[PATCH v1 02/36] soc: fsl: cpm1: qmc: Enable TRNSYNC only when needed
From: Herve Codina <herve.codina@bootlin.com>
Date: 2024-07-29 14:21:23
Also in:
linux-arm-kernel, linux-devicetree, lkml
Subsystem:
freescale quicc engine library, freescale quicc engine qmc driver, freescale soc drivers, the rest · Maintainers:
Qiang Zhao, Christophe Leroy, Herve Codina, Linus Torvalds
The TRNSYNC feature is enabled whatever the number of time-slots used. The feature is needed only when more than one time-slot is used. Improve the driver enabling TRNSYNC only when it is needed. Signed-off-by: Herve Codina <herve.codina@bootlin.com> --- drivers/soc/fsl/qe/qmc.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index bacabf731dcb..916395745850 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c@@ -889,6 +889,7 @@ EXPORT_SYMBOL(qmc_chan_stop); static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan) { struct tsa_serial_info info; + unsigned int w_rx, w_tx; u16 first_rx, last_tx; u16 trnsync; int ret;
@@ -898,6 +899,14 @@ static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan) if (ret) return ret; + w_rx = hweight64(chan->rx_ts_mask); + w_tx = hweight64(chan->tx_ts_mask); + if (w_rx <= 1 && w_tx <= 1) { + dev_dbg(qmc->dev, "only one or zero ts -> disable trnsync\n"); + qmc_clrbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_TRANSP_SYNC); + return 0; + } + /* Find the first Rx TS allocated to the channel */ first_rx = chan->rx_ts_mask ? __ffs64(chan->rx_ts_mask) + 1 : 0;
@@ -911,6 +920,7 @@ static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan) trnsync |= QMC_SPE_TRNSYNC_TX((last_tx % info.nb_tx_ts) * 2); qmc_write16(chan->s_param + QMC_SPE_TRNSYNC, trnsync); + qmc_setbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_TRANSP_SYNC); dev_dbg(qmc->dev, "chan %u: trnsync=0x%04x, rx %u/%u 0x%llx, tx %u/%u 0x%llx\n", chan->id, trnsync,
@@ -1378,7 +1388,7 @@ static int qmc_setup_chan(struct qmc *qmc, struct qmc_chan *chan) if (chan->mode == QMC_TRANSPARENT) { qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080); qmc_write16(chan->s_param + QMC_SPE_TMRBLR, 60); - val = QMC_SPE_CHAMR_MODE_TRANSP | QMC_SPE_CHAMR_TRANSP_SYNC; + val = QMC_SPE_CHAMR_MODE_TRANSP; if (chan->is_reverse_data) val |= QMC_SPE_CHAMR_TRANSP_RD; qmc_write16(chan->s_param + QMC_SPE_CHAMR, val);
--
2.45.0