From 84b00f0e2878e6b7dbfa346d496d564aa55c6175 Mon Sep 17 00:00:00 2001 From: Jon Hunter Date: Wed, 6 Mar 2013 14:36:47 -0600 Subject: [PATCH] ARM: OMAP2+: Allow GPMC probe to complete even if CS mapping fails When the GPMC driver is probed, we call gpmc_mem_init() to see which chip-selects have already been configured and enabled by the boot-loader and allocate space for them. If we fail to allocate space for one chip-select, then we return failure from the probe and the GPMC driver will not be available. Rather than render the GPMC useless for all GPMC devices, if we fail to allocate space for one chip-select print a warning and disable the chip-select. This way other GPMC clients can still be used. There is no downside to this approach, because all GPMC clients need to request a chip-select before they can use the GPMC and on requesting a chip-select, if memory has not already been reserved for the chip-select then it will be. Signed-off-by: Jon Hunter Tested-by: Ezequiel Garcia --- arch/arm/mach-omap2/gpmc.c | 24 +++++++----------------- 1 file changed, 7 insertions(+), 17 deletions(-) diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c index a259dc0..5f6af20 100644 --- a/arch/arm/mach-omap2/gpmc.c +++ b/arch/arm/mach-omap2/gpmc.c @@ -785,9 +785,9 @@ static void gpmc_mem_exit(void) } -static int gpmc_mem_init(void) +static void gpmc_mem_init(void) { - int cs, rc; + int cs; /* * The first 1MB of GPMC address space is typically mapped to @@ -804,16 +804,12 @@ static int gpmc_mem_init(void) if (!gpmc_cs_mem_enabled(cs)) continue; gpmc_cs_get_memconf(cs, &base, &size); - rc = gpmc_cs_insert_mem(cs, base, size); - if (rc < 0) { - while (--cs >= 0) - if (gpmc_cs_mem_enabled(cs)) - gpmc_cs_delete_mem(cs); - return rc; + if (gpmc_cs_insert_mem(cs, base, size)) { + pr_warn("%s: disabling cs %d mapped at 0x%x-0x%x\n", + __func__, cs, base, base + size); + gpmc_cs_disable_mem(cs); } } - - return 0; } static u32 gpmc_round_ps_to_sync_clk(u32 time_ps, u32 sync_clk) @@ -1611,13 +1607,7 @@ static int gpmc_probe(struct platform_device *pdev) dev_info(gpmc_dev, "GPMC revision %d.%d\n", GPMC_REVISION_MAJOR(l), GPMC_REVISION_MINOR(l)); - rc = gpmc_mem_init(); - if (rc < 0) { - clk_disable_unprepare(gpmc_l3_clk); - clk_put(gpmc_l3_clk); - dev_err(gpmc_dev, "failed to reserve memory\n"); - return rc; - } + gpmc_mem_init(); if (gpmc_setup_irq() < 0) dev_warn(gpmc_dev, "gpmc_setup_irq failed\n"); -- 2.7.4