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| Started by | Petr Cvek <petr.cvek@tul.cz> |
|---|---|
| First post | 2015-09-28 23:20 +0200 |
| Last post | 2015-10-03 14:40 +0200 |
| Articles | 2 — 2 participants |
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[PATCH v4 09/26] ARM: pxa: magician: Optimize powerup delays for Samsung LCD Petr Cvek <petr.cvek@tul.cz> - 2015-09-28 23:20 +0200
Re: [PATCH v4 09/26] ARM: pxa: magician: Optimize powerup delays for Samsung LCD Philipp Zabel <philipp.zabel@gmail.com> - 2015-10-03 14:40 +0200
| From | Petr Cvek <petr.cvek@tul.cz> |
|---|---|
| Date | 2015-09-28 23:20 +0200 |
| Subject | [PATCH v4 09/26] ARM: pxa: magician: Optimize powerup delays for Samsung LCD |
| Message-ID | <qdO05-2Tc-73@gated-at.bofh.it> |
Delays for the Samsung LCD are greater than needed. These values were
extracted from a datasheet.
Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
---
arch/arm/mach-pxa/magician.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c
index d78fc3a..14d1f55 100644
--- a/arch/arm/mach-pxa/magician.c
+++ b/arch/arm/mach-pxa/magician.c
@@ -366,21 +366,19 @@ static void samsung_lcd_power(int on, struct fb_var_screeninfo *si)
gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 1);
else
gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 1);
- mdelay(10);
+ mdelay(6);
gpio_set_value(GPIO106_MAGICIAN_LCD_DCDC_NRESET, 1);
- mdelay(10);
+ mdelay(6); /* Avdd -> Voff >5ms */
gpio_set_value(GPIO104_MAGICIAN_LCD_VOFF_EN, 1);
- mdelay(30);
+ mdelay(16); /* Voff -> Von >(5+10)ms */
gpio_set_value(GPIO105_MAGICIAN_LCD_VON_EN, 1);
- mdelay(10);
} else {
- mdelay(10);
gpio_set_value(GPIO105_MAGICIAN_LCD_VON_EN, 0);
- mdelay(30);
+ mdelay(16);
gpio_set_value(GPIO104_MAGICIAN_LCD_VOFF_EN, 0);
- mdelay(10);
+ mdelay(6);
gpio_set_value(GPIO106_MAGICIAN_LCD_DCDC_NRESET, 0);
- mdelay(10);
+ mdelay(6);
if (system_rev < 3)
gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 0);
else
--
1.7.12.1
--
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| From | Philipp Zabel <philipp.zabel@gmail.com> |
|---|---|
| Date | 2015-10-03 14:40 +0200 |
| Subject | Re: [PATCH v4 09/26] ARM: pxa: magician: Optimize powerup delays for Samsung LCD |
| Message-ID | <qfugx-1TL-13@gated-at.bofh.it> |
| In reply to | #1234494 |
Am Montag, den 28.09.2015, 23:16 +0200 schrieb Petr Cvek: > Delays for the Samsung LCD are greater than needed. These values were > extracted from a datasheet. > > Signed-off-by: Petr Cvek <petr.cvek@tul.cz> Acked-by: Philipp Zabel <philipp.zabel@gmail.com> regards Philipp -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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