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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-05-15 06:40:21 +0300
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-06-12 07:05:23 +0300
commitc49e34401a32acc05bafec2b3d28d8e58410724c (patch)
treec465d8e3f5384a97bff39d9e6e14513056dba68f /drivers/fsi
parent4e56828a5db19e2de8f8dc464c6df2e7e9ff4e13 (diff)
downloadlinux-c49e34401a32acc05bafec2b3d28d8e58410724c.tar.xz
fsi/fsi-master-gpio: More error handling cleanup
Remove calls to the empty and useless fsi_master_gpio_error() function, and report CRC errors as "FSI_ERR_NO_SLAVE" when reading an all 1's response. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi')
-rw-r--r--drivers/fsi/fsi-master-gpio.c26
1 files changed, 5 insertions, 21 deletions
diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index 351c12f2ac55..da556da62846 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -41,13 +41,6 @@
#define FSI_GPIO_RESP_BUSY 1 /* Slave busy */
#define FSI_GPIO_RESP_ERRA 2 /* Any (misc) Error */
#define FSI_GPIO_RESP_ERRC 3 /* Slave reports master CRC error */
-#define FSI_GPIO_MTOE 4 /* Master time out error */
-#define FSI_GPIO_CRC_INVAL 5 /* Master reports slave CRC error */
-
-/* Normal slave responses */
-#define FSI_GPIO_RESP_BUSY 1
-#define FSI_GPIO_RESP_ACK 0
-#define FSI_GPIO_RESP_ACKD 4
#define FSI_GPIO_MAX_BUSY 200
#define FSI_GPIO_MTOE_COUNT 1000
@@ -360,15 +353,6 @@ static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
}
/*
- * Store information on master errors so handler can detect and clean
- * up the bus
- */
-static void fsi_master_gpio_error(struct fsi_master_gpio *master, int error)
-{
-
-}
-
-/*
* Note: callers rely specifically on this returning -EAGAIN for
* a CRC error detected in the response. Use other error code
* for other situations. It will be converted to something else
@@ -396,7 +380,6 @@ static int read_one_response(struct fsi_master_gpio *master,
if (i == FSI_GPIO_MTOE_COUNT) {
dev_dbg(master->dev,
"Master time out waiting for response\n");
- fsi_master_gpio_error(master, FSI_GPIO_MTOE);
spin_unlock_irqrestore(&master->bit_lock, flags);
return -ETIMEDOUT;
}
@@ -422,8 +405,11 @@ static int read_one_response(struct fsi_master_gpio *master,
crc = crc4(0, 1, 1);
crc = crc4(crc, msg.msg, msg.bits);
if (crc) {
- dev_dbg(master->dev, "ERR response CRC\n");
- fsi_master_gpio_error(master, FSI_GPIO_CRC_INVAL);
+ /* Check if it's all 1's, that probably means the host is off */
+ if (((~msg.msg) & ((1ull << msg.bits) - 1)) == 0)
+ return -ENODEV;
+ dev_dbg(master->dev, "ERR response CRC msg: 0x%016llx (%d bits)\n",
+ msg.msg, msg.bits);
return -EAGAIN;
}
@@ -538,12 +524,10 @@ retry:
case FSI_GPIO_RESP_ERRA:
dev_dbg(master->dev, "ERRA received: 0x%x\n", (int)response.msg);
- fsi_master_gpio_error(master, response.msg);
rc = -EIO;
break;
case FSI_GPIO_RESP_ERRC:
dev_dbg(master->dev, "ERRC received: 0x%x\n", (int)response.msg);
- fsi_master_gpio_error(master, response.msg);
trace_fsi_master_gpio_crc_cmd_error(master);
rc = -EAGAIN;
break;