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[media] au0828: rework GPIO management for HVR-950q

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Restructure the way we bring the various GPIOs out of reset.  In particular:

1.  we only need to setup the GPIOs as outputs once
2.  there's no point in writing 0x40 to register 0x00 since that's the EEPROM
    write protect and already it's configured as an input
3.  Separate out the act of enabling the power supply and bringing the tuner
    and demod out of reset.  If you don't then the chip may not be properly
    enabled (as the power supply is still ramping up when the chip comes
    out of reset).  This can result in probing failures.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Devin Heitmueller 2013-08-19 18:25:16 -03:00 committed by Mauro Carvalho Chehab
parent b59de95bed
commit a06b429df4
1 changed files with 14 additions and 7 deletions
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21
drivers/media/usb/au0828/au0828-cards.c
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@ -270,18 +270,25 @@ void au0828_gpio_setup(struct au0828_dev *dev)
* 9 - XC5000 Tuner
*/
/* Into reset */
/* Set relevant GPIOs as outputs (leave the EEPROM W/P
as an input since we will never touch it and it has
a pullup) */
au0828_write(dev, REG_003, 0x02);
au0828_write(dev, REG_002, 0x80 | 0x20 | 0x10);
/* Into reset */
au0828_write(dev, REG_001, 0x0);
au0828_write(dev, REG_000, 0x0);
msleep(100);
msleep(50);
/* Out of reset (leave the cs5340 in reset until needed) */
au0828_write(dev, REG_003, 0x02);
au0828_write(dev, REG_001, 0x02);
au0828_write(dev, REG_002, 0x80 | 0x20 | 0x10);
au0828_write(dev, REG_000, 0x80 | 0x40 | 0x20);
/* Bring power supply out of reset */
au0828_write(dev, REG_000, 0x80);
msleep(50);
/* Bring xc5000 and au8522 out of reset (leave the
cs5340 in reset until needed) */
au0828_write(dev, REG_001, 0x02); /* xc5000 */
au0828_write(dev, REG_000, 0x80 | 0x20); /* PS + au8522 */
msleep(250);
break;