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drm: mali-dp: Clear CVAL when leaving config mode 

It's possible for CVAL to get set whilst we are in config mode. If this
happens, afer we leave config mode the HW will latch whatever
configuration is in the registers at the next vsync. Most likely this
will be a partial configuration, as we'll be racing against the ongoing
atomic_commit.

To avoid this, clear CVAL before leaving config mode.

Signed-off-by: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
This commit is contained in:
Brian Starkey 2016-11-08 11:36:14 +00:00 committed by Liviu Dudau
parent ed8b0c0f93
commit e64053f05e
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/arm/malidp_hw.c
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@ -125,6 +125,7 @@ static void malidp500_leave_config_mode(struct malidp_hw_device *hwdev)
{
u32 status, count = 100;
malidp_hw_clearbits(hwdev, MALIDP_CFG_VALID, MALIDP500_CONFIG_VALID);
malidp_hw_clearbits(hwdev, MALIDP500_DC_CONFIG_REQ, MALIDP500_DC_CONTROL);
while (count) {
status = malidp_hw_read(hwdev, hwdev->map.dc_base + MALIDP_REG_STATUS);
@ -266,6 +267,7 @@ static void malidp550_leave_config_mode(struct malidp_hw_device *hwdev)
{
u32 status, count = 100;
malidp_hw_clearbits(hwdev, MALIDP_CFG_VALID, MALIDP550_CONFIG_VALID);
malidp_hw_clearbits(hwdev, MALIDP550_DC_CONFIG_REQ, MALIDP550_DC_CONTROL);
while (count) {
status = malidp_hw_read(hwdev, hwdev->map.dc_base + MALIDP_REG_STATUS);