Christophe Leroy
b558275c1b
spi: fsl-cpm: Use 16 bit mode for large transfers with even size ...
(cherry picked from upstream fc96ec826bced75cc6b9c07a4ac44bbf651337ab)
On CPM, the RISC core is a lot more efficiant when doing transfers
in 16-bits chunks than in 8-bits chunks, but unfortunately the
words need to be byte swapped as seen in a previous commit.
So, for large tranfers with an even size, allocate a temporary tx
buffer and byte-swap data before and after transfer.
This change allows setting higher speed for transfer. For instance
on an MPC 8xx (CPM1 comms RISC processor), the documentation tells
that transfer in byte mode at 1 kbit/s uses 0.200% of CPM load
at 25 MHz while a word transfer at the same speed uses 0.032%
of CPM load. This means the speed can be 6 times higher in
word mode for the same CPM load.
For the time being, only do it on CPM1 as there must be a
trade-off between the CPM load reduction and the CPU load required
to byte swap the data.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/f2e981f20f92dd28983c3949702a09248c23845c.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30 12:44:08 +01:00
spi: atmel-quadspi: Fix the buswidth adjustment between spi-mem and controller
2022-04-27 13:50:50 +02:00
spi: change clk_disable_unprepare to clk_unprepare
2021-12-29 12:23:34 +01:00
spi: ath79: remove spi-master setup and cleanup assignment
2021-05-11 14:04:05 +02:00
spi: bcm-qspi: fix MSPI only access with bcm_qspi_exec_mem_op()
2022-04-15 14:18:38 +02:00
spi: bcm63xx-hsspi: Fix multi-bit mode setting
2023-03-11 16:43:47 +01:00
spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers
2022-07-29 17:14:16 +02:00
spi: Cleanup on failure of initial setup
2021-06-16 11:59:38 +02:00
spi: cadence: Correct initialisation of runtime PM again
2021-07-28 13:30:56 +02:00
spi: dln2: Fix reference leak to master
2021-05-11 14:04:06 +02:00
spi: fsl-cpm: Use 16 bit mode for large transfers with even size
2023-05-30 12:44:08 +01:00
spi: spi-fsl-dspi: Fix issue with uninitialized dma_slave_config
2021-09-15 09:47:29 +02:00
spi: fsl-lpspi: Fix PM reference leak in lpspi_prepare_xfer_hardware()
2021-05-14 09:44:21 +02:00
spi: fsl-cpm: Use 16 bit mode for large transfers with even size
2023-05-30 12:44:08 +01:00
spi: spi-geni-qcom: Fix use-after-free on unbind
2021-06-03 08:59:06 +02:00
spi: spi-gpio: Don't set MOSI as an input if not 3WIRE mode
2023-01-18 11:41:12 +01:00
spi: img-spfi: Fix pm_runtime_get_sync() error checking
2022-06-14 18:11:33 +02:00
spi: spi-imx: fix MX51_ECSPI_* macros when cs > 3
2023-05-30 12:44:03 +01:00
spi: spi-loopback-test: Fix 'tx_buf' might be 'rx_buf'
2021-07-14 16:53:10 +02:00
spi: meson-spicc: add IRQ check in meson_spicc_probe
2022-02-08 18:24:30 +01:00
spi: spi-meson-spifc: Add missing pm_runtime_disable() in meson_spifc_probe
2022-01-27 09:19:37 +01:00
spi: mediatek: Avoid NULL pointer crash in interrupt
2022-02-08 18:24:30 +01:00
spi: mxic: Fix the transmit path
2022-04-15 14:17:59 +02:00
spi: spi-nxp-fspi: move the register operation after the clock enable
2021-06-30 08:47:44 -04:00
spi/omap100k:Fix PM disable depth imbalance in omap1_spi100k_probe
2022-10-26 13:22:25 +02:00
spi: Cleanup on failure of initial setup
2021-06-16 11:59:38 +02:00
spi: Cleanup on failure of initial setup
2021-06-16 11:59:38 +02:00
spi: spi-pic32: Fix issue with uninitialized dma_slave_config
2021-09-15 09:47:29 +02:00
spi: spl022: fix Microwire full duplex mode
2021-11-17 09:48:21 +01:00
spi: pxa2xx-pci: Balance reference count for PCI DMA device
2022-04-15 14:18:04 +02:00
spi: Cleanup on failure of initial setup
2021-06-16 11:59:38 +02:00
spi: qup: Don't skip cleanup in remove's error path
2023-05-17 11:35:47 +02:00
spi: spi-rspi: Fix PIO fallback on RZ platforms
2022-08-25 11:17:32 +02:00
spi: s3c64xx: Fix large transfers with DMA
2022-10-26 13:22:25 +02:00
spi: sprd: Fix the wrong WDG_LOAD_VAL
2021-09-15 09:47:30 +02:00
spi: sprd: Add missing MODULE_DEVICE_TABLE
2021-06-16 11:59:34 +02:00
spi: stm32-qspi: Fix wait_cmd timeout in APM mode
2022-06-14 18:11:27 +02:00
spi: stm32: fix stm32_spi_prepare_mbr() that halves spi clk for every run
2022-12-08 11:22:57 +01:00
spi: spi-sun6i: Fix chipselect/clock bug
2021-07-14 16:53:24 +02:00
spi: synquacer: Fix timeout handling in synquacer_spi_transfer_one()
2023-03-11 16:43:47 +01:00
spi: tegra20: Use of_device_get_match_data()
2022-04-15 14:18:23 +02:00
spi: tegra114: Add missing IRQ check in tegra_spi_probe
2022-04-15 14:18:04 +02:00
spi: spi-ti-qspi: Fix return value handling of wait_for_completion_timeout
2022-06-14 18:11:32 +02:00
spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages()
2021-07-14 16:53:10 +02:00
spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()
2022-03-02 11:41:10 +01:00
spi: Fix erroneous sgs value with min_t()
2022-04-15 14:17:56 +02:00
spi: spidev: remove debug messages that access spidev->spi without locking
2023-02-06 07:52:41 +01:00
b558275c1b