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authorWolfram Sang <wsa+renesas@sang-engineering.com>2016-01-04 03:33:45 +0100
committerWolfram Sang <wsa@the-dreams.de>2016-02-02 15:37:49 +0100
commitd0be8584b01160eb6f49e77f8e9c1da286bb4ffb (patch)
tree0a4348c99c2b47e324e16b028fdd860ee864098b /drivers/gpu/drm/i2c
parent1df59b8497f47495e873c23abd6d3d290c730505 (diff)
downloadlinux-d0be8584b01160eb6f49e77f8e9c1da286bb4ffb.tar.bz2
drm: adv7511: really enable interrupts for EDID detection
The interrupts for EDID_READY or DDC_ERROR were never enabled in this driver, so reading EDID always timed out when chip was powered down and interrupts were used. Fix this and also remove clearing the interrupt flags, they are cleared in POWER_DOWN mode anyhow (unlike the interrupt enable flags) according to docs and my tests. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Archit Taneja <architt@codeaurora.org>
Diffstat (limited to 'drivers/gpu/drm/i2c')
-rw-r--r--drivers/gpu/drm/i2c/adv7511.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
index 533d1e3d4a99..db7435a4517f 100644
--- a/drivers/gpu/drm/i2c/adv7511.c
+++ b/drivers/gpu/drm/i2c/adv7511.c
@@ -362,12 +362,19 @@ static void adv7511_power_on(struct adv7511 *adv7511)
{
adv7511->current_edid_segment = -1;
- regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
- ADV7511_INT0_EDID_READY);
- regmap_write(adv7511->regmap, ADV7511_REG_INT(1),
- ADV7511_INT1_DDC_ERROR);
regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
ADV7511_POWER_POWER_DOWN, 0);
+ if (adv7511->i2c_main->irq) {
+ /*
+ * Documentation says the INT_ENABLE registers are reset in
+ * POWER_DOWN mode. My 7511w preserved the bits, however.
+ * Still, let's be safe and stick to the documentation.
+ */
+ regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
+ ADV7511_INT0_EDID_READY);
+ regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
+ ADV7511_INT1_DDC_ERROR);
+ }
/*
* Per spec it is allowed to pulse the HDP signal to indicate that the
@@ -567,12 +574,14 @@ static int adv7511_get_modes(struct drm_encoder *encoder,
/* Reading the EDID only works if the device is powered */
if (!adv7511->powered) {
- regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
- ADV7511_INT0_EDID_READY);
- regmap_write(adv7511->regmap, ADV7511_REG_INT(1),
- ADV7511_INT1_DDC_ERROR);
regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
ADV7511_POWER_POWER_DOWN, 0);
+ if (adv7511->i2c_main->irq) {
+ regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
+ ADV7511_INT0_EDID_READY);
+ regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
+ ADV7511_INT1_DDC_ERROR);
+ }
adv7511->current_edid_segment = -1;
}