From: "G, Manjunath Kondaiah" <manjugk@ti.com> To: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: khilman@ti.com, paul@pwsan.com, tony@atomide.com Subject: [PATCH v3 4/4] OMAP: DMA: Fix: context restore during off mode Date: Thu, 24 Mar 2011 07:00:19 +0530 [thread overview] Message-ID: <1300930219-23160-5-git-send-email-manjugk@ti.com> (raw) In-Reply-To: <1300930219-23160-1-git-send-email-manjugk@ti.com> The current DMA context restore clears all the DMA channel registers even if the channels are in use. This will result in transfer failures if repeated DMA transfers are initiated with one time DMA channel configuration. Also, remove access to sysconfig register during context save/restore since it will be handled through hwmod layer. Tested on OMAP3430 Zoom2 with - off mode enabled - one time DMA channel configuration - repeated DMA transfers Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com> --- arch/arm/plat-omap/dma.c | 9 --------- 1 files changed, 0 insertions(+), 9 deletions(-) diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index 3c39794..5c4ae7d 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -2059,29 +2059,20 @@ void omap_dma_global_context_save(void) pm_runtime_get_sync(dev); omap_dma_global_context.dma_irqenable_l0 = p->dma_read(IRQENABLE_L0, 0); - omap_dma_global_context.dma_ocp_sysconfig = - p->dma_read(OCP_SYSCONFIG, 0); omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0); pm_runtime_put_autosuspend(dev); } void omap_dma_global_context_restore(void) { - int ch; - pm_runtime_get_sync(dev); p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0); - p->dma_write(omap_dma_global_context.dma_ocp_sysconfig, - OCP_SYSCONFIG, 0); p->dma_write(omap_dma_global_context.dma_irqenable_l0, IRQENABLE_L0, 0); if (IS_DMA_ERRATA(DMA_ROMCODE_BUG)) p->dma_write(0x3 , IRQSTATUS_L0, 0); - for (ch = 0; ch < dma_chan_count; ch++) - if (dma_chan[ch].dev_id != -1) - omap_clear_dma(ch); pm_runtime_put_autosuspend(dev); } -- 1.7.1
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From: manjugk@ti.com (G, Manjunath Kondaiah) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 4/4] OMAP: DMA: Fix: context restore during off mode Date: Thu, 24 Mar 2011 07:00:19 +0530 [thread overview] Message-ID: <1300930219-23160-5-git-send-email-manjugk@ti.com> (raw) In-Reply-To: <1300930219-23160-1-git-send-email-manjugk@ti.com> The current DMA context restore clears all the DMA channel registers even if the channels are in use. This will result in transfer failures if repeated DMA transfers are initiated with one time DMA channel configuration. Also, remove access to sysconfig register during context save/restore since it will be handled through hwmod layer. Tested on OMAP3430 Zoom2 with - off mode enabled - one time DMA channel configuration - repeated DMA transfers Signed-off-by: G, Manjunath Kondaiah <manjugk@ti.com> --- arch/arm/plat-omap/dma.c | 9 --------- 1 files changed, 0 insertions(+), 9 deletions(-) diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index 3c39794..5c4ae7d 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -2059,29 +2059,20 @@ void omap_dma_global_context_save(void) pm_runtime_get_sync(dev); omap_dma_global_context.dma_irqenable_l0 = p->dma_read(IRQENABLE_L0, 0); - omap_dma_global_context.dma_ocp_sysconfig = - p->dma_read(OCP_SYSCONFIG, 0); omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0); pm_runtime_put_autosuspend(dev); } void omap_dma_global_context_restore(void) { - int ch; - pm_runtime_get_sync(dev); p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0); - p->dma_write(omap_dma_global_context.dma_ocp_sysconfig, - OCP_SYSCONFIG, 0); p->dma_write(omap_dma_global_context.dma_irqenable_l0, IRQENABLE_L0, 0); if (IS_DMA_ERRATA(DMA_ROMCODE_BUG)) p->dma_write(0x3 , IRQSTATUS_L0, 0); - for (ch = 0; ch < dma_chan_count; ch++) - if (dma_chan[ch].dev_id != -1) - omap_clear_dma(ch); pm_runtime_put_autosuspend(dev); } -- 1.7.1
next prev parent reply other threads:[~2011-03-24 1:34 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-03-24 1:30 [PATCH v3 0/4] OMAP: DMA: mstandby mode and runtime pm support G, Manjunath Kondaiah 2011-03-24 1:30 ` G, Manjunath Kondaiah 2011-03-24 1:30 ` [PATCH v3 1/4] OMAP2+: PM: omap device: API's for handling mstandby mode G, Manjunath Kondaiah 2011-03-24 1:30 ` G, Manjunath Kondaiah 2011-03-24 4:46 ` Paul Walmsley 2011-03-24 4:46 ` Paul Walmsley 2011-03-24 17:53 ` G, Manjunath Kondaiah 2011-03-24 17:53 ` G, Manjunath Kondaiah 2011-03-24 1:30 ` [PATCH v3 2/4] OMAP2+: DMA: prevent races while setting M idle mode to nostandby G, Manjunath Kondaiah 2011-03-24 1:30 ` G, Manjunath Kondaiah 2011-03-24 1:30 ` [PATCH v3 3/4] OMAP: PM: DMA: Enable runtime pm G, Manjunath Kondaiah 2011-03-24 1:30 ` G, Manjunath Kondaiah 2011-03-24 1:30 ` G, Manjunath Kondaiah [this message] 2011-03-24 1:30 ` [PATCH v3 4/4] OMAP: DMA: Fix: context restore during off mode G, Manjunath Kondaiah
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