mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
3fc661a98c
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also alphabetically order sound-soc kernel packages. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
227 lines
6.5 KiB
Diff
227 lines
6.5 KiB
Diff
From b14e4255f43ccf38b4f9df8f5793c9c4098e0ab9 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Mon, 4 Apr 2016 16:03:18 +0100
|
|
Subject: [PATCH 225/381] bcm2835-sdhost: Firmware manages the clock divisor
|
|
|
|
The bcm2835-sdhost driver hands control of the CDIV clock divisor
|
|
register to matching firmware, allowing it to adjust to a changing
|
|
core clock. This removes the need to use the performance governor or
|
|
to enable io_is_busy on the on-demand governor in order to get the
|
|
best SD performance.
|
|
|
|
N.B. As SD clocks must be an integer divisor of the core clock, it is
|
|
possible that the SD clock for "turbo" mode can be different (even
|
|
lower) than "normal" mode.
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
drivers/mmc/host/bcm2835-sdhost.c | 120 ++++++++++++++++++-----------
|
|
include/soc/bcm2835/raspberrypi-firmware.h | 1 +
|
|
2 files changed, 74 insertions(+), 47 deletions(-)
|
|
|
|
--- a/drivers/mmc/host/bcm2835-sdhost.c
|
|
+++ b/drivers/mmc/host/bcm2835-sdhost.c
|
|
@@ -50,6 +50,7 @@
|
|
#include <linux/of_dma.h>
|
|
#include <linux/time.h>
|
|
#include <linux/workqueue.h>
|
|
+#include <soc/bcm2835/raspberrypi-firmware.h>
|
|
|
|
#define DRIVER_NAME "sdhost-bcm2835"
|
|
|
|
@@ -183,6 +184,7 @@ struct bcm2835_host {
|
|
unsigned int use_sbc:1; /* Send CMD23 */
|
|
|
|
unsigned int debug:1; /* Enable debug output */
|
|
+ unsigned int firmware_sets_cdiv:1; /* Let the firmware manage the clock */
|
|
|
|
/*DMA part*/
|
|
struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */
|
|
@@ -430,7 +432,7 @@ static void bcm2835_sdhost_reset_interna
|
|
host->clock = 0;
|
|
host->sectors = 0;
|
|
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
|
|
- bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
|
|
+ bcm2835_sdhost_write(host, SDCDIV_MAX_CDIV, SDCDIV);
|
|
mmiowb();
|
|
}
|
|
|
|
@@ -1534,62 +1536,75 @@ void bcm2835_sdhost_set_clock(struct bcm
|
|
|
|
host->mmc->actual_clock = 0;
|
|
|
|
- if (clock < 100000) {
|
|
- /* Can't stop the clock, but make it as slow as possible
|
|
- * to show willing
|
|
- */
|
|
- host->cdiv = SDCDIV_MAX_CDIV;
|
|
- bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
|
|
- return;
|
|
- }
|
|
-
|
|
- div = host->max_clk / clock;
|
|
- if (div < 2)
|
|
- div = 2;
|
|
- if ((host->max_clk / div) > clock)
|
|
- div++;
|
|
- div -= 2;
|
|
+ if (host->firmware_sets_cdiv) {
|
|
+ u32 msg[3] = { clock, 0, 0 };
|
|
|
|
- if (div > SDCDIV_MAX_CDIV)
|
|
- div = SDCDIV_MAX_CDIV;
|
|
+ rpi_firmware_property(rpi_firmware_get(NULL),
|
|
+ RPI_FIRMWARE_SET_SDHOST_CLOCK,
|
|
+ &msg, sizeof(msg));
|
|
|
|
- clock = host->max_clk / (div + 2);
|
|
- host->mmc->actual_clock = clock;
|
|
+ clock = max(msg[1], msg[2]);
|
|
+ } else {
|
|
+ if (clock < 100000) {
|
|
+ /* Can't stop the clock, but make it as slow as
|
|
+ * possible to show willing
|
|
+ */
|
|
+ host->cdiv = SDCDIV_MAX_CDIV;
|
|
+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ div = host->max_clk / clock;
|
|
+ if (div < 2)
|
|
+ div = 2;
|
|
+ if ((host->max_clk / div) > clock)
|
|
+ div++;
|
|
+ div -= 2;
|
|
+
|
|
+ if (div > SDCDIV_MAX_CDIV)
|
|
+ div = SDCDIV_MAX_CDIV;
|
|
+
|
|
+ clock = host->max_clk / (div + 2);
|
|
+
|
|
+ host->cdiv = div;
|
|
+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
|
|
+
|
|
+ if (host->debug)
|
|
+ pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x "
|
|
+ "(actual clock %d)\n",
|
|
+ mmc_hostname(host->mmc), input_clock,
|
|
+ host->max_clk, host->cdiv,
|
|
+ clock);
|
|
+ }
|
|
|
|
/* Calibrate some delays */
|
|
|
|
host->ns_per_fifo_word = (1000000000/clock) *
|
|
((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
|
|
|
|
- if (clock > input_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;
|
|
+ if (input_clock == 50 * MHZ) {
|
|
+ if (clock > input_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;
|
|
+ }
|
|
+ } else if (host->overclock) {
|
|
+ host->overclock = 0;
|
|
+ if (clock == 50 * MHZ)
|
|
+ pr_warn("%s: cancelling overclock\n",
|
|
+ mmc_hostname(host->mmc));
|
|
}
|
|
}
|
|
- 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);
|
|
|
|
/* Set the timeout to 500ms */
|
|
- bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT);
|
|
+ bcm2835_sdhost_write(host, clock/2, SDTOUT);
|
|
|
|
- if (host->debug)
|
|
- pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n",
|
|
- mmc_hostname(host->mmc), input_clock,
|
|
- host->max_clk, host->cdiv, host->mmc->actual_clock);
|
|
+ host->mmc->actual_clock = clock;
|
|
}
|
|
|
|
static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
@@ -1704,11 +1719,6 @@ static void bcm2835_sdhost_set_ios(struc
|
|
|
|
log_event("IOS<", ios->clock, 0);
|
|
|
|
- if (!ios->clock || ios->clock != host->clock) {
|
|
- bcm2835_sdhost_set_clock(host, ios->clock);
|
|
- host->clock = ios->clock;
|
|
- }
|
|
-
|
|
/* set bus width */
|
|
host->hcfg &= ~SDHCFG_WIDE_EXT_BUS;
|
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
@@ -1721,6 +1731,11 @@ static void bcm2835_sdhost_set_ios(struc
|
|
|
|
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
|
|
|
|
+ if (!ios->clock || ios->clock != host->clock) {
|
|
+ bcm2835_sdhost_set_clock(host, ios->clock);
|
|
+ host->clock = ios->clock;
|
|
+ }
|
|
+
|
|
mmiowb();
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
@@ -1953,6 +1968,7 @@ static int bcm2835_sdhost_probe(struct p
|
|
struct bcm2835_host *host;
|
|
struct mmc_host *mmc;
|
|
const __be32 *addr;
|
|
+ u32 msg[3];
|
|
int ret;
|
|
|
|
pr_debug("bcm2835_sdhost_probe\n");
|
|
@@ -2058,6 +2074,16 @@ static int bcm2835_sdhost_probe(struct p
|
|
else
|
|
mmc->caps |= MMC_CAP_4_BIT_DATA;
|
|
|
|
+ msg[0] = 0;
|
|
+ msg[1] = ~0;
|
|
+ msg[2] = ~0;
|
|
+
|
|
+ rpi_firmware_property(rpi_firmware_get(NULL),
|
|
+ RPI_FIRMWARE_SET_SDHOST_CLOCK,
|
|
+ &msg, sizeof(msg));
|
|
+
|
|
+ host->firmware_sets_cdiv = (msg[1] != ~0);
|
|
+
|
|
ret = bcm2835_sdhost_add_host(host);
|
|
if (ret)
|
|
goto err;
|
|
--- a/include/soc/bcm2835/raspberrypi-firmware.h
|
|
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
|
|
@@ -79,6 +79,7 @@ enum rpi_firmware_property_tag {
|
|
RPI_FIRMWARE_SET_VOLTAGE = 0x00038003,
|
|
RPI_FIRMWARE_SET_TURBO = 0x00038009,
|
|
RPI_FIRMWARE_SET_CUSTOMER_OTP = 0x00038021,
|
|
+ RPI_FIRMWARE_SET_SDHOST_CLOCK = 0x00038042,
|
|
|
|
/* Dispmanx TAGS */
|
|
RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001,
|