[PATCH] ASoC: rsnd: add interrupt support for SSI BUSIF buffer

Yongbo Zhang
2020-05-08T07:48:52Z

SSI BUSIF buffer is possible to overflow or underflow, especially in a
hypervisor environment. If there is no interrupt support, it will eventually
lead to errors in pcm data.
This patch adds overflow and underflow interrupt support for SSI BUSIF buffer.

Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reported-by: Chen Li <licheng0822@thundersoft.com>
Signed-off-by: Yongbo Zhang <giraffesnn123@gmail.com>
Tested-by: Chen Li <licheng0822@thundersoft.com>
---
sound/soc/sh/rcar/gen.c | 8 +++
sound/soc/sh/rcar/rsnd.h | 9 +++
sound/soc/sh/rcar/ssi.c | 142 +++++++++++++++++++++++++++++++++++++++
3 files changed, 159 insertions(+)

diff --git a/sound/soc/sh/rcar/gen.c b/sound/soc/sh/rcar/gen.c
index af19010b9d88..8bd49c8a9517 100644
--- a/sound/soc/sh/rcar/gen.c
+++ b/sound/soc/sh/rcar/gen.c
@@ -224,6 +224,14 @@ static int rsnd_gen2_probe(struct rsnd_priv *priv)
RSND_GEN_S_REG(SSI_SYS_STATUS5, 0x884),
RSND_GEN_S_REG(SSI_SYS_STATUS6, 0x888),
RSND_GEN_S_REG(SSI_SYS_STATUS7, 0x88c),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE0, 0x850),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE1, 0x854),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE2, 0x858),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE3, 0x85c),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE4, 0x890),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE5, 0x894),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE6, 0x898),
+ RSND_GEN_S_REG(SSI_SYS_INT_ENABLE7, 0x89c),
RSND_GEN_S_REG(HDMI0_SEL, 0x9e0),
RSND_GEN_S_REG(HDMI1_SEL, 0x9e4),

diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index ea6cbaa9743e..d47608ff5fac 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -189,6 +189,14 @@ enum rsnd_reg {
SSI_SYS_STATUS5,
SSI_SYS_STATUS6,
SSI_SYS_STATUS7,
+ SSI_SYS_INT_ENABLE0,
+ SSI_SYS_INT_ENABLE1,
+ SSI_SYS_INT_ENABLE2,
+ SSI_SYS_INT_ENABLE3,
+ SSI_SYS_INT_ENABLE4,
+ SSI_SYS_INT_ENABLE5,
+ SSI_SYS_INT_ENABLE6,
+ SSI_SYS_INT_ENABLE7,
HDMI0_SEL,
HDMI1_SEL,
SSI9_BUSIF0_MODE,
@@ -237,6 +245,7 @@ enum rsnd_reg {
#define SSI9_BUSIF_ADINR(i) (SSI9_BUSIF0_ADINR + (i))
#define SSI9_BUSIF_DALIGN(i) (SSI9_BUSIF0_DALIGN + (i))
#define SSI_SYS_STATUS(i) (SSI_SYS_STATUS0 + (i))
+#define SSI_SYS_INT_ENABLE(i) (SSI_SYS_INT_ENABLE0 + (i))

struct rsnd_priv;
diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 4a7d3413917f..178f50a91b3e 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -372,6 +372,9 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
u32 wsr = ssi->wsr;
int width;
int is_tdm, is_tdm_split;
+ int id = rsnd_mod_id(mod);
+ int i;
+ u32 sys_int_enable = 0;

is_tdm = rsnd_runtime_is_tdm(io);
is_tdm_split = rsnd_runtime_is_tdm_split(io);
@@ -447,6 +450,38 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
cr_mode = DIEN; /* PIO : enable Data interrupt */
}

+ /* enable busif buffer over/under run interrupt. */
+ if (is_tdm || is_tdm_split) {
+ switch (id) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ for (i = 0; i < 4; i++) {
+ sys_int_enable = rsnd_mod_read(mod,
+ SSI_SYS_INT_ENABLE(i * 2));
+ sys_int_enable |= 0xf << (id * 4);
+ rsnd_mod_write(mod,
+ SSI_SYS_INT_ENABLE(i * 2),
+ sys_int_enable);
+ }
+
+ break;
+ case 9:
+ for (i = 0; i < 4; i++) {
+ sys_int_enable = rsnd_mod_read(mod,
+ SSI_SYS_INT_ENABLE((i * 2) + 1));
+ sys_int_enable |= 0xf << 4;
+ rsnd_mod_write(mod,
+ SSI_SYS_INT_ENABLE((i * 2) + 1),
+ sys_int_enable);
+ }
+
+ break;
+ }
+ }
+
init_end:
ssi->cr_own = cr_own;
ssi->cr_mode = cr_mode;
@@ -496,6 +531,13 @@ static int rsnd_ssi_quit(struct rsnd_mod *mod,
{
struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
struct device *dev = rsnd_priv_to_dev(priv);
+ int is_tdm, is_tdm_split;
+ int id = rsnd_mod_id(mod);
+ int i;
+ u32 sys_int_enable = 0;
+
+ is_tdm = rsnd_runtime_is_tdm(io);
+ is_tdm_split = rsnd_runtime_is_tdm_split(io);

if (!rsnd_ssi_is_run_mods(mod, io))
return 0;
@@ -517,6 +559,37 @@ static int rsnd_ssi_quit(struct rsnd_mod *mod,
ssi->wsr = 0;
}

+ /* disable busif buffer over/under run interrupt. */
+ if (is_tdm || is_tdm_split) {
+ switch (id) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ for (i = 0; i < 4; i++) {
+ sys_int_enable = rsnd_mod_read(mod,
+ SSI_SYS_INT_ENABLE(i * 2));
+ sys_int_enable &= ~(0xf << (id * 4));
+ rsnd_mod_write(mod,
+ SSI_SYS_INT_ENABLE(i * 2),
+ sys_int_enable);
+ }
+
+ break;
+ case 9:
+ for (i = 0; i < 4; i++) {
+ sys_int_enable = rsnd_mod_read(mod,
+ SSI_SYS_INT_ENABLE((i * 2) + 1));
+ sys_int_enable &= ~(0xf << 4);
+ rsnd_mod_write(mod,
+ SSI_SYS_INT_ENABLE((i * 2) + 1),
+ sys_int_enable);
+ }
+
+ break;
+ }
+
return 0;
}

@@ -622,6 +695,11 @@ static int rsnd_ssi_irq(struct rsnd_mod *mod,
int enable)
{
u32 val = 0;
+ int is_tdm, is_tdm_split;
+ int id = rsnd_mod_id(mod);
+
+ is_tdm = rsnd_runtime_is_tdm(io);
+ is_tdm_split = rsnd_runtime_is_tdm_split(io);

if (rsnd_is_gen1(priv))
return 0;
@@ -635,6 +713,19 @@ static int rsnd_ssi_irq(struct rsnd_mod *mod,
if (enable)
val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;

+ if (is_tdm || is_tdm_split) {
+ switch (id) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 9:
+ val |= 0xff00;
+ break;
+ }
+ }
+
rsnd_mod_write(mod, SSI_INT_ENABLE, val);

return 0;
@@ -651,6 +742,10 @@ static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
u32 status;
bool elapsed = false;
bool stop = false;
+ int is_tdm, is_tdm_split;
+
+ is_tdm = rsnd_runtime_is_tdm(io);
+ is_tdm_split = rsnd_runtime_is_tdm_split(io);

spin_lock(&priv->lock);

@@ -672,6 +767,53 @@ static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
stop = true;
}

+ status = 0;
+
+ if (is_tdm || is_tdm_split) {
+ switch (id) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ for (i = 0; i < 4; i++) {
+ status = rsnd_mod_read(mod,
+ SSI_SYS_STATUS(i * 2));
+ status &= 0xf << (id * 4);
+
+ if (status) {
+ rsnd_dbg_irq_status(dev,
+ "%s err status : 0x%08x\n",
+ rsnd_mod_name(mod), status);
+ rsnd_mod_write(mod,
+ SSI_SYS_STATUS(i * 2),
+ 0xf << (id * 4));
+ stop = true;
+ break;
+ }
+ }
+ break;
+ case 9:
+ for (i = 0; i < 4; i++) {
+ status = rsnd_mod_write(mod,
+ SSI_SYS_STATUS((i * 2) + 1));
+ status &= 0xf << 4;
+
+ if (status) {
+ rsnd_dbg_irq_status(dev,
+ "%s err status : 0x%08x\n",
+ rsnd_mod_name(mod), status);
+ rsnd_mod_write(mod,
+ SSI_SYS_STATUS((i * 2) + 1),
+ 0xf << 4);
+ stop = true;
+ break;
+ }
+ }
+ break;
+ }
+ }
+
rsnd_ssi_status_clear(mod);
rsnd_ssi_interrupt_out:
spin_unlock(&priv->lock);
--
2.26.2