From: Jerry Huang Chang-Ming.Huang@freescale.com
In the current u-boot code, the value of these fields are the reserved value (0b100), through the signal integrity measurement on freescale's board with these reserved setting, the signal eye is out of the recommended spec for non-transition amplitude at 500mV nominal. According to the errata for MPC8379E, we should make a change to the recommended setting from essentially nothing at this time to 0b001 for SATA.
Signed-off-by: Jerry Huang Chang-Ming.Huang@freescale.com CC: Kim Phillips kim.phillips@freescale.com --- changes for v2: - use clrsetbits_be32 to clear and set the value
arch/powerpc/cpu/mpc83xx/serdes.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/cpu/mpc83xx/serdes.c b/arch/powerpc/cpu/mpc83xx/serdes.c index fecfc80..a88fab9 100644 --- a/arch/powerpc/cpu/mpc83xx/serdes.c +++ b/arch/powerpc/cpu/mpc83xx/serdes.c @@ -1,7 +1,7 @@ /* * Freescale SerDes initialization routine * - * Copyright (C) 2007 Freescale Semicondutor, Inc. + * Copyright (C) 2007,2011 Freescale Semicondutor, Inc. * Copyright (C) 2008 MontaVista Software, Inc. * * Author: Li Yang leoli@freescale.com @@ -20,6 +20,10 @@ /* SerDes registers */ #define FSL_SRDSCR0_OFFS 0x0 #define FSL_SRDSCR0_DPP_1V2 0x00008800 +#define FSL_SRDSCR0_TXEQA_MASK 0x00007000 +#define FSL_SRDSCR0_TXEQA_SATA 0x00001000 +#define FSL_SRDSCR0_TXEQE_MASK 0x00000700 +#define FSL_SRDSCR0_TXEQE_SATA 0x00000100 #define FSL_SRDSCR1_OFFS 0x4 #define FSL_SRDSCR1_PLLBW 0x00000040 #define FSL_SRDSCR2_OFFS 0x8 @@ -71,6 +75,11 @@ void fsl_setup_serdes(u32 offset, char proto, u32 rfcks, char vdd) tmp &= ~FSL_SRDSRSTCTL_SATA_RESET; out_be32(regs + FSL_SRDSRSTCTL_OFFS, tmp);
+ /* Configure SRDSCR0 */ + clrsetbits_be32(regs + FSL_SRDSCR0_OFFS, + FSL_SRDSCR0_TXEQA_MASK | FSL_SRDSCR0_TXEQE_MASK, + FSL_SRDSCR0_TXEQA_SATA | FSL_SRDSCR0_TXEQE_SATA); + /* Configure SRDSCR1 */ tmp = in_be32(regs + FSL_SRDSCR1_OFFS); tmp &= ~FSL_SRDSCR1_PLLBW;