Re: [PATCH v3 08/16] ArmPlatformPkg: Implement LcdIdentify function for HDLCD GOP

[Evan Lloyd <Evan.Lloyd@arm.com>]

Reviewed-by: Evan Lloyd <evan.lloyd@arm.com>

> -----Original Message-----
> From: edk2-devel <edk2-devel-bounces@lists.01.org> On Behalf Of Girish
> Pathak
> Sent: 20 March 2018 16:12
> To: edk2-devel@lists.01.org
> Cc: nd <nd@arm.com>; Stephanie Hughes-Fitt <Stephanie.Hughes-
> Fitt@arm.com>; leif.lindholm@linaro.org; ard.biesheuvel@linaro.org
> Subject: [edk2] [PATCH v3 08/16] ArmPlatformPkg: Implement LcdIdentify
> function for HDLCD GOP
> 
> From: Girish Pathak <girish.pathak at arm.com>
> 
> 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>
> ---
>  ArmPlatformPkg/Library/HdLcd/HdLcd.c | 8 +++++++-
> ArmPlatformPkg/Library/HdLcd/HdLcd.h | 2 ++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/ArmPlatformPkg/Library/HdLcd/HdLcd.c
> b/ArmPlatformPkg/Library/HdLcd/HdLcd.c
> index
> 28306c530e08b5e0fcef4308435045da3c9e093c..039048398c531ec944bc4
> b43a5551a554a368481 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
> cd2c0366c7b563d7fb313f82abeef7eb1aa3ef72..1efa78eedc3013b3ab4615
> 181a59c7d15b851ab5 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_ */
> --
> 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
> 
> 
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel