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Subject[PATCH 2.5.71 RESEND] meye driver update
Hi,

The attached patch:

* replaces the pci_alloc_consistent calls with dma_alloc_coherent
because we want to do the allocations at GFP_KERNEL priority and
not GFP_ATOMIC because we request quite a bit of memory and the
allocation fails quite frequently.

It would be better to have a pci_alloc_consistent with an extra
parameter (priority) but since we haven't, and the meye driver is
supposed to work only on ix86 platforms we can safely do the
change.

* fixes the DMA engine stop request. The hard freezes encountered
when using this driver and repeatedly opening/closing the device
have been tracked down to this particular piece of code. The new
version seems to work way better, I haven't had a single freeze
since the change.

* fixes the irq handler prototype (irqreturn_t changes).

Linus, please apply.

Stelian.

===== drivers/media/video/meye.h 1.7 vs edited =====
--- 1.7/drivers/media/video/meye.h Tue Feb 18 12:30:51 2003
+++ edited/drivers/media/video/meye.h Wed Apr 16 10:01:38 2003
@@ -31,7 +31,7 @@
#define _MEYE_PRIV_H_

#define MEYE_DRIVER_MAJORVERSION 1
-#define MEYE_DRIVER_MINORVERSION 6
+#define MEYE_DRIVER_MINORVERSION 7

#include <linux/config.h>
#include <linux/types.h>
===== drivers/media/video/meye.c 1.16 vs edited =====
--- 1.16/drivers/media/video/meye.c Thu Apr 24 12:35:17 2003
+++ edited/drivers/media/video/meye.c Fri Apr 25 09:25:01 2003
@@ -167,9 +167,10 @@

memset(meye.mchip_ptable, 0, sizeof(meye.mchip_ptable));

- meye.mchip_ptable[MCHIP_NB_PAGES] = pci_alloc_consistent(meye.mchip_dev,
- PAGE_SIZE,
- &meye.mchip_dmahandle);
+ meye.mchip_ptable[MCHIP_NB_PAGES] = dma_alloc_coherent(&meye.mchip_dev->dev,
+ PAGE_SIZE,
+ &meye.mchip_dmahandle,
+ GFP_KERNEL);
if (!meye.mchip_ptable[MCHIP_NB_PAGES]) {
meye.mchip_dmahandle = 0;
return -1;
@@ -177,16 +178,17 @@

pt = (u32 *)meye.mchip_ptable[MCHIP_NB_PAGES];
for (i = 0; i < MCHIP_NB_PAGES; i++) {
- meye.mchip_ptable[i] = pci_alloc_consistent(meye.mchip_dev,
- PAGE_SIZE,
- pt);
+ meye.mchip_ptable[i] = dma_alloc_coherent(&meye.mchip_dev->dev,
+ PAGE_SIZE,
+ pt,
+ GFP_KERNEL);
if (!meye.mchip_ptable[i]) {
int j;
pt = (u32 *)meye.mchip_ptable[MCHIP_NB_PAGES];
for (j = 0; j < i; ++j) {
- pci_free_consistent(meye.mchip_dev,
- PAGE_SIZE,
- meye.mchip_ptable[j], *pt);
+ dma_free_coherent(&meye.mchip_dev->dev,
+ PAGE_SIZE,
+ meye.mchip_ptable[j], *pt);
pt++;
}
meye.mchip_dmahandle = 0;
@@ -204,17 +206,17 @@
pt = (u32 *)meye.mchip_ptable[MCHIP_NB_PAGES];
for (i = 0; i < MCHIP_NB_PAGES; i++) {
if (meye.mchip_ptable[i])
- pci_free_consistent(meye.mchip_dev,
- PAGE_SIZE,
- meye.mchip_ptable[i], *pt);
+ dma_free_coherent(&meye.mchip_dev->dev,
+ PAGE_SIZE,
+ meye.mchip_ptable[i], *pt);
pt++;
}

if (meye.mchip_ptable[MCHIP_NB_PAGES])
- pci_free_consistent(meye.mchip_dev,
- PAGE_SIZE,
- meye.mchip_ptable[MCHIP_NB_PAGES],
- meye.mchip_dmahandle);
+ dma_free_coherent(&meye.mchip_dev->dev,
+ PAGE_SIZE,
+ meye.mchip_ptable[MCHIP_NB_PAGES],
+ meye.mchip_dmahandle);

memset(meye.mchip_ptable, 0, sizeof(meye.mchip_ptable));
meye.mchip_dmahandle = 0;
@@ -613,25 +615,25 @@
/* stop any existing HIC action and wait for any dma to complete then
reset the dma engine */
static void mchip_hic_stop(void) {
- int i = 0;
+ int i, j;

meye.mchip_mode = MCHIP_HIC_MODE_NOOP;
- if (!(mchip_read(MCHIP_HIC_STATUS) & MCHIP_HIC_STATUS_BUSY))
+ if (!(mchip_read(MCHIP_HIC_STATUS) & MCHIP_HIC_STATUS_BUSY))
return;
- mchip_set(MCHIP_HIC_CMD, MCHIP_HIC_CMD_STOP);
- mchip_delay(MCHIP_HIC_CMD, 0);
- while (!mchip_delay(MCHIP_HIC_STATUS, MCHIP_HIC_STATUS_IDLE)) {
- /* resetting HIC */
+ for (i = 0; i < 20; ++i) {
mchip_set(MCHIP_HIC_CMD, MCHIP_HIC_CMD_STOP);
mchip_delay(MCHIP_HIC_CMD, 0);
+ for (j = 0; j < 100; ++j) {
+ if (mchip_delay(MCHIP_HIC_STATUS, MCHIP_HIC_STATUS_IDLE))
+ return;
+ wait_ms(1);
+ }
+ printk(KERN_ERR "meye: need to reset HIC!\n");
+
mchip_set(MCHIP_HIC_CTL, MCHIP_HIC_CTL_SOFT_RESET);
wait_ms(250);
- if (i++ > 20) {
- printk(KERN_ERR "meye: resetting HIC hanged!\n");
- break;
- }
}
- wait_ms(100);
+ printk(KERN_ERR "meye: resetting HIC hanged!\n");
}

/****************************************************************************/
@@ -832,7 +834,7 @@
/* Interrupt handling */
/****************************************************************************/

-static void meye_irq(int irq, void *dev_id, struct pt_regs *regs) {
+static irqreturn_t meye_irq(int irq, void *dev_id, struct pt_regs *regs) {
u32 v;
int reqnr;
v = mchip_read(MCHIP_MM_INTA);
@@ -840,7 +842,7 @@
while (1) {
v = mchip_get_frame();
if (!(v & MCHIP_MM_FIR_RDY))
- return;
+ return IRQ_NONE;
switch (meye.mchip_mode) {

case MCHIP_HIC_MODE_CONT_OUT:
@@ -873,11 +875,12 @@

default:
/* do not free frame, since it can be a snap */
- return;
+ return IRQ_NONE;
} /* switch */

mchip_free_frame();
}
+ return IRQ_HANDLED;
}

/****************************************************************************/
@@ -1391,6 +1394,8 @@

mchip_hic_stop();

+ mchip_dma_free();
+
/* disable interrupts */
mchip_set(MCHIP_MM_INTA, 0x0);

@@ -1402,8 +1407,6 @@
pci_resource_len(meye.mchip_dev, 0));

pci_disable_device(meye.mchip_dev);
-
- mchip_dma_free();

if (meye.grab_fbuffer)
rvfree(meye.grab_fbuffer, gbuffers*gbufsize);
--
Stelian Pop <stelian@popies.net>
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