diff --git a/Documentation/NuttxUserGuide.html b/Documentation/NuttxUserGuide.html
index 35032cc820..366b9ae97f 100644
--- a/Documentation/NuttxUserGuide.html
+++ b/Documentation/NuttxUserGuide.html
@@ -8681,6 +8681,7 @@ int fsetpos(FILE *stream, fpos_t *pos);
long ftell(FILE *stream);
size_t fwrite(const void *ptr, size_t size, size_t n_items, FILE *stream);
char *gets(char *s);
+int setvbuf(FAR FILE *stream, FAR char *buffer, int mode, size_t size);
int ungetc(int c, FAR FILE *stream);
int printf(const char *format, ...);
diff --git a/drivers/lcd/ssd1306.h b/drivers/lcd/ssd1306.h
index 9fd38cc020..d1795cd299 100644
--- a/drivers/lcd/ssd1306.h
+++ b/drivers/lcd/ssd1306.h
@@ -276,7 +276,7 @@ void ssd1306_sendblk(FAR struct ssd1306_dev_s *priv, uint8_t *data, uint8_t len)
#ifdef CONFIG_LCD_SSD1306_SPI
void ssd1306_select(FAR struct ssd1306_dev_s *priv, bool cs);
void ssd1306_cmddata(FAR struct ssd1306_dev_s *priv, bool cmd);
-static inline void ssd1306_configspi(FAR struct spi_dev_s *spi);
+void ssd1306_configspi(FAR struct spi_dev_s *spi);
#else
# define ssd1306_select(priv, cs)
diff --git a/drivers/lcd/ssd1306_spi.c b/drivers/lcd/ssd1306_spi.c
index 33d6d61961..9a547b8a16 100644
--- a/drivers/lcd/ssd1306_spi.c
+++ b/drivers/lcd/ssd1306_spi.c
@@ -51,7 +51,7 @@
#if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_SPI)
/****************************************************************************
- * Private Functions
+ * Public Functions
****************************************************************************/
/****************************************************************************
@@ -61,7 +61,7 @@
*
****************************************************************************/
-static inline void ssd1306_configspi(FAR struct spi_dev_s *spi)
+void ssd1306_configspi(FAR struct spi_dev_s *spi)
{
lcdinfo("Mode: %d Bits: 8 Frequency: %d\n",
CONFIG_SSD1306_SPIMODE, CONFIG_SSD1306_FREQUENCY);
@@ -74,10 +74,6 @@ static inline void ssd1306_configspi(FAR struct spi_dev_s *spi)
(void)SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
}
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
/****************************************************************************
* Name: ssd1306_sendbyte
*