mirror of
https://github.com/coolsnowwolf/lede.git
synced 2025-04-16 04:13:31 +00:00
be32bce9df
RK3528 is a cost down SoC with high CPU performance. However, it has poor PCIe performance (same for RK3576). Also CPU 0/1 can't get any rest due to rkbin limitation. Some code references: https://github.com/warpme/minimyth2
111 lines
3.5 KiB
Diff
111 lines
3.5 KiB
Diff
From 4ff037c13c1e7ab16362d39a59ebb8fffb929f99 Mon Sep 17 00:00:00 2001
|
|
From: Shawn Lin <shawn.lin@rock-chips.com>
|
|
Date: Wed, 15 Apr 2020 09:19:09 +0800
|
|
Subject: [PATCH] mmc: dw_mmc-rockchip: add v2 tuning support
|
|
|
|
v2 tuning will inherit pre-stage loader's phase
|
|
settings for the first time, and do re-tune if
|
|
necessary. Re-tune will still try the rough degrees,
|
|
for instance, 90, 180, 270, 360 but continue to do the
|
|
fine tuning if sample window isn't good enough.
|
|
|
|
Change-Id: I593384ee381d09df5b9adfc29a18eb22517b2764
|
|
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
|
|
---
|
|
drivers/mmc/host/dw_mmc-rockchip.c | 48 ++++++++++++++++++++++++++++++
|
|
1 file changed, 48 insertions(+)
|
|
|
|
--- a/drivers/mmc/host/dw_mmc-rockchip.c
|
|
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
|
|
@@ -24,6 +24,8 @@ struct dw_mci_rockchip_priv_data {
|
|
struct clk *sample_clk;
|
|
int default_sample_phase;
|
|
int num_phases;
|
|
+ int last_degree;
|
|
+ bool use_v2_tuning;
|
|
};
|
|
|
|
static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
|
|
@@ -134,6 +136,58 @@ static void dw_mci_rk3288_set_ios(struct
|
|
#define TUNING_ITERATION_TO_PHASE(i, num_phases) \
|
|
(DIV_ROUND_UP((i) * 360, num_phases))
|
|
|
|
+static int dw_mci_v2_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
|
|
+{
|
|
+ struct dw_mci *host = slot->host;
|
|
+ struct dw_mci_rockchip_priv_data *priv = host->priv;
|
|
+ struct mmc_host *mmc = slot->mmc;
|
|
+ u32 degrees[4] = {0, 90, 180, 270}, degree;
|
|
+ int i;
|
|
+ static bool inherit = true;
|
|
+
|
|
+ if (inherit) {
|
|
+ inherit = false;
|
|
+ i = clk_get_phase(priv->sample_clk) / 90;
|
|
+ degree = degrees[i];
|
|
+ goto done;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * v2 only support 4 degrees in theory.
|
|
+ * First we inherit sample phases from firmware, which should
|
|
+ * be able work fine, at least in the first place.
|
|
+ * If retune is needed, we search forward to pick the last
|
|
+ * one phase from degree list and loop around until we get one.
|
|
+ * It's impossible all 4 fixed phase won't be able to work.
|
|
+ */
|
|
+ for (i = 0; i < ARRAY_SIZE(degrees); i++) {
|
|
+ degree = degrees[i] + priv->last_degree + 90;
|
|
+ degree = degree % 360;
|
|
+ clk_set_phase(priv->sample_clk, degree);
|
|
+ if (mmc_send_tuning(mmc, opcode, NULL)) {
|
|
+ /*
|
|
+ * Tuning error, the phase is a bad phase,
|
|
+ * then try using the calculated best phase.
|
|
+ */
|
|
+ dev_info(host->dev, "V2 tuned phase to %d error, try the best phase\n", degree);
|
|
+ degree = (degree + 180) % 360;
|
|
+ clk_set_phase(priv->sample_clk, degree);
|
|
+ if (!mmc_send_tuning(mmc, opcode, NULL))
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (i == ARRAY_SIZE(degrees)) {
|
|
+ dev_warn(host->dev, "V2 All phases bad!");
|
|
+ return -EIO;
|
|
+ }
|
|
+
|
|
+done:
|
|
+ dev_info(host->dev, "V2 Successfully tuned phase to %d\n", degree);
|
|
+ priv->last_degree = degree;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int dw_mci_rk3288_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
|
|
{
|
|
struct dw_mci *host = slot->host;
|
|
@@ -157,6 +211,12 @@ static int dw_mci_rk3288_execute_tuning(
|
|
return -EIO;
|
|
}
|
|
|
|
+ if (priv->use_v2_tuning) {
|
|
+ if (!dw_mci_v2_execute_tuning(slot, opcode))
|
|
+ return 0;
|
|
+ /* Otherwise we continue using fine tuning */
|
|
+ }
|
|
+
|
|
ranges = kmalloc_array(priv->num_phases / 2 + 1,
|
|
sizeof(*ranges), GFP_KERNEL);
|
|
if (!ranges)
|
|
@@ -277,6 +337,9 @@ static int dw_mci_rk3288_parse_dt(struct
|
|
&priv->default_sample_phase))
|
|
priv->default_sample_phase = 0;
|
|
|
|
+ if (of_property_read_bool(np, "rockchip,use-v2-tuning"))
|
|
+ priv->use_v2_tuning = true;
|
|
+
|
|
priv->drv_clk = devm_clk_get(host->dev, "ciu-drive");
|
|
if (IS_ERR(priv->drv_clk))
|
|
dev_dbg(host->dev, "ciu-drive not available\n");
|