sunxi: Fix H3 DRAM DQ read delay configuration

The read delays were set incorrectly, leading to reliability
issues at higher DRAM clock speeds. This commit adjusts this
to match the vendor boot0 behaviour.

Signed-off-by: Jens Kuske <jenskuske@gmail.com>
Tested-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/cpu/armv7/sunxi/dram_sun8i_h3.c

@@ -73,10 +73,10 @@ static void mctl_dq_delay(u32 read, u32 write)
 
 	for (i = 0; i < 4; i++) {
 		val = DATX_IOCR_WRITE_DELAY((write >> (i * 4)) & 0xf) |
-		      DATX_IOCR_READ_DELAY((read >> (i * 4)) & 0xf);
+		      DATX_IOCR_READ_DELAY(((read >> (i * 4)) & 0xf) * 2);
 
 		for (j = DATX_IOCR_DQ(0); j <= DATX_IOCR_DM; j++)
-			setbits_le32(&mctl_ctl->datx[i].iocr[j], val);
+			writel(val, &mctl_ctl->datx[i].iocr[j]);
 	}
 
 	clrbits_le32(&mctl_ctl->pgcr[0], 1 << 26);
@@ -85,8 +85,8 @@ static void mctl_dq_delay(u32 read, u32 write)
 		val = DATX_IOCR_WRITE_DELAY((write >> (16 + i * 4)) & 0xf) |
 		      DATX_IOCR_READ_DELAY((read >> (16 + i * 4)) & 0xf);
 
-		setbits_le32(&mctl_ctl->datx[i].iocr[DATX_IOCR_DQS], val);
-		setbits_le32(&mctl_ctl->datx[i].iocr[DATX_IOCR_DQSN], val);
+		writel(val, &mctl_ctl->datx[i].iocr[DATX_IOCR_DQS]);
+		writel(val, &mctl_ctl->datx[i].iocr[DATX_IOCR_DQSN]);
 	}
 
 	setbits_le32(&mctl_ctl->pgcr[0], 1 << 26);
@@ -436,8 +436,8 @@ unsigned long sunxi_dram_init(void)
 			(struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 
 	struct dram_para para = {
-		.read_delays = 0x00007979,
-		.write_delays = 0x6aaa0000,
+		.read_delays = 0x00007979,	/* dram_tpr12 */
+		.write_delays = 0x6aaa0000,	/* dram_tpr11 */
 		.dual_rank = 0,
 		.bus_width = 32,
 		.row_bits = 15,