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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-08-19 14:59:01 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-08-20 22:38:14 +0100 |
| commit | 4e71d926abbe9ec23415f2ec8685a7bc26c1ceed (patch) | |
| tree | 29745f0c23ef7a03d7664f2deb53578511bd4967 /drivers/spi | |
| parent | feace90233a8cd44a18902216657279c3932d471 (diff) | |
| download | lwn-4e71d926abbe9ec23415f2ec8685a7bc26c1ceed.tar.gz lwn-4e71d926abbe9ec23415f2ec8685a7bc26c1ceed.zip | |
spi: rspi: Increase bit rate range for RSPI on SH
Increase bit rate range for RSPI on legacy SH by making use of the Bit
Rate Frequency Division Setting field in Command Registers, just like is
already done on RZ/A. This decreases the lower limit by a factor of 8.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200819125904.20938-5-geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index ad4ac867170b..ea3f2680d3c1 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -248,19 +248,32 @@ struct spi_ops { u8 num_hw_ss; }; +static void rspi_set_rate(struct rspi_data *rspi) +{ + unsigned long clksrc; + int brdv = 0, spbr; + + clksrc = clk_get_rate(rspi->clk); + spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz) - 1; + while (spbr > 255 && brdv < 3) { + brdv++; + spbr = DIV_ROUND_UP(spbr + 1, 2) - 1; + } + + rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR); + rspi->spcmd |= SPCMD_BRDV(brdv); +} + /* * functions for RSPI on legacy SH */ static int rspi_set_config_register(struct rspi_data *rspi, int access_size) { - int spbr; - /* Sets output mode, MOSI signal, and (optionally) loopback */ rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); /* Sets transfer bit rate */ - spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->speed_hz) - 1; - rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR); + rspi_set_rate(rspi); /* Disable dummy transmission, set 16-bit word access, 1 frame */ rspi_write8(rspi, 0, RSPI_SPDCR); @@ -290,23 +303,11 @@ static int rspi_set_config_register(struct rspi_data *rspi, int access_size) */ static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size) { - int spbr; - int brdv = 0; - unsigned long clksrc; - /* Sets output mode, MOSI signal, and (optionally) loopback */ rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); - clksrc = clk_get_rate(rspi->clk); - spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz) - 1; - while (spbr > 255 && brdv < 3) { - brdv++; - spbr = DIV_ROUND_UP(spbr + 1, 2) - 1; - } - /* Sets transfer bit rate */ - rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR); - rspi->spcmd |= SPCMD_BRDV(brdv); + rspi_set_rate(rspi); /* Disable dummy transmission, set byte access */ rspi_write8(rspi, SPDCR_SPLBYTE, RSPI_SPDCR); |