drm/tinydrm: Remove tinydrm_spi_max_transfer_size()

spi-bcm2835 can handle >64kB buffers now so there is no need to check
->max_dma_len. The tinydrm_spi_max_transfer_size() max_len argument is
not used by any callers, so not needed.

Then we have the spi_max module parameter. It was added because
staging/fbtft has support for it and there was a report that someone used
it to set a small buffer size to avoid popping on a USB soundcard on a
Raspberry Pi. In hindsight it shouldn't have been added, I should have
waited for it to become a problem first. I don't know it anyone is
actually using it, but since tinydrm_spi_transfer() is being moved to
mipi-dbi, I'm taking the opportunity to remove it. I'll add it back to
mipi-dbi if someone complains.

With that out of the way, spi_max_transfer_size() can be used instead.

The chosen 16kB buffer size for Type C Option 1 (9-bit) interface is
somewhat arbitrary, but a bigger buffer will have a miniscule impact on
transfer speed, so it's probably fine.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-6-noralf@tronnes.org

1 files changed, 1 insertions, 36 deletions

diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index 272616a246cd..af5bec8861de 100644
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -18,42 +18,9 @@
 #include <drm/drm_rect.h>
 #include <drm/tinydrm/tinydrm-helpers.h>
 
-static unsigned int spi_max;
-module_param(spi_max, uint, 0400);
-MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
-
 #if IS_ENABLED(CONFIG_SPI)
 
 /**
- * tinydrm_spi_max_transfer_size - Determine max SPI transfer size
- * @spi: SPI device
- * @max_len: Maximum buffer size needed (optional)
- *
- * This function returns the maximum size to use for SPI transfers. It checks
- * the SPI master, the optional @max_len and the module parameter spi_max and
- * returns the smallest.
- *
- * Returns:
- * Maximum size for SPI transfers
- */
-size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len)
-{
-	size_t ret;
-
-	ret = min(spi_max_transfer_size(spi), spi->master->max_dma_len);
-	if (max_len)
-		ret = min(ret, max_len);
-	if (spi_max)
-		ret = min_t(size_t, ret, spi_max);
-	ret &= ~0x3;
-	if (ret < 4)
-		ret = 4;
-
-	return ret;
-}
-EXPORT_SYMBOL(tinydrm_spi_max_transfer_size);
-
-/**
  * tinydrm_spi_transfer - SPI transfer helper
  * @spi: SPI device
  * @speed_hz: Override speed (optional)
@@ -75,21 +42,19 @@ int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
 			 struct spi_transfer *header, u8 bpw, const void *buf,
 			 size_t len)
 {
+	size_t max_chunk = spi_max_transfer_size(spi);
 	struct spi_transfer tr = {
 		.bits_per_word = bpw,
 		.speed_hz = speed_hz,
 	};
 	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);
-
 	if (bpw == 16 && !spi_is_bpw_supported(spi, 16)) {
 		tr.bits_per_word = 8;
 		if (tinydrm_machine_little_endian()) {