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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0222-bcm2835-sdhost-Precalc-divisors-and-overclocks.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0222-bcm2835-sdhost-Precalc-divisors-and-overclocks.patch270
1 files changed, 0 insertions, 270 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0222-bcm2835-sdhost-Precalc-divisors-and-overclocks.patch b/target/linux/brcm2708/patches-4.4/0222-bcm2835-sdhost-Precalc-divisors-and-overclocks.patch
deleted file mode 100644
index a35c8b1e79..0000000000
--- a/target/linux/brcm2708/patches-4.4/0222-bcm2835-sdhost-Precalc-divisors-and-overclocks.patch
+++ /dev/null
@@ -1,270 +0,0 @@
-From 152daaa4a44dfa67ec4c975d0f3446b38fe047bd Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Thu, 31 Mar 2016 15:44:53 +0100
-Subject: [PATCH] bcm2835-sdhost: Precalc divisors and overclocks
-
-Recalculating the clock divisors when the core clock changes is wasteful
-and makes it harder to manage the overclock settings. Instead,
-precalculate them and only report significant changes.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- drivers/mmc/host/bcm2835-sdhost.c | 152 ++++++++++++++++++++++----------------
- 1 file changed, 88 insertions(+), 64 deletions(-)
-
---- a/drivers/mmc/host/bcm2835-sdhost.c
-+++ b/drivers/mmc/host/bcm2835-sdhost.c
-@@ -154,12 +154,15 @@ struct bcm2835_host {
- u32 pio_timeout; /* In jiffies */
-
- int clock; /* Current clock speed */
-+ int clocks[2];
-
- bool slow_card; /* Force 11-bit divisor */
-
- unsigned int max_clk; /* Max src clock freq */
-- unsigned int min_clk; /* Min src clock freq */
-- unsigned int cur_clk; /* Current src clock freq */
-+ unsigned int src_clks[2]; /* Min/max src clock freqs */
-+ unsigned int cur_clk_idx; /* Index of current clock */
-+ unsigned int next_clk_idx; /* Next clock index */
-+ unsigned int cdivs[2];
-
- struct tasklet_struct finish_tasklet; /* Tasklet structures */
-
-@@ -213,7 +216,7 @@ struct bcm2835_host {
- u32 delay_after_stop; /* minimum time between stop and subsequent data transfer */
- u32 delay_after_this_stop; /* minimum time between this stop and subsequent data transfer */
- u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */
-- u32 overclock; /* Current frequency if overclocked, else zero */
-+ u32 prev_overclock_50;
- u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
-
- u32 sectors; /* Cached card size in sectors */
-@@ -1509,10 +1512,35 @@ static irqreturn_t bcm2835_sdhost_irq(in
- return result;
- }
-
-+static void bcm2835_sdhost_select_clock(struct bcm2835_host *host, int idx)
-+{
-+ unsigned int clock = host->clocks[idx];
-+ unsigned int cdiv = host->cdivs[idx];
-+
-+ host->mmc->actual_clock = clock;
-+ host->ns_per_fifo_word = (1000000000/clock) *
-+ ((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
-+
-+ host->cdiv = cdiv;
-+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
-+
-+ /* Set the timeout to 500ms */
-+ bcm2835_sdhost_write(host, clock/2, SDTOUT);
-+
-+ host->cur_clk_idx = host->next_clk_idx = idx;
-+
-+ if (host->debug)
-+ pr_info("%s: clock=%d -> src_clk=%d, cdiv=%x (actual %d)\n",
-+ mmc_hostname(host->mmc), host->clock,
-+ host->src_clks[idx], host->cdiv,
-+ host->mmc->actual_clock);
-+}
-+
- void bcm2835_sdhost_set_clock(struct bcm2835_host *host)
- {
- int div = 0; /* Initialized for compiler warning */
- unsigned int clock = host->clock;
-+ int clk_idx;
-
- if (host->debug)
- pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
-@@ -1553,53 +1581,45 @@ void bcm2835_sdhost_set_clock(struct bcm
- return;
- }
-
-- div = host->cur_clk / clock;
-- if (div < 2)
-- div = 2;
-- if ((host->cur_clk / div) > clock)
-- div++;
-- div -= 2;
--
-- if (div > SDCDIV_MAX_CDIV)
-- div = SDCDIV_MAX_CDIV;
--
-- clock = host->cur_clk / (div + 2);
-- host->mmc->actual_clock = clock;
--
-- /* Calibrate some delays */
--
-- host->ns_per_fifo_word = (1000000000/clock) *
-- ((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
-+ /* Calculate the clock divisors */
-+ for (clk_idx = 0; clk_idx <= host->variable_clock; clk_idx++)
-+ {
-+ unsigned int cur_clk = host->src_clks[clk_idx];
-+ unsigned int actual_clock;
-
-- if (clock > host->clock) {
-- /* Save the closest value, to make it easier
-- to reduce in the event of error */
-- host->overclock_50 = (clock/MHZ);
--
-- if (clock != host->overclock) {
-- pr_warn("%s: overclocking to %dHz\n",
-- mmc_hostname(host->mmc), clock);
-- host->overclock = clock;
-+ div = cur_clk / clock;
-+ if (div < 2)
-+ div = 2;
-+ if ((cur_clk / div) > clock)
-+ div++;
-+ div -= 2;
-+
-+ if (div > SDCDIV_MAX_CDIV)
-+ div = SDCDIV_MAX_CDIV;
-+ actual_clock = cur_clk / (div + 2);
-+
-+ host->cdivs[clk_idx] = div;
-+ host->clocks[clk_idx] = actual_clock;
-+
-+ if (host->overclock_50 != host->prev_overclock_50) {
-+ const char *clk_name = "";
-+ if (host->variable_clock)
-+ clk_name = clk_idx ? " (turbo)" : " (normal)";
-+ if (actual_clock > host->clock)
-+ pr_info("%s: overclocking to %dHz%s\n",
-+ mmc_hostname(host->mmc),
-+ actual_clock, clk_name);
-+ else if ((host->overclock_50 < 50) && (clk_idx == 0))
-+ pr_info("%s: cancelling overclock%s\n",
-+ mmc_hostname(host->mmc),
-+ host->variable_clock ? "s" : "");
- }
- }
-- else if (host->overclock)
-- {
-- host->overclock = 0;
-- if (clock == 50 * MHZ)
-- pr_warn("%s: cancelling overclock\n",
-- mmc_hostname(host->mmc));
-- }
-
-- host->cdiv = div;
-- bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
-+ if (host->clock == 50*MHZ)
-+ host->prev_overclock_50 = host->overclock_50;
-
-- /* Set the timeout to 500ms */
-- bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT);
--
-- if (host->debug)
-- pr_info("%s: clock=%d -> cur_clk=%d, cdiv=%x (actual clock %d)\n",
-- mmc_hostname(host->mmc), host->clock,
-- host->cur_clk, host->cdiv, host->mmc->actual_clock);
-+ bcm2835_sdhost_select_clock(host, host->cur_clk_idx);
- }
-
- static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
-@@ -1657,6 +1677,9 @@ static void bcm2835_sdhost_request(struc
-
- spin_lock_irqsave(&host->lock, flags);
-
-+ if (host->next_clk_idx != host->cur_clk_idx)
-+ bcm2835_sdhost_select_clock(host, host->next_clk_idx);
-+
- WARN_ON(host->mrq != NULL);
- host->mrq = mrq;
-
-@@ -1719,11 +1742,7 @@ static int bcm2835_sdhost_cpufreq_callba
- return NOTIFY_BAD;
- break;
- case CPUFREQ_POSTCHANGE:
-- if (freq->new > freq->old)
-- host->cur_clk = host->max_clk;
-- else
-- host->cur_clk = host->min_clk;
-- bcm2835_sdhost_set_clock(host);
-+ host->next_clk_idx = (freq->new > freq->old);
- up(&host->cpufreq_semaphore);
- break;
- default:
-@@ -1763,8 +1782,11 @@ static void bcm2835_sdhost_set_ios(struc
- ios->clock, ios->power_mode, ios->bus_width,
- ios->timing, ios->signal_voltage, ios->drv_type);
-
-- if (ios->clock && !host->cur_clk)
-- host->cur_clk = get_core_clock(RPI_FIRMWARE_GET_CLOCK_RATE);
-+ if (ios->clock && (host->cur_clk_idx == -1)) {
-+ unsigned int cur_clk =
-+ get_core_clock(RPI_FIRMWARE_GET_CLOCK_RATE);
-+ host->cur_clk_idx = (cur_clk == host->src_clks[0]) ? 0 : 1;
-+ }
-
- spin_lock_irqsave(&host->lock, flags);
-
-@@ -1854,11 +1876,12 @@ static void bcm2835_sdhost_tasklet_finis
-
- /* Drop the overclock after any data corruption, or after any
- error overclocked */
-- if (host->overclock) {
-+ if (host->clock > 50*MHZ) {
- if ((mrq->cmd && mrq->cmd->error) ||
- (mrq->data && mrq->data->error) ||
- (mrq->stop && mrq->stop->error)) {
-- host->overclock_50--;
-+ host->overclock_50 = (host->clock/MHZ) - 1;
-+
- pr_warn("%s: reducing overclock due to errors\n",
- mmc_hostname(host->mmc));
- bcm2835_sdhost_set_clock(host);
-@@ -2022,7 +2045,7 @@ static int bcm2835_sdhost_probe(struct p
- struct bcm2835_host *host;
- struct mmc_host *mmc;
- const __be32 *addr;
-- unsigned int max_clk;
-+ unsigned int max_clk, min_clk;
- int ret;
-
- pr_debug("bcm2835_sdhost_probe\n");
-@@ -2128,12 +2151,8 @@ static int bcm2835_sdhost_probe(struct p
- else
- mmc->caps |= MMC_CAP_4_BIT_DATA;
-
-- ret = bcm2835_sdhost_add_host(host);
-- if (ret)
-- goto err;
--
- /* Query the core clock frequencies */
-- host->min_clk = get_core_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE);
-+ min_clk = get_core_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE);
- max_clk = get_core_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE);
- if (max_clk != host->max_clk) {
- pr_warn("%s: Expected max clock %d, found %d\n",
-@@ -2141,19 +2160,24 @@ static int bcm2835_sdhost_probe(struct p
- host->max_clk = max_clk;
- }
-
-- if (host->min_clk != host->max_clk) {
-+ host->src_clks[0] = min_clk;
-+ host->cur_clk_idx = -1;
-+ if (max_clk != min_clk) {
-+ host->src_clks[1] = max_clk;
- host->cpufreq_nb.notifier_call =
- bcm2835_sdhost_cpufreq_callback;
- sema_init(&host->cpufreq_semaphore, 1);
- cpufreq_register_notifier(&host->cpufreq_nb,
- CPUFREQ_TRANSITION_NOTIFIER);
- host->variable_clock = 1;
-- host->cur_clk = 0; /* Get this later */
- } else {
- host->variable_clock = 0;
-- host->cur_clk = host->max_clk;
- }
-
-+ ret = bcm2835_sdhost_add_host(host);
-+ if (ret)
-+ goto err;
-+
- platform_set_drvdata(pdev, host);
-
- pr_debug("bcm2835_sdhost_probe -> OK\n");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-21 19:19:23 +0000