i2c-isch: Decrease delay in command completion check loop
Generally it is not needed to wait for 1 msec, the SMBus get often ready in less than 200 usecs. msleep(1) can wait up to 20 msecs... It has a significant impact when there is a burst of transactions on the bus. Signed-off-by: Olivier Sobrie <olivier@sobrie.be> Signed-off-by: Jean Delvare <khali@linux-fr.org>
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@ -47,7 +47,7 @@
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#define SMBBLKDAT (0x20 + sch_smba)
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/* Other settings */
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#define MAX_TIMEOUT 500
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#define MAX_RETRIES 5000
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/* I2C constants */
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#define SCH_QUICK 0x00
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@ -68,7 +68,7 @@ static int sch_transaction(void)
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{
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int temp;
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int result = 0;
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int timeout = 0;
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int retries = 0;
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dev_dbg(&sch_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
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"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT),
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@ -100,12 +100,12 @@ static int sch_transaction(void)
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outb(inb(SMBHSTCNT) | 0x10, SMBHSTCNT);
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do {
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msleep(1);
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usleep_range(100, 200);
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temp = inb(SMBHSTSTS) & 0x0f;
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} while ((temp & 0x08) && (timeout++ < MAX_TIMEOUT));
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} while ((temp & 0x08) && (retries++ < MAX_RETRIES));
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/* If the SMBus is still busy, we give up */
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if (timeout > MAX_TIMEOUT) {
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if (retries > MAX_RETRIES) {
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dev_err(&sch_adapter.dev, "SMBus Timeout!\n");
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result = -ETIMEDOUT;
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}
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