diff options
| author | York Sun <yorksun@freescale.com> | 2011-08-26 11:32:43 -0700 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-09-29 19:01:06 -0500 |
| commit | 4e57382faa4bcad285baee21737de2c99ba6baad (patch) | |
| tree | 80e21640ec9d225d36938a6f92d8836434544aa8 /arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c | |
| parent | 905acde21a3662e366db4489238cdf35b3b2bb52 (diff) | |
| download | talos-obmc-uboot-4e57382faa4bcad285baee21737de2c99ba6baad.tar.gz talos-obmc-uboot-4e57382faa4bcad285baee21737de2c99ba6baad.zip | |
powerpc/mpc8xxx: Add DDR2 to unified DDR driver
DDR2 has different ODT table and values. Adding table according to Samsung
application note.
Fix additive latency calculation to avoid interger underflow.
Also converted typedef dynamic_odt_t to struct dynamic_odt.
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c index 8132e68d9d..20c7db03ed 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c @@ -448,7 +448,8 @@ compute_lowest_common_dimm_parameters(const dimm_params_t *dimm_params, #if defined(CONFIG_FSL_DDR2) if (lowest_good_caslat < 4) { - additive_latency = picos_to_mclk(tRCD_ps) - lowest_good_caslat; + additive_latency = (picos_to_mclk(tRCD_ps) > lowest_good_caslat) + ? picos_to_mclk(tRCD_ps) - lowest_good_caslat : 0; if (mclk_to_picos(additive_latency) > tRCD_ps) { additive_latency = picos_to_mclk(tRCD_ps); debug("setting additive_latency to %u because it was " |
