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Wed, 10 Feb 2021 20:46:19 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 11AKkHBQ20971902 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 10 Feb 2021 20:46:17 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BE74C78060; Wed, 10 Feb 2021 20:46:17 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 836817805F; Wed, 10 Feb 2021 20:46:17 +0000 (GMT) Received: from v0005c16.aus.stglabs.ibm.com (unknown [9.163.70.250]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 10 Feb 2021 20:46:17 +0000 (GMT) From: Eddie James To: openbmc@lists.ozlabs.org Subject: [PATCH linux dev-5.8] fsi: aspeed: Set poll timeout based on clock divider Date: Wed, 10 Feb 2021 14:46:13 -0600 Message-Id: <20210210204613.49560-1-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.737 definitions=2021-02-10_10:2021-02-10, 2021-02-10 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 clxscore=1011 priorityscore=1501 phishscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102100178 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eddie James Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" The timeout for polling for transfer acknowledgment on the OPB was very long, occasionally resulting in scheduling problems. Instead, use a timeout based on the clock divider specified with the module parameter. In benchmarking, the worst case poll times didn't increase significantly with increased divider until it reached 16 and higher. The average poll time increased linearly with the divider. div 1: max:150us avg: 2us div 2: max:155us avg: 3us div 4: max:149us avg: 7us div 8: max:153us avg:13us div 16: max:197us avg:21us div 32: max:181us avg:50us div 64: max:262us avg:100us Signed-off-by: Eddie James --- drivers/fsi/fsi-master-aspeed.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index c71d7e9a32b0..13f7e07beacc 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -25,6 +25,7 @@ struct fsi_master_aspeed { void __iomem *base; struct clk *clk; struct gpio_desc *cfam_reset_gpio; + int timeout_us; }; #define to_fsi_master_aspeed(m) \ @@ -92,8 +93,6 @@ static const u32 fsi_base = 0xa0000000; static u16 aspeed_fsi_divisor = FSI_DIVISOR_DEFAULT; module_param_named(bus_div,aspeed_fsi_divisor, ushort, 0); -#define OPB_POLL_TIMEOUT 10000 - static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr, u32 val, u32 transfer_size) { @@ -110,7 +109,7 @@ static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr, ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg, (reg & OPB0_XFER_ACK_EN) != 0, - 0, OPB_POLL_TIMEOUT); + 0, aspeed->timeout_us); status = readl(base + OPB0_STATUS); @@ -157,7 +156,7 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr, ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg, (reg & OPB0_XFER_ACK_EN) != 0, - 0, OPB_POLL_TIMEOUT); + 0, aspeed->timeout_us); status = readl(base + OPB0_STATUS); @@ -609,6 +608,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, aspeed); mutex_init(&aspeed->lock); + aspeed->timeout_us = min(10000, max(1, aspeed_fsi_divisor / 8) * 300); aspeed_master_init(aspeed); rc = fsi_master_register(&aspeed->master); -- 2.27.0