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

diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index 272616a..af5bec8 100644 (file)
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -18,41 +18,8 @@
 #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
@@ -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()) {

diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 99509d1..ae31a5c 100644 (file)
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -964,15 +964,9 @@ 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
@@ -1001,8 +995,8 @@ 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/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
index dca75de..10b3537 100644 (file)
--- a/include/drm/tinydrm/tinydrm-helpers.h
+++ b/include/drm/tinydrm/tinydrm-helpers.h
@@ -41,7 +41,6 @@ int tinydrm_display_pipe_init(struct drm_device *drm,
                              const struct drm_display_mode *mode,
                              unsigned int rotation);
 
-size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
 int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
                         struct spi_transfer *header, u8 bpw, const void *buf,
                         size_t len);