[v2,10/99] ram: rk3399: Use rank mask in wdql data training
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Message ID 20190617073252.27810-11-jagan@amarulasolutions.com
State New
Headers show
Series
  • ram: rk3399: Add LPDDR4 support
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Commit Message

Jagan Teki June 17, 2019, 7:31 a.m. UTC 
Add rank_mask based on the rank number, this would keep
the wdql data training loop based on the desired rank mask
value instead of looping for all values.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
---
 drivers/ram/rockchip/sdram_rk3399.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Patch
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diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 76d6440f9a..32fc7771b3 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -851,11 +851,17 @@  static int data_training_wdql(const struct chan_info *chan, u32 channel,
 	u32 *denali_pi = chan->pi->denali_pi;
 	u32 i, tmp;
 	u32 rank = params->ch[channel].rank;
+	u32 rank_mask;
 
 	/* clear interrupt,PI_175 PI_INT_ACK:WR:0:17 */
 	writel(0x00003f7c, (&denali_pi[175]));
 
-	for (i = 0; i < rank; i++) {
+	rank_mask = (rank == 1) ? 0x1 : 0x3;
+
+	for (i = 0; i < 4; i++) {
+		if (!(rank_mask & (1 << i)))
+			continue;
+
 		select_per_cs_training_index(chan, i);
 
 		/*