From: Eero Nurkkala <ext-eero.nurkkala@xxxxxxxxx>
ASoC has an annoying bug letting either L or R channel to be
played on L channel. In other words, L and R channels can
switch at random. This provides McBSP funtionality that may
be used to fix this feature.
Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@xxxxxxxxx>
---
arch/arm/plat-omap/include/mach/mcbsp.h | 2 +
arch/arm/plat-omap/mcbsp.c | 52 +++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index cc48f2f..07dfcd0 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -385,6 +385,8 @@ int omap_mcbsp_request(unsigned int id);
void omap_mcbsp_free(unsigned int id);
void omap_mcbsp_start(unsigned int id);
void omap_mcbsp_stop(unsigned int id);
+void omap_mcbsp_xmit_enable(unsigned int id, u8 enable);
+void omap_mcbsp_recv_enable(unsigned int id, u8 enable);
void omap_mcbsp_xmit_word(unsigned int id, u32 word);
u32 omap_mcbsp_recv_word(unsigned int id);
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index f2401a8..5c4162d 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -378,6 +378,58 @@ void omap_mcbsp_stop(unsigned int id)
}
EXPORT_SYMBOL(omap_mcbsp_stop);
+void omap_mcbsp_xmit_enable(unsigned int id, u8 enable)
+{
+ struct omap_mcbsp *mcbsp;
+ void __iomem *io_base;
+ u16 w;
+
+ if (!(cpu_is_omap2430() || cpu_is_omap34xx()))
+ return;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return;
+ }
+
+ mcbsp = id_to_mcbsp_ptr(id);
+ io_base = mcbsp->io_base;
+
+ w = OMAP_MCBSP_READ(io_base, XCCR);
+
+ if (enable)
+ OMAP_MCBSP_WRITE(io_base, XCCR, w & ~(XDISABLE));
+ else
+ OMAP_MCBSP_WRITE(io_base, XCCR, w | XDISABLE);
+}
+EXPORT_SYMBOL(omap_mcbsp_xmit_enable);
+
+void omap_mcbsp_recv_enable(unsigned int id, u8 enable)
+{
+ struct omap_mcbsp *mcbsp;
+ void __iomem *io_base;
+ u16 w;
+
+ if (!(cpu_is_omap2430() || cpu_is_omap34xx()))
+ return;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return;
+ }
+
+ mcbsp = id_to_mcbsp_ptr(id);
+ io_base = mcbsp->io_base;
+
+ w = OMAP_MCBSP_READ(io_base, RCCR);
+
+ if (enable)
+ OMAP_MCBSP_WRITE(io_base, RCCR, w & ~(RDISABLE));
+ else
+ OMAP_MCBSP_WRITE(io_base, RCCR, w | RDISABLE);
+}
+EXPORT_SYMBOL(omap_mcbsp_recv_enable);
+
/* polled mcbsp i/o operations */
int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
{
--
1.5.2
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