drm/tinydrm: export mipi_dbi_buf_copy and mipi_dbi_spi_cmd_max_speed

This exports the mipi_dbi_buf_copy() and mipi_dbi_spi_cmd_max_speed()
functions so that they can be shared with other drivers.

Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1511122328-31133-4-git-send-email-david@lechnology.com

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 347f9b226f26..aa6b6ce56891 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -154,8 +154,18 @@ int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len)
 }
 EXPORT_SYMBOL(mipi_dbi_command_buf);
 
-static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
-                                struct drm_clip_rect *clip, bool swap)
+/**
+ * mipi_dbi_buf_copy - Copy a framebuffer, transforming it if necessary
+ * @dst: The destination buffer
+ * @fb: The source framebuffer
+ * @clip: Clipping rectangle of the area to be copied
+ * @swap: When true, swap MSB/LSB of 16-bit values
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
+                      struct drm_clip_rect *clip, bool swap)
 {
         struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
         struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
@@ -192,6 +202,7 @@ static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
                                              DMA_FROM_DEVICE);
         return ret;
 }
+EXPORT_SYMBOL(mipi_dbi_buf_copy);
 
 static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
                              struct drm_file *file_priv,
@@ -444,18 +455,23 @@ EXPORT_SYMBOL(mipi_dbi_display_is_on);
 
 #if IS_ENABLED(CONFIG_SPI)
 
-/*
+/**
+ * mipi_dbi_spi_cmd_max_speed - get the maximum SPI bus speed
+ * @spi: SPI device
+ * @len: The transfer buffer length.
+ *
  * Many controllers have a max speed of 10MHz, but can be pushed way beyond
  * that. Increase reliability by running pixel data at max speed and the rest
  * at 10MHz, preventing transfer glitches from messing up the init settings.
  */
-static u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
+u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
 {
         if (len > 64)
                 return 0; /* use default */
 
         return min_t(u32, 10000000, spi->max_speed_hz);
 }
+EXPORT_SYMBOL(mipi_dbi_spi_cmd_max_speed);
 
 /*
  * MIPI DBI Type C Option 1