We're going to add interconnect support to the EMC driver. Once this
support will be added, the Tegra20 devfreq driver will no longer be
able to use clk_round_rate(emc) for building up OPP table. It's quite
handy that struct tegra_mc contains memory timings which could be used
by the devfreq drivers instead of the clk rate-rounding. The tegra_mc
timings are populated by the MC driver only for Tegra30+ SoCs, hence
the Tegra20 EMC could populate timings by itself.
Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
drivers/memory/tegra/tegra20-emc.c | 47 ++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/memory/tegra/tegra20-emc.c
b/drivers/memory/tegra/tegra20-emc.c
index 035d9251e28a..a95522020a25 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -15,12 +15,15 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/sort.h>
#include <linux/types.h>
#include <soc/tegra/fuse.h>
+#include "mc.h"
+
#define EMC_INTSTATUS 0x000
#define EMC_INTMASK 0x004
#define EMC_DBG 0x008
@@ -650,6 +653,38 @@ static void tegra_emc_debugfs_init(struct tegra_emc *emc)
emc, &tegra_emc_debug_max_rate_fops);
}
+static int tegra_emc_init_mc_timings(struct tegra_emc *emc)
+{
+ struct tegra_mc_timing *timing;
+ struct platform_device *pdev;
+ struct device_node *np;
+ struct tegra_mc *mc;
+ unsigned int i;
+
+ np = of_find_compatible_node(NULL, NULL, "nvidia,tegra20-mc-gart");
+ if (!np)
+ return -ENOENT;
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev)
+ return -ENOENT;
+
+ mc = platform_get_drvdata(pdev);
+ if (!mc)
+ return -EPROBE_DEFER;
+
+ mc->timings = devm_kcalloc(mc->dev, emc->num_timings, sizeof(*timing),
+ GFP_KERNEL);
+ if (!mc->timings)
+ return -ENOMEM;
+
+ for (i = 0; i < emc->num_timings; i++)
+ mc->timings[mc->num_timings++].rate = emc->timings[i].rate;
+
+ return 0;
+}
+
static int tegra_emc_probe(struct platform_device *pdev)
{
struct device_node *np;
@@ -705,6 +740,18 @@ static int tegra_emc_probe(struct platform_device *pdev)
return err;
}
+ /*
+ * Only Tegra30+ SoCs are having Memory Controller timings initialized
+ * by the MC driver. For Tegra20 we need to populate the MC timings
+ * from here. The MC timings will be used by the Tegra20 devfreq driver.
+ */
+ err = tegra_emc_init_mc_timings(emc);
+ if (err) {
+ dev_err(&pdev->dev, "failed to initialize mc timings: %d\n",
+ err);
+ return err;
+ }
+
tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
emc->clk = devm_clk_get(&pdev->dev, "emc");
--
2.26.0
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