From 7c269f454e7a51b151d94f99344120efa1cd0acb Mon Sep 17 00:00:00 2001 From: Libin Yang Date: Wed, 3 Jul 2013 01:56:00 -0300 Subject: [PATCH] [media] marvell-ccic: reset ccic phy when stop streaming for stability This patch adds the reset ccic phy operation when stop streaming. Stop streaming without reset ccic phy, the next start streaming may be unstable. Also need add CCIC2 definition when PXA688/PXA2128 support dual ccics. Signed-off-by: Albert Wang Signed-off-by: Libin Yang Acked-by: Jonathan Corbet Acked-by: Guennadi Liakhovetski Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- .../media/platform/marvell-ccic/mcam-core.c | 6 +++++ .../media/platform/marvell-ccic/mcam-core.h | 2 ++ .../media/platform/marvell-ccic/mmp-driver.c | 25 +++++++++++++++++++ 3 files changed, 33 insertions(+) diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c index a256804ec40c..56d489bab39b 100644 --- a/drivers/media/platform/marvell-ccic/mcam-core.c +++ b/drivers/media/platform/marvell-ccic/mcam-core.c @@ -1040,6 +1040,12 @@ static int mcam_vb_stop_streaming(struct vb2_queue *vq) if (cam->state != S_STREAMING) return -EINVAL; mcam_ctlr_stop_dma(cam); + /* + * Reset the CCIC PHY after stopping streaming, + * otherwise, the CCIC may be unstable. + */ + if (cam->ctlr_reset) + cam->ctlr_reset(cam); /* * VB2 reclaims the buffers, so we need to forget * about them. diff --git a/drivers/media/platform/marvell-ccic/mcam-core.h b/drivers/media/platform/marvell-ccic/mcam-core.h index 0de7e5fda836..39c6786ef83a 100644 --- a/drivers/media/platform/marvell-ccic/mcam-core.h +++ b/drivers/media/platform/marvell-ccic/mcam-core.h @@ -115,6 +115,7 @@ struct mcam_camera { int mclk_src; /* which clock source the mclk derives from */ int mclk_div; /* Clock Divider Value for MCLK */ + int ccic_id; enum v4l2_mbus_type bus_type; /* MIPI support */ /* The dphy config value, allocated in board file @@ -135,6 +136,7 @@ struct mcam_camera { int (*plat_power_up) (struct mcam_camera *cam); void (*plat_power_down) (struct mcam_camera *cam); void (*calc_dphy) (struct mcam_camera *cam); + void (*ctlr_reset) (struct mcam_camera *cam); /* * Everything below here is private to the mcam core and diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c index e7be4109797c..3665fbbf9ee7 100644 --- a/drivers/media/platform/marvell-ccic/mmp-driver.c +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c @@ -105,6 +105,7 @@ static struct mmp_camera *mmpcam_find_device(struct platform_device *pdev) #define CPU_SUBSYS_PMU_BASE 0xd4282800 #define REG_CCIC_DCGCR 0x28 /* CCIC dyn clock gate ctrl reg */ #define REG_CCIC_CRCR 0x50 /* CCIC clk reset ctrl reg */ +#define REG_CCIC2_CRCR 0xf4 /* CCIC2 clk reset ctrl reg */ static void mcam_clk_enable(struct mcam_camera *mcam) { @@ -194,6 +195,28 @@ static void mmpcam_power_down(struct mcam_camera *mcam) mcam_clk_disable(mcam); } +void mcam_ctlr_reset(struct mcam_camera *mcam) +{ + unsigned long val; + struct mmp_camera *cam = mcam_to_cam(mcam); + + if (mcam->ccic_id) { + /* + * Using CCIC2 + */ + val = ioread32(cam->power_regs + REG_CCIC2_CRCR); + iowrite32(val & ~0x2, cam->power_regs + REG_CCIC2_CRCR); + iowrite32(val | 0x2, cam->power_regs + REG_CCIC2_CRCR); + } else { + /* + * Using CCIC1 + */ + val = ioread32(cam->power_regs + REG_CCIC_CRCR); + iowrite32(val & ~0x2, cam->power_regs + REG_CCIC_CRCR); + iowrite32(val | 0x2, cam->power_regs + REG_CCIC_CRCR); + } +} + /* * calc the dphy register values * There are three dphy registers being used. @@ -354,9 +377,11 @@ static int mmpcam_probe(struct platform_device *pdev) mcam = &cam->mcam; mcam->plat_power_up = mmpcam_power_up; mcam->plat_power_down = mmpcam_power_down; + mcam->ctlr_reset = mcam_ctlr_reset; mcam->calc_dphy = mmpcam_calc_dphy; mcam->dev = &pdev->dev; mcam->use_smbus = 0; + mcam->ccic_id = pdev->id; mcam->mclk_min = pdata->mclk_min; mcam->mclk_src = pdata->mclk_src; mcam->mclk_div = pdata->mclk_div; -- 2.30.2