forked from len0rd/rockbox
Fixes and improvements for FS#9890 - iPod 5G: LCD sleep, BCM shutdown and bootstrap
* Ensure LCD is updated if lcd_update() is called while the LCD is initializing * Turn on BCM and LCD in lcd_init_device() if it is off * Speed up lcd_awake() * Shorten minimum length of time BCM must stay off and fix related code git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20695 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Boris Gjenero
parent
7ed1a5f120
commit
73e1bad355
2 changed files with 66 additions and 35 deletions
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@ -57,6 +57,8 @@
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/* Time until the BCM is considered stalled and will be re-kicked.
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* Must be guaranteed to be >~ 20ms. */
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#define BCM_UPDATE_TIMEOUT (HZ/20)
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/* An LCD update command done while the LCD is off needs >~ 200ms */
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#define BCM_LCDINIT_TIMEOUT (HZ/2)
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/* Addresses within BCM */
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#define BCMA_SRAM_BASE 0
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@ -92,7 +94,7 @@ enum lcd_status {
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};
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struct {
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long update_timeout;
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long update_timeout; /* also used to ensure BCM stays off for >= 50 ms */
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enum lcd_status state;
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bool blocked;
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#if NUM_CORES > 1
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@ -100,11 +102,12 @@ struct {
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#endif
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#ifdef HAVE_LCD_SLEEP
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bool display_on;
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bool waking;
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struct wakeup initwakeup;
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#endif
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} lcd_state IBSS_ATTR;
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#ifdef HAVE_LCD_SLEEP
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static long bcm_off_wait;
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const fb_data *flash_vmcs_offset;
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unsigned flash_vmcs_length;
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/* This mutex exists because enabling the backlight by changing a setting
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@ -179,6 +182,12 @@ static inline unsigned bcm_read32(unsigned address)
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return BCM_DATA32; /* read value */
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}
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static void continue_lcd_awake(void)
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{
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lcd_state.waking = false;
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wakeup_signal(&(lcd_state.initwakeup));
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}
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#ifndef BOOTLOADER
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static void lcd_tick(void)
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{
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@ -201,11 +210,15 @@ static void lcd_tick(void)
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BCM_CONTROL = 0x31;
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lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
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lcd_state.state = LCD_UPDATING;
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if (lcd_state.waking)
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continue_lcd_awake();
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}
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else if ((lcd_state.state == LCD_UPDATING) && !bcm_is_busy)
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{
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/* Update finished properly and no new update pending. */
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lcd_state.state = LCD_IDLE;
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if (lcd_state.waking)
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continue_lcd_awake();
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}
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}
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#if NUM_CORES > 1
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@ -246,6 +259,8 @@ static void lcd_unblock_and_update(void)
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BCM_CONTROL = 0x31;
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lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
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lcd_state.state = LCD_UPDATING;
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if (lcd_state.waking)
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continue_lcd_awake();
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}
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else
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{
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@ -309,10 +324,7 @@ void lcd_init_device(void)
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/* These port initializations are supposed to be done when initializing
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the BCM. None of it is changed when shutting down the BCM.
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*/
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GPO32_ENABLE |= 0x4000;
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/* GPO32_VAL & 0x8000 may supply power for BCM sleep state */
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GPO32_ENABLE |= 0x8000;
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GPO32_VAL &= ~0x8000;
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GPO32_ENABLE |= 0xC000;
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GPIO_CLEAR_BITWISE(GPIOC_ENABLE, 0x80);
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/* This pin is used for BCM interrupts */
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GPIOC_ENABLE |= 0x40;
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@ -326,7 +338,6 @@ void lcd_init_device(void)
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corelock_init(&lcd_state.cl);
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#endif
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#ifdef HAVE_LCD_SLEEP
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lcd_state.display_on = true; /* Code in flash turned it on */
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if (!flash_get_section(ROM_ID('v', 'm', 'c', 's'),
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(void **)(&flash_vmcs_offset), &flash_vmcs_length))
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/* BCM cannot be shut down because firmware wasn't found */
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@ -336,8 +347,27 @@ void lcd_init_device(void)
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flash_vmcs_length = ((flash_vmcs_length + 3) >> 1) & ~1;
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}
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mutex_init(&lcdstate_lock);
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#endif
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wakeup_init(&(lcd_state.initwakeup));
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lcd_state.waking = false;
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if (GPO32_VAL & 0x4000)
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{
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/* BCM is powered. Assume it is initialized. */
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lcd_state.display_on = true;
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tick_add_task(&lcd_tick);
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}
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else
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{
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/* BCM is not powered, so it needs to be initialized.
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This can only happen when loading Rockbox via ROLO.
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*/
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lcd_state.update_timeout = current_tick;
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lcd_state.display_on = false;
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lcd_awake();
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}
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#else /* !HAVE_LCD_SLEEP */
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tick_add_task(&lcd_tick);
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#endif
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#endif /* !BOOTLOADER */
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}
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@ -495,9 +525,7 @@ void bcm_init(void)
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/* Power up BCM */
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GPO32_VAL |= 0x4000;
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/* Changed from HZ/2 to speed up this function */
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sleep(HZ/8);
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sleep(HZ/20);
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/* Bootstrap stage 1 */
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@ -511,7 +539,10 @@ void bcm_init(void)
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*/
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/* Bootstrap stage 2 */
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while (BCM_ALT_CONTROL & 0x80);
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while (!(BCM_ALT_CONTROL & 0x40));
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for (i = 0; i < 8; i++) {
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BCM_CONTROL = bcm_bootstrapdata[i];
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}
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@ -520,19 +551,15 @@ void bcm_init(void)
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BCM_ALT_CONTROL = bcm_bootstrapdata[i];
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}
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while ((BCM_RD_ADDR & 1) == 0 || (BCM_ALT_RD_ADDR & 1) == 0)
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yield();
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while ((BCM_RD_ADDR & 1) == 0 || (BCM_ALT_RD_ADDR & 1) == 0);
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(void)BCM_WR_ADDR;
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(void)BCM_ALT_WR_ADDR;
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/* Bootstrap stage 3: upload firmware */
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while (BCM_ALT_CONTROL & 0x80)
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yield();
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while (!(BCM_ALT_CONTROL & 0x40))
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yield();
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while (BCM_ALT_CONTROL & 0x80);
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while (!(BCM_ALT_CONTROL & 0x40));
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/* Upload firmware to BCM SRAM */
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bcm_write_addr(BCMA_SRAM_BASE);
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@ -541,8 +568,7 @@ void bcm_init(void)
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bcm_write32(BCMA_COMMAND, 0);
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bcm_write32(0x10000C00, 0xC0000000);
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while (!(bcm_read32(0x10000C00) & 1))
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yield();
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while (!(bcm_read32(0x10000C00) & 1));
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bcm_write32(0x10000C00, 0);
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bcm_write32(0x10000400, 0xA5A50002);
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@ -558,23 +584,26 @@ void lcd_awake(void)
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mutex_lock(&lcdstate_lock);
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if (!lcd_state.display_on && flash_vmcs_length != 0)
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{
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/* Ensure BCM has been off for 1/2 s at least */
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while (!TIME_AFTER(current_tick, lcd_state.update_timeout))
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yield();
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/* Ensure BCM has been off for >= 50 ms */
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long sleepwait = lcd_state.update_timeout + HZ/20 - current_tick;
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if (sleepwait > 0 && sleepwait < HZ/20)
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sleep(sleepwait);
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bcm_init();
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/* Update LCD, but don't use lcd_update(). Instead, wait here
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until the command completes so LCD isn't white when the
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backlight turns on
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*/
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bcm_write_addr(BCMA_CMDPARAM);
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lcd_write_data(&(lcd_framebuffer[0][0]), LCD_WIDTH * LCD_HEIGHT);
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bcm_command(BCMCMD_LCD_UPDATE);
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/* Start the first LCD update, which also initializes the LCD */
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lcd_state.state = LCD_INITIAL;
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tick_add_task(&lcd_tick);
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lcd_state.display_on = true;
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lcd_update();
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lcd_state.update_timeout = current_tick + BCM_LCDINIT_TIMEOUT;
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/* Wait for end of first LCD update, so LCD isn't white
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when the backlight turns on.
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*/
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lcd_state.waking = true;
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tick_add_task(&lcd_tick);
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wakeup_wait(&(lcd_state.initwakeup), TIMEOUT_BLOCK);
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lcd_activation_call_hook();
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}
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mutex_unlock(&lcdstate_lock);
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@ -592,7 +621,9 @@ void lcd_sleep(void)
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tick_remove_task(&lcd_tick);
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bcm_powerdown();
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bcm_off_wait = current_tick + HZ/2;
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/* Remember time to ensure BCM stays off for >= 50 ms */
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lcd_state.update_timeout = current_tick;
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}
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mutex_unlock(&lcdstate_lock);
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}
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