[PATCH v6 08/16] dmaengine: tegra-apb: Fix coding style problems

From: Dmitry Osipenko
Date: Wed Jan 29 2020 - 23:41:51 EST

This patch fixes few dozens of coding style problems reported by
checkpatch and prettifies code where makes sense.

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/dma/tegra20-apb-dma.c | 275 ++++++++++++++++++----------------
1 file changed, 144 insertions(+), 131 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index dff21e80ffa4..b4535b3a07ce 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -59,7 +59,7 @@
#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC

#define TEGRA_APBDMA_CHAN_CSRE 0x00C
-#define TEGRA_APBDMA_CHAN_CSRE_PAUSE (1 << 31)
+#define TEGRA_APBDMA_CHAN_CSRE_PAUSE BIT(31)

/* AHB memory address */
#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
@@ -120,21 +120,21 @@ struct tegra_dma;
* @support_separate_wcount_reg: Support separate word count register.
*/
struct tegra_dma_chip_data {
- int nr_channels;
- int channel_reg_size;
- int max_dma_count;
+ unsigned int nr_channels;
+ unsigned int channel_reg_size;
+ unsigned int max_dma_count;
bool support_channel_pause;
bool support_separate_wcount_reg;
};

/* DMA channel registers */
struct tegra_dma_channel_regs {
- unsigned long csr;
- unsigned long ahb_ptr;
- unsigned long apb_ptr;
- unsigned long ahb_seq;
- unsigned long apb_seq;
- unsigned long wcount;
+ u32 csr;
+ u32 ahb_ptr;
+ u32 apb_ptr;
+ u32 ahb_seq;
+ u32 apb_seq;
+ u32 wcount;
};

/*
@@ -168,7 +168,7 @@ struct tegra_dma_desc {
struct list_head node;
struct list_head tx_list;
struct list_head cb_node;
- int cb_count;
+ unsigned int cb_count;
};

struct tegra_dma_channel;
@@ -181,7 +181,7 @@ struct tegra_dma_channel {
struct dma_chan dma_chan;
char name[12];
bool config_init;
- int id;
+ unsigned int id;
void __iomem *chan_addr;
spinlock_t lock;
bool busy;
@@ -201,7 +201,7 @@ struct tegra_dma_channel {
/* Channel-slave specific configuration */
unsigned int slave_id;
struct dma_slave_config dma_sconfig;
- struct tegra_dma_channel_regs channel_reg;
+ struct tegra_dma_channel_regs channel_reg;
};

/* tegra_dma: Tegra DMA specific information */
@@ -239,7 +239,7 @@ static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg)
}

static inline void tdc_write(struct tegra_dma_channel *tdc,
- u32 reg, u32 val)
+ u32 reg, u32 val)
{
writel(val, tdc->chan_addr + reg);
}
@@ -254,8 +254,8 @@ static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
return container_of(dc, struct tegra_dma_channel, dma_chan);
}

-static inline struct tegra_dma_desc *txd_to_tegra_dma_desc(
- struct dma_async_tx_descriptor *td)
+static inline struct tegra_dma_desc *
+txd_to_tegra_dma_desc(struct dma_async_tx_descriptor *td)
{
return container_of(td, struct tegra_dma_desc, txd);
}
@@ -270,8 +270,7 @@ static int tegra_dma_runtime_suspend(struct device *dev);
static int tegra_dma_runtime_resume(struct device *dev);

/* Get DMA desc from free list, if not there then allocate it. */
-static struct tegra_dma_desc *tegra_dma_desc_get(
- struct tegra_dma_channel *tdc)
+static struct tegra_dma_desc *tegra_dma_desc_get(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc;
unsigned long flags;
@@ -298,11 +297,12 @@ static struct tegra_dma_desc *tegra_dma_desc_get(
dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
dma_desc->txd.tx_submit = tegra_dma_tx_submit;
dma_desc->txd.flags = 0;
+
return dma_desc;
}

static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
- struct tegra_dma_desc *dma_desc)
+ struct tegra_dma_desc *dma_desc)
{
unsigned long flags;

@@ -313,29 +313,29 @@ static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
spin_unlock_irqrestore(&tdc->lock, flags);
}

-static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
- struct tegra_dma_channel *tdc)
+static struct tegra_dma_sg_req *
+tegra_dma_sg_req_get(struct tegra_dma_channel *tdc)
{
- struct tegra_dma_sg_req *sg_req = NULL;
+ struct tegra_dma_sg_req *sg_req;
unsigned long flags;

spin_lock_irqsave(&tdc->lock, flags);
if (!list_empty(&tdc->free_sg_req)) {
- sg_req = list_first_entry(&tdc->free_sg_req,
- typeof(*sg_req), node);
+ sg_req = list_first_entry(&tdc->free_sg_req, typeof(*sg_req),
+ node);
list_del(&sg_req->node);
spin_unlock_irqrestore(&tdc->lock, flags);
return sg_req;
}
spin_unlock_irqrestore(&tdc->lock, flags);

- sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_NOWAIT);
+ sg_req = kzalloc(sizeof(*sg_req), GFP_NOWAIT);

return sg_req;
}

static int tegra_dma_slave_config(struct dma_chan *dc,
- struct dma_slave_config *sconfig)
+ struct dma_slave_config *sconfig)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);

@@ -352,11 +352,12 @@ static int tegra_dma_slave_config(struct dma_chan *dc,
tdc->slave_id = sconfig->slave_id;
}
tdc->config_init = true;
+
return 0;
}

static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
- bool wait_for_burst_complete)
+ bool wait_for_burst_complete)
{
struct tegra_dma *tdma = tdc->tdma;

@@ -391,13 +392,13 @@ static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
}

static void tegra_dma_pause(struct tegra_dma_channel *tdc,
- bool wait_for_burst_complete)
+ bool wait_for_burst_complete)
{
struct tegra_dma *tdma = tdc->tdma;

if (tdma->chip_data->support_channel_pause) {
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE,
- TEGRA_APBDMA_CHAN_CSRE_PAUSE);
+ TEGRA_APBDMA_CHAN_CSRE_PAUSE);
if (wait_for_burst_complete)
udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
} else {
@@ -409,17 +410,15 @@ static void tegra_dma_resume(struct tegra_dma_channel *tdc)
{
struct tegra_dma *tdma = tdc->tdma;

- if (tdma->chip_data->support_channel_pause) {
+ if (tdma->chip_data->support_channel_pause)
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0);
- } else {
+ else
tegra_dma_global_resume(tdc);
- }
}

static void tegra_dma_stop(struct tegra_dma_channel *tdc)
{
- u32 csr;
- u32 status;
+ u32 csr, status;

/* Disable interrupts */
csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
@@ -440,7 +439,7 @@ static void tegra_dma_stop(struct tegra_dma_channel *tdc)
}

static void tegra_dma_start(struct tegra_dma_channel *tdc,
- struct tegra_dma_sg_req *sg_req)
+ struct tegra_dma_sg_req *sg_req)
{
struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;

@@ -454,11 +453,11 @@ static void tegra_dma_start(struct tegra_dma_channel *tdc,

/* Start DMA */
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
- ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
+ ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
}

static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
- struct tegra_dma_sg_req *nsg_req)
+ struct tegra_dma_sg_req *nsg_req)
{
unsigned long status;

@@ -492,9 +491,9 @@ static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
if (tdc->tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
- nsg_req->ch_regs.wcount);
+ nsg_req->ch_regs.wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
- nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
+ nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
nsg_req->configured = true;
nsg_req->words_xferred = 0;

@@ -508,8 +507,7 @@ static void tdc_start_head_req(struct tegra_dma_channel *tdc)
if (list_empty(&tdc->pending_sg_req))
return;

- sg_req = list_first_entry(&tdc->pending_sg_req,
- typeof(*sg_req), node);
+ sg_req = list_first_entry(&tdc->pending_sg_req, typeof(*sg_req), node);
tegra_dma_start(tdc, sg_req);
sg_req->configured = true;
sg_req->words_xferred = 0;
@@ -518,34 +516,35 @@ static void tdc_start_head_req(struct tegra_dma_channel *tdc)

static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
{
- struct tegra_dma_sg_req *hsgreq;
- struct tegra_dma_sg_req *hnsgreq;
+ struct tegra_dma_sg_req *hsgreq, *hnsgreq;

if (list_empty(&tdc->pending_sg_req))
return;

hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
- hnsgreq = list_first_entry(&hsgreq->node,
- typeof(*hnsgreq), node);
+ hnsgreq = list_first_entry(&hsgreq->node, typeof(*hnsgreq),
+ node);
tegra_dma_configure_for_next(tdc, hnsgreq);
}
}

-static inline int get_current_xferred_count(struct tegra_dma_channel *tdc,
- struct tegra_dma_sg_req *sg_req, unsigned long status)
+static inline unsigned int
+get_current_xferred_count(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req,
+ unsigned long status)
{
return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
}

static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
{
- struct tegra_dma_sg_req *sgreq;
struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sgreq;

while (!list_empty(&tdc->pending_sg_req)) {
- sgreq = list_first_entry(&tdc->pending_sg_req,
- typeof(*sgreq), node);
+ sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq),
+ node);
list_move_tail(&sgreq->node, &tdc->free_sg_req);
if (sgreq->last_sg) {
dma_desc = sgreq->dma_desc;
@@ -555,7 +554,7 @@ static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
/* Add in cb list if it is not there. */
if (!dma_desc->cb_count)
list_add_tail(&dma_desc->cb_node,
- &tdc->cb_desc);
+ &tdc->cb_desc);
dma_desc->cb_count++;
}
}
@@ -563,9 +562,10 @@ static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
}

static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
- struct tegra_dma_sg_req *last_sg_req, bool to_terminate)
+ struct tegra_dma_sg_req *last_sg_req,
+ bool to_terminate)
{
- struct tegra_dma_sg_req *hsgreq = NULL;
+ struct tegra_dma_sg_req *hsgreq;

if (list_empty(&tdc->pending_sg_req)) {
dev_err(tdc2dev(tdc), "DMA is running without req\n");
@@ -589,14 +589,15 @@ static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
/* Configure next request */
if (!to_terminate)
tdc_configure_next_head_desc(tdc);
+
return true;
}

static void handle_once_dma_done(struct tegra_dma_channel *tdc,
- bool to_terminate)
+ bool to_terminate)
{
- struct tegra_dma_sg_req *sgreq;
struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sgreq;

tdc->busy = false;
sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
@@ -622,10 +623,10 @@ static void handle_once_dma_done(struct tegra_dma_channel *tdc,
}

static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
- bool to_terminate)
+ bool to_terminate)
{
- struct tegra_dma_sg_req *sgreq;
struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sgreq;
bool st;

sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
@@ -657,13 +658,13 @@ static void tegra_dma_tasklet(unsigned long data)
struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data;
struct dmaengine_desc_callback cb;
struct tegra_dma_desc *dma_desc;
+ unsigned int cb_count;
unsigned long flags;
- int cb_count;

spin_lock_irqsave(&tdc->lock, flags);
while (!list_empty(&tdc->cb_desc)) {
- dma_desc = list_first_entry(&tdc->cb_desc,
- typeof(*dma_desc), cb_node);
+ dma_desc = list_first_entry(&tdc->cb_desc, typeof(*dma_desc),
+ cb_node);
list_del(&dma_desc->cb_node);
dmaengine_desc_get_callback(&dma_desc->txd, &cb);
cb_count = dma_desc->cb_count;
@@ -681,8 +682,8 @@ static void tegra_dma_tasklet(unsigned long data)
static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
{
struct tegra_dma_channel *tdc = dev_id;
- unsigned long status;
unsigned long flags;
+ u32 status;

spin_lock_irqsave(&tdc->lock, flags);

@@ -697,8 +698,9 @@ static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
}

spin_unlock_irqrestore(&tdc->lock, flags);
- dev_info(tdc2dev(tdc),
- "Interrupt already served status 0x%08lx\n", status);
+ dev_info(tdc2dev(tdc), "Interrupt already served status 0x%08x\n",
+ status);
+
return IRQ_NONE;
}

@@ -714,6 +716,7 @@ static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
cookie = dma_cookie_assign(&dma_desc->txd);
list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
spin_unlock_irqrestore(&tdc->lock, flags);
+
return cookie;
}

@@ -747,11 +750,10 @@ static void tegra_dma_issue_pending(struct dma_chan *dc)
static int tegra_dma_terminate_all(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
- struct tegra_dma_sg_req *sgreq;
struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sgreq;
unsigned long flags;
- unsigned long status;
- unsigned long wcount;
+ u32 status, wcount;
bool was_busy;

spin_lock_irqsave(&tdc->lock, flags);
@@ -777,8 +779,8 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
tegra_dma_stop(tdc);

if (!list_empty(&tdc->pending_sg_req) && was_busy) {
- sgreq = list_first_entry(&tdc->pending_sg_req,
- typeof(*sgreq), node);
+ sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq),
+ node);
sgreq->dma_desc->bytes_transferred +=
get_current_xferred_count(tdc, sgreq, wcount);
}
@@ -788,12 +790,13 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
tegra_dma_abort_all(tdc);

while (!list_empty(&tdc->cb_desc)) {
- dma_desc = list_first_entry(&tdc->cb_desc,
- typeof(*dma_desc), cb_node);
+ dma_desc = list_first_entry(&tdc->cb_desc, typeof(*dma_desc),
+ cb_node);
list_del(&dma_desc->cb_node);
dma_desc->cb_count = 0;
}
spin_unlock_irqrestore(&tdc->lock, flags);
+
return 0;
}

@@ -807,7 +810,7 @@ static void tegra_dma_synchronize(struct dma_chan *dc)
static unsigned int tegra_dma_sg_bytes_xferred(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req)
{
- unsigned long status, wcount = 0;
+ u32 status, wcount = 0;

if (!list_is_first(&sg_req->node, &tdc->pending_sg_req))
return 0;
@@ -864,7 +867,8 @@ static unsigned int tegra_dma_sg_bytes_xferred(struct tegra_dma_channel *tdc,
}

static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
- dma_cookie_t cookie, struct dma_tx_state *txstate)
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
@@ -911,11 +915,12 @@ static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,

trace_tegra_dma_tx_status(&tdc->dma_chan, cookie, txstate);
spin_unlock_irqrestore(&tdc->lock, flags);
+
return ret;
}

-static inline int get_bus_width(struct tegra_dma_channel *tdc,
- enum dma_slave_buswidth slave_bw)
+static inline unsigned int get_bus_width(struct tegra_dma_channel *tdc,
+ enum dma_slave_buswidth slave_bw)
{
switch (slave_bw) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
@@ -928,16 +933,17 @@ static inline int get_bus_width(struct tegra_dma_channel *tdc,
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
default:
dev_warn(tdc2dev(tdc),
- "slave bw is not supported, using 32bits\n");
+ "slave bw is not supported, using 32bits\n");
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
}
}

-static inline int get_burst_size(struct tegra_dma_channel *tdc,
- u32 burst_size, enum dma_slave_buswidth slave_bw, int len)
+static inline unsigned int get_burst_size(struct tegra_dma_channel *tdc,
+ u32 burst_size,
+ enum dma_slave_buswidth slave_bw,
+ u32 len)
{
- int burst_byte;
- int burst_ahb_width;
+ unsigned int burst_byte, burst_ahb_width;

/*
* burst_size from client is in terms of the bus_width.
@@ -964,9 +970,12 @@ static inline int get_burst_size(struct tegra_dma_channel *tdc,
}

static int get_transfer_param(struct tegra_dma_channel *tdc,
- enum dma_transfer_direction direction, unsigned long *apb_addr,
- unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size,
- enum dma_slave_buswidth *slave_bw)
+ enum dma_transfer_direction direction,
+ u32 *apb_addr,
+ u32 *apb_seq,
+ u32 *csr,
+ unsigned int *burst_size,
+ enum dma_slave_buswidth *slave_bw)
{
switch (direction) {
case DMA_MEM_TO_DEV:
@@ -987,13 +996,15 @@ static int get_transfer_param(struct tegra_dma_channel *tdc,

default:
dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
- return -EINVAL;
+ break;
}
+
return -EINVAL;
}

static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
- struct tegra_dma_channel_regs *ch_regs, u32 len)
+ struct tegra_dma_channel_regs *ch_regs,
+ u32 len)
{
u32 len_field = (len - 4) & 0xFFFC;

@@ -1003,20 +1014,23 @@ static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
ch_regs->csr |= len_field;
}

-static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
- struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
- enum dma_transfer_direction direction, unsigned long flags,
- void *context)
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_slave_sg(struct dma_chan *dc,
+ struct scatterlist *sgl,
+ unsigned int sg_len,
+ enum dma_transfer_direction direction,
+ unsigned long flags,
+ void *context)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_sg_req *sg_req = NULL;
+ u32 csr, ahb_seq, apb_ptr, apb_seq;
+ enum dma_slave_buswidth slave_bw;
struct tegra_dma_desc *dma_desc;
- unsigned int i;
- struct scatterlist *sg;
- unsigned long csr, ahb_seq, apb_ptr, apb_seq;
struct list_head req_list;
- struct tegra_dma_sg_req *sg_req = NULL;
- u32 burst_size;
- enum dma_slave_buswidth slave_bw;
+ struct scatterlist *sg;
+ unsigned int burst_size;
+ unsigned int i;

if (!tdc->config_init) {
dev_err(tdc2dev(tdc), "DMA channel is not configured\n");
@@ -1028,7 +1042,7 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
}

if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
- &burst_size, &slave_bw) < 0)
+ &burst_size, &slave_bw) < 0)
return NULL;

INIT_LIST_HEAD(&req_list);
@@ -1074,7 +1088,7 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
len = sg_dma_len(sg);

if ((len & 3) || (mem & 3) ||
- (len > tdc->tdma->chip_data->max_dma_count)) {
+ len > tdc->tdma->chip_data->max_dma_count) {
dev_err(tdc2dev(tdc),
"DMA length/memory address is not supported\n");
tegra_dma_desc_put(tdc, dma_desc);
@@ -1126,20 +1140,21 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
return &dma_desc->txd;
}

-static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
- struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags)
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_dma_cyclic(struct dma_chan *dc, dma_addr_t buf_addr,
+ size_t buf_len,
+ size_t period_len,
+ enum dma_transfer_direction direction,
+ unsigned long flags)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
- struct tegra_dma_desc *dma_desc = NULL;
struct tegra_dma_sg_req *sg_req = NULL;
- unsigned long csr, ahb_seq, apb_ptr, apb_seq;
- int len;
- size_t remain_len;
- dma_addr_t mem = buf_addr;
- u32 burst_size;
+ u32 csr, ahb_seq, apb_ptr, apb_seq;
enum dma_slave_buswidth slave_bw;
+ struct tegra_dma_desc *dma_desc;
+ dma_addr_t mem = buf_addr;
+ unsigned int burst_size;
+ size_t len, remain_len;

if (!buf_len || !period_len) {
dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
@@ -1173,13 +1188,13 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(

len = period_len;
if ((len & 3) || (buf_addr & 3) ||
- (len > tdc->tdma->chip_data->max_dma_count)) {
+ len > tdc->tdma->chip_data->max_dma_count) {
dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
return NULL;
}

if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
- &burst_size, &slave_bw) < 0)
+ &burst_size, &slave_bw) < 0)
return NULL;

ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
@@ -1303,8 +1318,8 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
tdc->isr_handler = NULL;

while (!list_empty(&dma_desc_list)) {
- dma_desc = list_first_entry(&dma_desc_list,
- typeof(*dma_desc), node);
+ dma_desc = list_first_entry(&dma_desc_list, typeof(*dma_desc),
+ node);
list_del(&dma_desc->node);
kfree(dma_desc);
}
@@ -1323,8 +1338,8 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct tegra_dma *tdma = ofdma->of_dma_data;
- struct dma_chan *chan;
struct tegra_dma_channel *tdc;
+ struct dma_chan *chan;

if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) {
dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]);
@@ -1379,20 +1394,16 @@ static const struct tegra_dma_chip_data tegra148_dma_chip_data = {

static int tegra_dma_probe(struct platform_device *pdev)
{
+ const struct tegra_dma_chip_data *cdata;
struct tegra_dma *tdma;
+ unsigned int i;
+ size_t size;
int ret;
- int i;
- const struct tegra_dma_chip_data *cdata;

cdata = of_device_get_match_data(&pdev->dev);
- if (!cdata) {
- dev_err(&pdev->dev, "Error: No device match data found\n");
- return -ENODEV;
- }
+ size = struct_size(tdma, channels, cdata->nr_channels);

- tdma = devm_kzalloc(&pdev->dev,
- struct_size(tdma, channels, cdata->nr_channels),
- GFP_KERNEL);
+ tdma = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!tdma)
return -ENOMEM;

@@ -1424,10 +1435,8 @@ static int tegra_dma_probe(struct platform_device *pdev)
else
ret = pm_runtime_get_sync(&pdev->dev);

- if (ret < 0) {
- pm_runtime_disable(&pdev->dev);
- return ret;
- }
+ if (ret < 0)
+ goto err_pm_disable;

/* Reset DMA controller */
reset_control_assert(tdma->rst);
@@ -1470,13 +1479,13 @@ static int tegra_dma_probe(struct platform_device *pdev)
tdc->dma_chan.device = &tdma->dma_dev;
dma_cookie_init(&tdc->dma_chan);
list_add_tail(&tdc->dma_chan.device_node,
- &tdma->dma_dev.channels);
+ &tdma->dma_dev.channels);
tdc->tdma = tdma;
tdc->id = i;
tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;

tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
- (unsigned long)tdc);
+ (unsigned long)tdc);
spin_lock_init(&tdc->lock);

INIT_LIST_HEAD(&tdc->pending_sg_req);
@@ -1528,16 +1537,19 @@ static int tegra_dma_probe(struct platform_device *pdev)
goto err_unregister_dma_dev;
}

- dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
- cdata->nr_channels);
+ dev_info(&pdev->dev, "Tegra20 APB DMA driver registered %u channels\n",
+ cdata->nr_channels);
+
return 0;

err_unregister_dma_dev:
dma_async_device_unregister(&tdma->dma_dev);
+
err_pm_disable:
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
tegra_dma_runtime_suspend(&pdev->dev);
+
return ret;
}

@@ -1557,7 +1569,7 @@ static int tegra_dma_remove(struct platform_device *pdev)
static int tegra_dma_runtime_suspend(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
- int i;
+ unsigned int i;

tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL);
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
@@ -1586,7 +1598,8 @@ static int tegra_dma_runtime_suspend(struct device *dev)
static int tegra_dma_runtime_resume(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
- int i, ret;
+ unsigned int i;
+ int ret;

ret = clk_prepare_enable(tdma->dma_clk);
if (ret < 0) {
@@ -1614,7 +1627,7 @@ static int tegra_dma_runtime_resume(struct device *dev)
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_reg->ahb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
- (ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB));
+ ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB);
}

return 0;
--
2.24.0