Some SoCs e.g. (TI DRA7xx) need a START pulse to start the RAMINIT sequence i.e. START bit must be set and cleared before checking for the DONE bit status.
Signed-off-by: Roger Quadros <[email protected]> --- drivers/net/can/c_can/c_can.h | 1 + drivers/net/can/c_can/c_can_platform.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h index 0e17c7b..c6715ca 100644 --- a/drivers/net/can/c_can/c_can.h +++ b/drivers/net/can/c_can/c_can.h @@ -185,6 +185,7 @@ struct c_can_raminit { unsigned int reg; /* register index within syscon */ u8 start_bit; u8 done_bit; + bool needs_pulse; }; /* c_can private data structure */ diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index 3776483..b838c6b 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -124,6 +124,12 @@ static void c_can_hw_raminit_syscon(const struct c_can_priv *priv, bool enable) ctrl |= 1 << start_bit; regmap_write(raminit->syscon, raminit->reg, ctrl); + /* clear START bit if start pulse is needed */ + if (raminit->needs_pulse) { + ctrl &= ~(1 << start_bit); + regmap_write(raminit->syscon, raminit->reg, ctrl); + } + ctrl |= 1 << done_bit; c_can_hw_raminit_wait_syscon(priv, mask, ctrl); } @@ -330,6 +336,7 @@ static int c_can_plat_probe(struct platform_device *pdev) raminit->start_bit = drvdata->raminit_start_bits[id]; raminit->done_bit = drvdata->raminit_done_bits[id]; + raminit->needs_pulse = drvdata->raminit_pulse; priv->raminit = c_can_hw_raminit_syscon; } else { -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
