diff options
| author | Julien Panis <[email protected]> | 2023-05-29 15:42:28 +0200 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2023-06-20 16:08:13 -0400 |
| commit | fb93bd8d264c3198f321dc23a83559fcfcc275d4 (patch) | |
| tree | 5b78e6f5ae34e161dad180cd384a956f03c25355 /drivers | |
| parent | 8dc2c666808a07c2ad484ef6c4f89aa551eaf265 (diff) | |
drivers: spi: omap3_spi: Initialize mode for all channels
At first SPI transfers, multiple chip selects can be
enabled simultaneously. This is due to chip select
polarity, which is not properly initialized for all
channels. This patch fixes the issue.
Signed-off-by: Julien Panis <[email protected]>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/omap3_spi.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c index 1cbb5d46fd6..ff7b55f8707 100644 --- a/drivers/spi/omap3_spi.c +++ b/drivers/spi/omap3_spi.c @@ -347,20 +347,28 @@ static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv) omap3_spi_write_chconf(priv, confr); } -static void spi_reset(struct mcspi *regs) +static void spi_reset(struct omap3_spi_priv *priv) { unsigned int tmp; - writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, ®s->sysconfig); + writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &priv->regs->sysconfig); do { - tmp = readl(®s->sysstatus); + tmp = readl(&priv->regs->sysstatus); } while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE)); writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE | OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP | - OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, ®s->sysconfig); + OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, &priv->regs->sysconfig); - writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, ®s->wakeupenable); + writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &priv->regs->wakeupenable); + + /* + * Set the same default mode for each channel, especially CS polarity + * which must be common for all SPI slaves before any transfer. + */ + for (priv->cs = 0 ; priv->cs < OMAP4_MCSPI_CHAN_NB ; priv->cs++) + _omap3_spi_set_mode(priv); + priv->cs = 0; } static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv) @@ -430,7 +438,7 @@ static int omap3_spi_probe(struct udevice *dev) priv->pin_dir = plat->pin_dir; priv->wordlen = SPI_DEFAULT_WORDLEN; - spi_reset(priv->regs); + spi_reset(priv); return 0; } |