[PATCH 18/20] video: msm: Prevent DMA lockups when switching bit depths
From: Carl Vanderlip <hidden>
Date: 2011-03-18 22:00:06
Also in:
linux-arm-kernel, linux-arm-msm, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Forces the lcdc off and waits a frame vsync period to prevent the MDP DMA engine crashing if the DMA bit depth is changed. A sleep cannot be used because lcdc_dma_start is called in irq context. Authors: Dima Zavin [off-list ref] Rebecca Schultz Zavin [off-list ref] Colin Cross [off-list ref] Signed-off-by: Carl Vanderlip <redacted> --- drivers/video/msm/mdp.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c
index b3f334ad..49d956a 100644
--- a/drivers/video/msm/mdp.c
+++ b/drivers/video/msm/mdp.c@@ -564,6 +564,13 @@ void mdp_hw_init(struct mdp_info *mdp) mdp_writel(mdp, 1, 0x60); mdp_writel(mdp, 1, MDP_EBI2_PORTMAP_MODE); + /* disable lcdc */ + mdp_writel(mdp, 0, MDP_LCDC_CTL); + /* enable auto clock gating for all blocks by default */ + mdp_writel(mdp, 0xffffffff, MDP_CGC_EN); + /* reset color/gamma correct parms */ + mdp_writel(mdp, 0, MDP_DMA_P_COLOR_CORRECT_CONFIG); + mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01f8); mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01fc); mdp_writel(mdp, 1, 0x60);
--
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