[U-Boot] [PATCH] davinci: omapl138_lcdk: fix tXSNR DDR2 timing value
As per the datasheet[1] available for DDR2 part on board the OMAP-L138 LCDK, the tXSNR (exit self refresh to a non-read command) is 137.5 ns. This corresponds to a value of 20 to be written to T_XSNR register field of OMAP-L138's DDR configuration. The DDR2 is at 150 MHz.
Fix this. The correct value also appears on the initialization scripts (called CCS GEL files) available on TI's wiki pages[2]
[1] http://www.samsung.com/global/business/semiconductor/file/product/ds_k4t1gxx... [2] http://processors.wiki.ti.com/index.php/L138/C6748_Development_Kit_(LCDK)#CC...
Signed-off-by: Sekhar Nori nsekhar@ti.com --- include/configs/omapl138_lcdk.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/configs/omapl138_lcdk.h b/include/configs/omapl138_lcdk.h index 9db4eeb54edf..88cdf08b1979 100644 --- a/include/configs/omapl138_lcdk.h +++ b/include/configs/omapl138_lcdk.h @@ -110,7 +110,7 @@ (7 << DV_DDR_SDTMR2_RASMAX_SHIFT) | \ (2 << DV_DDR_SDTMR2_XP_SHIFT) | \ (0 << DV_DDR_SDTMR2_ODT_SHIFT) | \ - (10 << DV_DDR_SDTMR2_XSNR_SHIFT) | \ + (20 << DV_DDR_SDTMR2_XSNR_SHIFT) | \ (199 << DV_DDR_SDTMR2_XSRD_SHIFT) | \ (1 << DV_DDR_SDTMR2_RTP_SHIFT) | \ (2 << DV_DDR_SDTMR2_CKE_SHIFT))
On Fri, Jun 02, 2017 at 06:07:12PM +0530, Sekhar Nori wrote:
As per the datasheet[1] available for DDR2 part on board the OMAP-L138 LCDK, the tXSNR (exit self refresh to a non-read command) is 137.5 ns. This corresponds to a value of 20 to be written to T_XSNR register field of OMAP-L138's DDR configuration. The DDR2 is at 150 MHz.
Fix this. The correct value also appears on the initialization scripts (called CCS GEL files) available on TI's wiki pages[2]
[1] http://www.samsung.com/global/business/semiconductor/file/product/ds_k4t1gxx... [2] http://processors.wiki.ti.com/index.php/L138/C6748_Development_Kit_(LCDK)#CC...
Signed-off-by: Sekhar Nori nsekhar@ti.com
Reviewed-by: Tom Rini trini@konsulko.com
On Fri, Jun 02, 2017 at 06:07:12PM +0530, Sekhar Nori wrote:
As per the datasheet[1] available for DDR2 part on board the OMAP-L138 LCDK, the tXSNR (exit self refresh to a non-read command) is 137.5 ns. This corresponds to a value of 20 to be written to T_XSNR register field of OMAP-L138's DDR configuration. The DDR2 is at 150 MHz.
Fix this. The correct value also appears on the initialization scripts (called CCS GEL files) available on TI's wiki pages[2]
[1] http://www.samsung.com/global/business/semiconductor/file/product/ds_k4t1gxx... [2] http://processors.wiki.ti.com/index.php/L138/C6748_Development_Kit_(LCDK)#CC...
Signed-off-by: Sekhar Nori nsekhar@ti.com Reviewed-by: Tom Rini trini@konsulko.com
Applied to u-boot/master, thanks!
participants (2)
-
Sekhar Nori -
Tom Rini