The graphics command expects 16 hexadecimal literals, but would allow 
characters in range [0-9a-zA-Z] instead of [0-9a-fA-F].

Signed-off-by: Robert Abel <ra...@robertabel.eu>
---
 drivers/auxdisplay/charlcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index 642afd88870b..324d02f9f1c5 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -441,9 +441,9 @@ static inline int handle_lcd_special_code(struct charlcd 
*lcd)
                        shift ^= 4;
                        if (*esc >= '0' && *esc <= '9') {
                                value |= (*esc - '0') << shift;
-                       } else if (*esc >= 'A' && *esc <= 'Z') {
+                       } else if (*esc >= 'A' && *esc <= 'F') {
                                value |= (*esc - 'A' + 10) << shift;
-                       } else if (*esc >= 'a' && *esc <= 'z') {
+                       } else if (*esc >= 'a' && *esc <= 'f') {
                                value |= (*esc - 'a' + 10) << shift;
                        } else {
                                esc++;
-- 
2.11.0

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