diff options
| author | Alex Elder <elder@riscstar.com> | 2025-10-27 08:30:03 -0500 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-11-06 16:57:34 +0000 |
| commit | 1797d254f5c4b46b295527a635af7321a3fe1318 (patch) | |
| tree | f65978c2dee0952a28faad0bf51f74e19c421fd7 | |
| parent | 6b398c1d3da7a673b13b1857f9fff4c15ee20cef (diff) | |
spi: fsl-qspi: add a clock disable quirk
The SpacemiT K1 SoC QSPI implementation needs to avoid shutting off the
clock when changing its rate. Add a new quirk to indicate that disabling
and enabling the clock should be skipped when changing its rate.
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Alex Elder <elder@riscstar.com>
Link: https://patch.msgid.link/20251027133008.360237-6-elder@riscstar.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-fsl-qspi.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c index 1944e63169d3..2c030dd6facc 100644 --- a/drivers/spi/spi-fsl-qspi.c +++ b/drivers/spi/spi-fsl-qspi.c @@ -197,6 +197,11 @@ */ #define QUADSPI_QUIRK_USE_TDH_SETTING BIT(5) +/* + * Do not disable the "qspi" clock when changing its rate. + */ +#define QUADSPI_QUIRK_SKIP_CLK_DISABLE BIT(6) + struct fsl_qspi_devtype_data { unsigned int rxfifo; unsigned int txfifo; @@ -306,6 +311,11 @@ static bool needs_tdh_setting(struct fsl_qspi *q) return !!(q->devtype_data->quirks & QUADSPI_QUIRK_USE_TDH_SETTING); } +static bool needs_clk_disable(struct fsl_qspi *q) +{ + return !(q->devtype_data->quirks & QUADSPI_QUIRK_SKIP_CLK_DISABLE); +} + /* * An IC bug makes it necessary to rearrange the 32-bit data. * Later chips, such as IMX6SLX, have fixed this bug. @@ -536,15 +546,18 @@ static void fsl_qspi_select_mem(struct fsl_qspi *q, struct spi_device *spi, if (needs_4x_clock(q)) rate *= 4; - fsl_qspi_clk_disable_unprep(q); + if (needs_clk_disable(q)) + fsl_qspi_clk_disable_unprep(q); ret = clk_set_rate(q->clk, rate); if (ret) return; - ret = fsl_qspi_clk_prep_enable(q); - if (ret) - return; + if (needs_clk_disable(q)) { + ret = fsl_qspi_clk_prep_enable(q); + if (ret) + return; + } q->selected = spi_get_chipselect(spi, 0); |