diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2019-08-12 00:00:31 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2019-11-11 16:55:25 +0300 |
| commit | 77ab499dca5d7426a84f76988b3f84e7c9db7e12 (patch) | |
| tree | 4124d510d4dd3f7bf789c6aeff5d3fdd530ba030 /drivers/memory | |
| parent | fa6749d40e99d3e780b60f2a2e0a3ad97af45b3c (diff) | |
| download | linux-77ab499dca5d7426a84f76988b3f84e7c9db7e12.tar.xz | |
memory: tegra: Adapt for Tegra20 clock driver changes
Now Tegra20 and Tegra30 EMC drivers should provide clock-rounding
functionality using the new Tegra clock driver API.
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/tegra/tegra20-emc.c | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index da8fa592b071..b519f02b0ee9 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -6,6 +6,7 @@ */ #include <linux/clk.h> +#include <linux/clk/tegra.h> #include <linux/completion.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -421,6 +422,44 @@ static int emc_setup_hw(struct tegra_emc *emc) return 0; } +static long emc_round_rate(unsigned long rate, + unsigned long min_rate, + unsigned long max_rate, + void *arg) +{ + struct emc_timing *timing = NULL; + struct tegra_emc *emc = arg; + unsigned int i; + + min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate); + + for (i = 0; i < emc->num_timings; i++) { + if (emc->timings[i].rate < rate && i != emc->num_timings - 1) + continue; + + if (emc->timings[i].rate > max_rate) { + i = max(i, 1u) - 1; + + if (emc->timings[i].rate < min_rate) + break; + } + + if (emc->timings[i].rate < min_rate) + continue; + + timing = &emc->timings[i]; + break; + } + + if (!timing) { + dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n", + rate, min_rate, max_rate); + return -EINVAL; + } + + return timing->rate; +} + static int tegra_emc_probe(struct platform_device *pdev) { struct device_node *np; @@ -477,21 +516,28 @@ static int tegra_emc_probe(struct platform_device *pdev) return err; } + tegra20_clk_set_emc_round_callback(emc_round_rate, emc); + emc->clk = devm_clk_get(&pdev->dev, "emc"); if (IS_ERR(emc->clk)) { err = PTR_ERR(emc->clk); dev_err(&pdev->dev, "failed to get emc clock: %d\n", err); - return err; + goto unset_cb; } err = clk_notifier_register(emc->clk, &emc->clk_nb); if (err) { dev_err(&pdev->dev, "failed to register clk notifier: %d\n", err); - return err; + goto unset_cb; } return 0; + +unset_cb: + tegra20_clk_set_emc_round_callback(NULL, NULL); + + return err; } static const struct of_device_id tegra_emc_of_match[] = { |