From: Sean Paul Date: Wed, 17 Aug 2016 00:47:17 +0000 (-0700) Subject: drm/rockchip: A couple small fixes to psr X-Git-Tag: v4.9-rc1~41^2~37^2~3 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=46bdc64984709419de3f42d3e8b62684af571516;p=karo-tx-linux.git drm/rockchip: A couple small fixes to psr A few things that need tidying up, no functional changes. Reviewed-by: Yakir Yang Signed-off-by: Sean Paul --- diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c index 5bd54f2c6ce1..c6ac5d01c8e4 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c @@ -62,27 +62,25 @@ static void psr_set_state_locked(struct psr_drv *psr, enum psr_state state) * Allowed finite state machine: * * PSR_ENABLE < = = = = = > PSR_FLUSH - * | ^ | - * | | | - * v | | + * | ^ | + * | | | + * v | | * PSR_DISABLE < - - - - - - - - - */ - - /* Forbid no state change */ if (state == psr->state) return; - /* Forbid DISABLE change to FLUSH */ + /* Requesting a flush when disabled is a noop */ if (state == PSR_FLUSH && psr->state == PSR_DISABLE) return; psr->state = state; - /* Allow but no need hardware change, just need assign the state */ + /* Already disabled in flush, change the state, but not the hardware */ if (state == PSR_DISABLE && psr->state == PSR_FLUSH) return; - /* Refact to hardware state change */ + /* Actually commit the state change to hardware */ switch (psr->state) { case PSR_ENABLE: psr->set(psr->encoder, true); @@ -109,10 +107,7 @@ static void psr_flush_handler(unsigned long data) struct psr_drv *psr = (struct psr_drv *)data; unsigned long flags; - if (!psr) - return; - - /* State changed between flush time, then keep it */ + /* If the state has changed since we initiated the flush, do nothing */ spin_lock_irqsave(&psr->lock, flags); if (psr->state == PSR_FLUSH) psr_set_state_locked(psr, PSR_ENABLE);