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| author | Girish Pathak <girish.pathak at arm.com> | 2017-09-26 21:15:21 +0100 |
|---|---|---|
| committer | Leif Lindholm <leif.lindholm@linaro.org> | 2018-04-23 12:00:52 +0100 |
| commit | c18ef81e79c2beccc5738e564fb56f1b78d2d5fc (patch) | |
| tree | 12733b7dda6ab371cd4402ebd058b75467c1fec7 /ArmPlatformPkg | |
| parent | b5daabdcd8a88db615a5d1dfb7b35b61b1ede0c5 (diff) | |
| download | edk2-c18ef81e79c2beccc5738e564fb56f1b78d2d5fc.tar.gz edk2-c18ef81e79c2beccc5738e564fb56f1b78d2d5fc.tar.bz2 edk2-c18ef81e79c2beccc5738e564fb56f1b78d2d5fc.zip | |
ArmPlatformPkg: Implement LcdIdentify function for HDLCD GOP
LcdIdentify function does not currently check presence of HDLCD
controller.
Implement this functionality by reading HDLCD_REG_VERSION and checking
against the PRODUCT_ID field to detect presence of HDLCD controller.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Girish Pathak <girish.pathak@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'ArmPlatformPkg')
| -rw-r--r-- | ArmPlatformPkg/Library/HdLcd/HdLcd.c | 8 | ||||
| -rw-r--r-- | ArmPlatformPkg/Library/HdLcd/HdLcd.h | 2 |
2 files changed, 9 insertions, 1 deletions
diff --git a/ArmPlatformPkg/Library/HdLcd/HdLcd.c b/ArmPlatformPkg/Library/HdLcd/HdLcd.c index 28306c530e..039048398c 100644 --- a/ArmPlatformPkg/Library/HdLcd/HdLcd.c +++ b/ArmPlatformPkg/Library/HdLcd/HdLcd.c @@ -175,11 +175,17 @@ LcdShutdown ( @retval EFI_SUCCESS Returns success if platform implements a HDLCD
controller.
+ @retval EFI_NOT_FOUND HDLCD display controller not found on the
+ platform.
**/
EFI_STATUS
LcdIdentify (
VOID
)
{
- return EFI_SUCCESS;
+ if ((MmioRead32 (HDLCD_REG_VERSION) >> 16) == HDLCD_PRODUCT_ID) {
+ return EFI_SUCCESS;
+ }
+
+ return EFI_NOT_FOUND;
}
diff --git a/ArmPlatformPkg/Library/HdLcd/HdLcd.h b/ArmPlatformPkg/Library/HdLcd/HdLcd.h index cd2c0366c7..1efa78eedc 100644 --- a/ArmPlatformPkg/Library/HdLcd/HdLcd.h +++ b/ArmPlatformPkg/Library/HdLcd/HdLcd.h @@ -85,4 +85,6 @@ // Number of bytes per pixel
#define HDLCD_4BYTES_PER_PIXEL ((4 - 1) << 3)
+#define HDLCD_PRODUCT_ID 0x1CDC
+
#endif /* HDLCD_H_ */
|