diff mbox

[U-Boot] powerpc/mpc8xxx: Allow override DDR read-to-write turnaround time

Message ID 1309450461-5848-1-git-send-email-yorksun@freescale.com
State Accepted
Commit 23f9670f1aee936ca468d2d0ddb0f025defde626
Delegated to: Kumar Gala
Headers show

Commit Message

York Sun June 30, 2011, 4:14 p.m. UTC
Add this option to allow boards to override the default read-to-write
turnaround time for better performance.

Signed-off-by: York Sun <yorksun@freescale.com>
---
 arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c |    3 +++
 arch/powerpc/include/asm/fsl_ddr_sdram.h |    3 +++
 2 files changed, 6 insertions(+), 0 deletions(-)

Comments

Kumar Gala July 11, 2011, 4:13 p.m. UTC | #1
On Jun 30, 2011, at 11:14 AM, York Sun wrote:

> Add this option to allow boards to override the default read-to-write
> turnaround time for better performance.
> 
> Signed-off-by: York Sun <yorksun@freescale.com>
> ---
> arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c |    3 +++
> arch/powerpc/include/asm/fsl_ddr_sdram.h |    3 +++
> 2 files changed, 6 insertions(+), 0 deletions(-)

applied to 85xx

- k
diff mbox

Patch

diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
index 02d069c..3824aad 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -267,6 +267,9 @@  static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr,
 	tmrd_mclk = 2;
 #endif
 
+	if (popts->trwt_override)
+		trwt_mclk = popts->trwt;
+
 	ddr->timing_cfg_0 = (0
 		| ((trwt_mclk & 0x3) << 30)	/* RWT */
 		| ((twrt_mclk & 0x3) << 28)	/* WRT */
diff --git a/arch/powerpc/include/asm/fsl_ddr_sdram.h b/arch/powerpc/include/asm/fsl_ddr_sdram.h
index 1778cc5..bc063ea 100644
--- a/arch/powerpc/include/asm/fsl_ddr_sdram.h
+++ b/arch/powerpc/include/asm/fsl_ddr_sdram.h
@@ -271,6 +271,9 @@  typedef struct memctl_options_s {
 	unsigned int rcw_2;
 	/* control register 1 */
 	unsigned int ddr_cdr1;
+
+	unsigned int trwt_override;
+	unsigned int trwt;			/* read-to-write turnaround */
 } memctl_options_t;
 
 extern phys_size_t fsl_ddr_sdram(void);