Remove chunk splitting in tinydrm_spi_transfer in tinydrm-helpers as the spi core will split
a buffer into max_dma_len chunks for the spi controller driver to handle, automatic byte
swapping in tinydrm_spi_transfer as it doesn't have users.
Signed-off-by: Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx>
---
drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 48 ++++----------------------
drivers/gpu/drm/tinydrm/mipi-dbi.c | 10 ++----
drivers/spi/spi-bcm2835.c | 2 +-
3 files changed, 9 insertions(+), 51 deletions(-)
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index bf96072d1b97..6064099e8e63 100644
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -452,62 +452,26 @@ int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
struct spi_transfer tr = {
.bits_per_word = bpw,
.speed_hz = speed_hz,
+ .tx_buf = buf,
+ .len = len
};
struct spi_message m;
- u16 *swap_buf = NULL;
size_t max_chunk;
- size_t chunk;
- int ret = 0;
- if (WARN_ON_ONCE(bpw != 8 && bpw != 16))
- return -EINVAL;
-
- max_chunk = tinydrm_spi_max_transfer_size(spi, 0);
+ max_chunk = SIZE_MAX;
if (drm_debug & DRM_UT_DRIVER)
pr_debug("[drm:%s] bpw=%u, max_chunk=%zu, transfers:\n",
- __func__, bpw, max_chunk);
-
- if (bpw == 16 && !tinydrm_spi_bpw_supported(spi, 16)) {
- tr.bits_per_word = 8;
- if (tinydrm_machine_little_endian()) {
- swap_buf = kmalloc(min(len, max_chunk), GFP_KERNEL);
- if (!swap_buf)
- return -ENOMEM;
- }
- }
+ __func__, bpw, max_chunk);
spi_message_init(&m);
if (header)
spi_message_add_tail(header, &m);
spi_message_add_tail(&tr, &m);
- while (len) {
- chunk = min(len, max_chunk);
-
- tr.tx_buf = buf;
- tr.len = chunk;
-
- if (swap_buf) {
- const u16 *buf16 = buf;
- unsigned int i;
-
- for (i = 0; i < chunk / 2; i++)
- swap_buf[i] = swab16(buf16[i]);
-
- tr.tx_buf = swap_buf;
- }
-
- buf += chunk;
- len -= chunk;
-
- tinydrm_dbg_spi_message(spi, &m);
- ret = spi_sync(spi, &m);
- if (ret)
- return ret;
- }
+ tinydrm_dbg_spi_message(spi, &m);
- return 0;
+ return spi_sync(spi, &m);
}
EXPORT_SYMBOL(tinydrm_spi_transfer);
diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 75dd65c57e74..c8af2d65c2ad 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -886,15 +886,9 @@ static int mipi_dbi_typec3_command(struct mipi_dbi *mipi, u8 cmd,
int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
struct gpio_desc *dc)
{
- size_t tx_size = tinydrm_spi_max_transfer_size(spi, 0);
struct device *dev = &spi->dev;
int ret;
- if (tx_size < 16) {
- DRM_ERROR("SPI transmit buffer too small: %zu\n", tx_size);
- return -EINVAL;
- }
-
/*
* Even though it's not the SPI device that does DMA (the master does),
* the dma mask is necessary for the dma_alloc_wc() in
@@ -924,8 +918,8 @@ int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
mipi->swap_bytes = true;
} else {
mipi->command = mipi_dbi_typec1_command;
- mipi->tx_buf9_len = tx_size;
- mipi->tx_buf9 = devm_kmalloc(dev, tx_size, GFP_KERNEL);
+ mipi->tx_buf9_len = SZ_16K;
+ mipi->tx_buf9 = devm_kmalloc(dev, mipi->tx_buf9_len, GFP_KERNEL);
if (!mipi->tx_buf9)
return -ENOMEM;
}
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index 0dcc45f158b8..2fd650891c07 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -448,7 +448,7 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
/* all went well, so set can_dma */
master->can_dma = bcm2835_spi_can_dma;
- master->max_dma_len = 65535; /* limitation by BCM2835_SPI_DLEN */
+ master->max_dma_len = 65528; /* limitation by BCM2835_SPI_DLEN */
/* need to do TX AND RX DMA, so we need dummy buffers */
master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
--
2.11.0
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