From 1ff5283d92b25e449358bd88bc0b18db4be61d4f Mon Sep 17 00:00:00 2001
From: Jagan Teki <jagan@amarulasolutions.com>
Date: Mon, 15 Jul 2019 23:58:53 +0530
Subject: [PATCH] ram: rk3399: Compute stride for 1 channel a
Add stride computation for the sdram which support
single channel a
This configuration available in NanoPi NEO4 and the
same can work with existing rk3399-sdram-ddr3-1866.dtsi
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
---
drivers/ram/rockchip/sdram_rk3399.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index c626ef602c..8bbacb5275 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -1211,6 +1211,10 @@ static unsigned char calculate_stride(struct rk3399_sdram_params *params)
chinfo |= 1 << channel;
}
+ /* stride calculation for 1 channel */
+ if (params->base.num_channels == 1 && chinfo & 1)
+ return 0x17; /* channel a */
+
/* stride calculation for 2 channels, default gstride type is 256B */
if (ch_cap[0] == ch_cap[1]) {
cap = ch_cap[0] + ch_cap[1];
--
2.39.5