_SWITCH_STATUS_TIMEOUT_US); + if (ret) + dev_err(priv->dev, "failed to switch clk source\n"); + + return ret; } static u8 rzg2l_cpg_sd_clk_mux_get_parent(struct clk_hw *hw) |