MdeModulePkg/AtaAtapiPassThru: relax PHY detect timeout

The SATA spec mandates that link detection by the PHY completes within
10 ms after receiving a reset signal. However, there is no obligation
to uphold this requirement at the driver end as strictly as we do, and
as it turns out, some combinations of host and device (e.g., Samsung
850 EVO connected to a LeMaker Cello) are only borderline compliant,
which means the device is not detected reliably.

So let's allow for a bit of margin, and increase the PHY detect timeout
value to 15 ms.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c

@@ -2376,8 +2376,7 @@ AhciModeInitialization (
       AhciOrReg (PciIo, Offset, EFI_AHCI_PORT_CMD_FRE);
 
       //
-      // Wait no longer than 10 ms to wait the Phy to detect the presence of a device.
-      // It's the requirment from SATA1.0a spec section 5.2.
+      // Wait for the Phy to detect the presence of a device.
       //
       PhyDetectDelay = EFI_AHCI_BUS_PHY_DETECT_TIMEOUT;
       Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_SSTS;